diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 0884d5355d0db512b17680562b0b398d3e275d93..f1fdf8e8a0f0bd9e50e70408a00e0c157735d9ee 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -17,6 +17,8 @@ variables:
   CARGO_TARGET_DIR:                "/ci-cache/${CI_PROJECT_NAME}/targets/${CI_COMMIT_REF_NAME}/${CI_JOB_NAME}"
   CI_SERVER_NAME:                  "GitLab CI"
   REGISTRY:                        registry.parity.io/parity/infrastructure/scripts
+  RUSTUP_TOOLCHAIN:                nightly
+  RUST_LIB_BACKTRACE:              0
 
 .collect-artifacts:                &collect-artifacts
   artifacts:
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000000000000000000000000000000000000..38923c682e3ed536096a4697446c9f6ba7a54fb4
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,8 @@
+# Version 0.4.0 (2020-02-26)
+
+- Minimize contract wasm binary size:
+  - Uses [`cargo-xbuild`](https://github.com/rust-osdev/cargo-xbuild) to build custom sysroot crates without panic string
+bloat.
+  - Automatically removes the `rlib` crate type from `Cargo.toml`, removing redundant metadata.
+- Removes requirement for linker args specified in `.cargo/config`.
+- Added `--verbose` and `--quiet` flags for `build` and `generate-metadata` commands.
diff --git a/Cargo.lock b/Cargo.lock
index cb94e86fed16bc9aeed458fe58b7ddd897713162..5551e7e9d7963587da8872db935685cdc8f9afec 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -27,10 +27,10 @@ dependencies = [
 
 [[package]]
 name = "aho-corasick"
-version = "0.7.7"
+version = "0.7.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "memchr 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -74,16 +74,16 @@ name = "async-std"
 version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "async-task 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-channel 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-deque 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "async-task 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-channel 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-deque 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-io 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-timer 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kv-log-macro 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -95,10 +95,10 @@ dependencies = [
 
 [[package]]
 name = "async-task"
-version = "1.3.0"
+version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -109,7 +109,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustls 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "webpki 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "webpki 0.21.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "webpki-roots 0.17.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -118,8 +118,8 @@ name = "atty"
 version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "hermit-abi 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hermit-abi 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -135,12 +135,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "backtrace"
-version = "0.3.43"
+version = "0.3.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "backtrace-sys 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -150,7 +150,7 @@ version = "0.1.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -163,7 +163,7 @@ name = "base64"
 version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -202,7 +202,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "block-padding 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "byte-tools 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "generic-array 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -221,15 +221,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bstr"
-version = "0.2.10"
+version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "memchr 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "bumpalo"
-version = "3.1.2"
+version = "3.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -244,7 +244,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "byteorder"
-version = "1.3.2"
+version = "1.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -262,25 +262,29 @@ dependencies = [
 
 [[package]]
 name = "cargo-contract"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "anyhow 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "assert_matches 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "async-std 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cargo-xbuild 0.5.28 (registry+https://github.com/rust-lang/crates.io-index)",
  "cargo_metadata 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "colored 1.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "colored 1.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-wasm 0.41.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pwasm-utils 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "sp-core 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sp-core 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
  "structopt 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "substrate-subxt 0.4.0 (git+https://github.com/paritytech/substrate-subxt/?rev=b7565ff435b9499ca1ff4dad519009e94a13111c)",
  "tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "toml 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "wabt 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "walkdir 2.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -288,6 +292,24 @@ dependencies = [
  "zip 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "cargo-xbuild"
+version = "0.5.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cargo_metadata 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fs2 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "toml 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "walkdir 2.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "cargo_metadata"
 version = "0.9.1"
@@ -349,7 +371,7 @@ dependencies = [
 
 [[package]]
 name = "colored"
-version = "1.9.2"
+version = "1.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "atty 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -390,40 +412,43 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-channel"
-version = "0.4.0"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-utils 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "maybe-uninit 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam-deque"
-version = "0.7.2"
+version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-epoch 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-epoch 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "maybe-uninit 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.8.0"
+version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "maybe-uninit 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memoffset 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "scopeguard 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam-utils"
-version = "0.7.0"
+version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -447,7 +472,7 @@ name = "curve25519-dalek"
 version = "1.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "clear_on_drop 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "digest 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -459,7 +484,7 @@ name = "curve25519-dalek"
 version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "digest 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "subtle 2.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -468,12 +493,12 @@ dependencies = [
 
 [[package]]
 name = "derive_more"
-version = "0.99.2"
+version = "0.99.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -512,12 +537,20 @@ name = "environmental"
 version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "error-chain"
+version = "0.12.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "version_check 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "failure"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.44 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure_derive 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -526,9 +559,9 @@ name = "failure_derive"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -542,8 +575,8 @@ name = "fixed-hash"
 version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "static_assertions 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -556,86 +589,95 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "frame-metadata"
-version = "11.0.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
+version = "11.0.0-dev"
+source = "git+https://github.com/paritytech/substrate/#71d10b4564d1ffcb74ee8058c76d7f279a8a3842"
 dependencies = [
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
- "sp-core 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-core 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
 ]
 
 [[package]]
 name = "frame-support"
-version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
+version = "2.0.0-dev"
+source = "git+https://github.com/paritytech/substrate/#71d10b4564d1ffcb74ee8058c76d7f279a8a3842"
 dependencies = [
  "bitmask 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "frame-metadata 11.0.0 (git+https://github.com/paritytech/substrate/)",
- "frame-support-procedural 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "frame-metadata 11.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "frame-support-procedural 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
  "impl-trait-for-tuples 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "once_cell 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "paste 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "paste 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
- "sp-arithmetic 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-core 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-inherents 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-io 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-runtime 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-state-machine 0.8.0 (git+https://github.com/paritytech/substrate/)",
- "sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-arithmetic 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-core 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-inherents 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-io 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-runtime 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-state-machine 0.8.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
  "tracing 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "frame-support-procedural"
-version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
+version = "2.0.0-dev"
+source = "git+https://github.com/paritytech/substrate/#71d10b4564d1ffcb74ee8058c76d7f279a8a3842"
 dependencies = [
- "frame-support-procedural-tools 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "frame-support-procedural-tools 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "frame-support-procedural-tools"
-version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
+version = "2.0.0-dev"
+source = "git+https://github.com/paritytech/substrate/#71d10b4564d1ffcb74ee8058c76d7f279a8a3842"
 dependencies = [
- "frame-support-procedural-tools-derive 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "frame-support-procedural-tools-derive 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
  "proc-macro-crate 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "frame-support-procedural-tools-derive"
-version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
+version = "2.0.0-dev"
+source = "git+https://github.com/paritytech/substrate/#71d10b4564d1ffcb74ee8058c76d7f279a8a3842"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "frame-system"
-version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
+version = "2.0.0-dev"
+source = "git+https://github.com/paritytech/substrate/#71d10b4564d1ffcb74ee8058c76d7f279a8a3842"
 dependencies = [
- "frame-support 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "frame-support 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
  "impl-trait-for-tuples 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
- "sp-core 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-io 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-runtime 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-version 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-core 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-io 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-runtime 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-version 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+]
+
+[[package]]
+name = "fs2"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -706,9 +748,9 @@ version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -742,7 +784,7 @@ dependencies = [
  "futures-macro 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-sink 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-task 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "pin-utils 0.1.0-alpha.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro-nested 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -763,7 +805,7 @@ version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasi 0.9.0+wasi-snapshot-preview1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -777,8 +819,8 @@ name = "globset"
 version = "0.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "aho-corasick 0.7.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "bstr 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "aho-corasick 0.7.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bstr 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -795,7 +837,7 @@ dependencies = [
  "futures-sink 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-util 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "indexmap 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "indexmap 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -843,15 +885,15 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.6"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "hex"
-version = "0.4.0"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -977,14 +1019,14 @@ name = "impl-trait-for-tuples"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "indexmap"
-version = "1.3.1"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1000,7 +1042,7 @@ name = "iovec"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1019,7 +1061,7 @@ dependencies = [
 [[package]]
 name = "jsonrpsee"
 version = "1.0.0"
-source = "git+https://github.com/paritytech/jsonrpsee/#0486b10c68423264ec159f239713460641df688d"
+source = "git+https://github.com/paritytech/jsonrpsee/#f0f9d4b23ec7694f4de1a360200d9887bf31436d"
 dependencies = [
  "async-std 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1029,13 +1071,13 @@ dependencies = [
  "jsonrpsee-ws 1.0.0 (git+https://github.com/paritytech/jsonrpsee/)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "thiserror 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thiserror 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "jsonrpsee-core"
 version = "1.0.0"
-source = "git+https://github.com/paritytech/jsonrpsee/#0486b10c68423264ec159f239713460641df688d"
+source = "git+https://github.com/paritytech/jsonrpsee/#f0f9d4b23ec7694f4de1a360200d9887bf31436d"
 dependencies = [
  "bs58 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1051,7 +1093,7 @@ dependencies = [
 [[package]]
 name = "jsonrpsee-http"
 version = "1.0.0"
-source = "git+https://github.com/paritytech/jsonrpsee/#0486b10c68423264ec159f239713460641df688d"
+source = "git+https://github.com/paritytech/jsonrpsee/#f0f9d4b23ec7694f4de1a360200d9887bf31436d"
 dependencies = [
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1062,7 +1104,7 @@ dependencies = [
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.48 (registry+https://github.com/rust-lang/crates.io-index)",
- "thiserror 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thiserror 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicase 2.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1070,18 +1112,18 @@ dependencies = [
 [[package]]
 name = "jsonrpsee-proc-macros"
 version = "1.0.0"
-source = "git+https://github.com/paritytech/jsonrpsee/#0486b10c68423264ec159f239713460641df688d"
+source = "git+https://github.com/paritytech/jsonrpsee/#f0f9d4b23ec7694f4de1a360200d9887bf31436d"
 dependencies = [
  "Inflector 0.11.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "jsonrpsee-server-utils"
 version = "1.0.0"
-source = "git+https://github.com/paritytech/jsonrpsee/#0486b10c68423264ec159f239713460641df688d"
+source = "git+https://github.com/paritytech/jsonrpsee/#f0f9d4b23ec7694f4de1a360200d9887bf31436d"
 dependencies = [
  "globset 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.13.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1093,7 +1135,7 @@ dependencies = [
 [[package]]
 name = "jsonrpsee-ws"
 version = "1.0.0"
-source = "git+https://github.com/paritytech/jsonrpsee/#0486b10c68423264ec159f239713460641df688d"
+source = "git+https://github.com/paritytech/jsonrpsee/#f0f9d4b23ec7694f4de1a360200d9887bf31436d"
 dependencies = [
  "async-std 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "async-tls 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1109,9 +1151,9 @@ dependencies = [
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.48 (registry+https://github.com/rust-lang/crates.io-index)",
  "soketto 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "thiserror 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thiserror 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "webpki 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "webpki 0.21.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1143,7 +1185,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.66"
+version = "0.2.67"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1166,7 +1208,7 @@ name = "lock_api"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "scopeguard 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1189,7 +1231,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "memchr"
-version = "2.3.0"
+version = "2.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1221,7 +1263,7 @@ name = "merlin"
 version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "zeroize 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1237,7 +1279,7 @@ dependencies = [
  "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1251,7 +1293,7 @@ version = "0.6.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1272,7 +1314,7 @@ version = "0.2.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1286,7 +1328,7 @@ name = "nom"
 version = "4.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "memchr 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1333,8 +1375,8 @@ name = "num_cpus"
 version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "hermit-abi 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hermit-abi 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1352,18 +1394,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "pallet-indices"
-version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
+version = "2.0.0-dev"
+source = "git+https://github.com/paritytech/substrate/#71d10b4564d1ffcb74ee8058c76d7f279a8a3842"
 dependencies = [
- "frame-support 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "frame-system 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "frame-support 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "frame-system 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
- "sp-core 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-io 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-keyring 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-runtime 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-core 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-io 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-keyring 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-runtime 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
 ]
 
 [[package]]
@@ -1384,9 +1426,9 @@ version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro-crate 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1407,8 +1449,8 @@ name = "parity-util-mem-derive"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1443,7 +1485,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1457,7 +1499,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1465,22 +1507,22 @@ dependencies = [
 
 [[package]]
 name = "paste"
-version = "0.1.6"
+version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "paste-impl 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "paste-impl 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "paste-impl"
-version = "0.1.6"
+version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1488,7 +1530,7 @@ name = "pbkdf2"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "crypto-mac 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1515,9 +1557,9 @@ name = "pin-project-internal"
 version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1561,25 +1603,25 @@ dependencies = [
 
 [[package]]
 name = "proc-macro-error"
-version = "0.4.8"
+version = "0.4.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro-error-attr 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-error-attr 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustversion 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "proc-macro-error-attr"
-version = "0.4.8"
+version = "0.4.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustversion 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "syn-mid 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1588,9 +1630,9 @@ name = "proc-macro-hack"
 version = "0.5.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1600,7 +1642,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.8"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1611,7 +1653,7 @@ name = "pwasm-utils"
 version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-wasm 0.41.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1626,7 +1668,19 @@ name = "quote"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1635,7 +1689,7 @@ version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1653,7 +1707,7 @@ version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "getrandom 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_chacha 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_hc 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1727,7 +1781,7 @@ name = "rand_jitter"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1739,7 +1793,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1780,8 +1834,8 @@ name = "regex"
 version = "1.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "aho-corasick 0.7.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "aho-corasick 0.7.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex-syntax 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread_local 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1801,12 +1855,12 @@ dependencies = [
 
 [[package]]
 name = "ring"
-version = "0.16.9"
+version = "0.16.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "spin 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "web-sys 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1843,9 +1897,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "ring 0.16.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.16.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "sct 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "webpki 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "webpki 0.21.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1853,9 +1907,9 @@ name = "rustversion"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1889,7 +1943,7 @@ dependencies = [
 
 [[package]]
 name = "scopeguard"
-version = "1.0.0"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1897,7 +1951,7 @@ name = "sct"
 version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "ring 0.16.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.16.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1928,9 +1982,9 @@ name = "serde_derive"
 version = "1.0.104"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1992,7 +2046,7 @@ dependencies = [
  "sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "static_assertions 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "thiserror 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thiserror 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2002,68 +2056,68 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "sp-api"
-version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
+version = "2.0.0-dev"
+source = "git+https://github.com/paritytech/substrate/#71d10b4564d1ffcb74ee8058c76d7f279a8a3842"
 dependencies = [
  "hash-db 0.15.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "sp-api-proc-macro 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-core 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-runtime 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-state-machine 0.8.0 (git+https://github.com/paritytech/substrate/)",
- "sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-version 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-api-proc-macro 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-core 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-runtime 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-state-machine 0.8.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-version 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
 ]
 
 [[package]]
 name = "sp-api-proc-macro"
-version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
+version = "2.0.0-dev"
+source = "git+https://github.com/paritytech/substrate/#71d10b4564d1ffcb74ee8058c76d7f279a8a3842"
 dependencies = [
  "blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro-crate 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "sp-application-crypto"
-version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
+version = "2.0.0-dev"
+source = "git+https://github.com/paritytech/substrate/#71d10b4564d1ffcb74ee8058c76d7f279a8a3842"
 dependencies = [
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
- "sp-core 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-io 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-core 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-io 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
 ]
 
 [[package]]
 name = "sp-arithmetic"
-version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
+version = "2.0.0-dev"
+source = "git+https://github.com/paritytech/substrate/#71d10b4564d1ffcb74ee8058c76d7f279a8a3842"
 dependencies = [
  "integer-sqrt 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
- "sp-debug-derive 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-debug-derive 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
 ]
 
 [[package]]
 name = "sp-core"
-version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
+version = "2.0.0-dev"
+source = "git+https://github.com/paritytech/substrate/#71d10b4564d1ffcb74ee8058c76d7f279a8a3842"
 dependencies = [
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- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
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- "hex 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
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- "sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-storage 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-debug-derive 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-externalities 0.8.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-runtime-interface 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-storage 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
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@@ -2094,133 +2148,133 @@ dependencies = [
 
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 dependencies = [
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- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
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-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
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- "sp-storage 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
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+ "sp-trie 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
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- "sp-runtime 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-core 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-runtime 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
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- "sp-core 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-core 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
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- "sp-io 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-application-crypto 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-arithmetic 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-core 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-inherents 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-io 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
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- "sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-wasm-interface 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-externalities 0.8.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-runtime-interface-proc-macro 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-wasm-interface 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
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- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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-version = "0.8.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
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 dependencies = [
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@@ -2228,78 +2282,78 @@ dependencies = [
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- "sp-externalities 0.8.0 (git+https://github.com/paritytech/substrate/)",
- "sp-panic-handler 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-trie 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-core 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-externalities 0.8.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-panic-handler 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-trie 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
  "trie-db 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
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-version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
+version = "2.0.0-dev"
+source = "git+https://github.com/paritytech/substrate/#71d10b4564d1ffcb74ee8058c76d7f279a8a3842"
 
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- "sp-debug-derive 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-debug-derive 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
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-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
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 dependencies = [
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- "sp-api 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-runtime 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-api 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
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- "sp-core 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-core 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
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 [[package]]
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-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
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- "sp-runtime 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-runtime 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
 ]
 
 [[package]]
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-version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate/#d43b9f3ff94eb1f914ef77b00489bb42e5e40424"
+version = "2.0.0-dev"
+source = "git+https://github.com/paritytech/substrate/#71d10b4564d1ffcb74ee8058c76d7f279a8a3842"
 dependencies = [
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- "sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
  "wasmi 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -2334,10 +2388,10 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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- "proc-macro-error 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-error 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2354,9 +2408,9 @@ version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2375,23 +2429,23 @@ name = "substrate-subxt"
 version = "0.4.0"
 source = "git+https://github.com/paritytech/substrate-subxt/?rev=b7565ff435b9499ca1ff4dad519009e94a13111c#b7565ff435b9499ca1ff4dad519009e94a13111c"
 dependencies = [
- "frame-metadata 11.0.0 (git+https://github.com/paritytech/substrate/)",
- "frame-support 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "frame-metadata 11.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "frame-support 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
  "futures 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpsee 1.0.0 (git+https://github.com/paritytech/jsonrpsee/)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "pallet-indices 2.0.0 (git+https://github.com/paritytech/substrate/)",
+ "pallet-indices 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.48 (registry+https://github.com/rust-lang/crates.io-index)",
- "sp-core 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-rpc 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-runtime 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-transaction-pool 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "sp-version 2.0.0 (git+https://github.com/paritytech/substrate/)",
- "thiserror 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sp-core 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-rpc 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-runtime 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-transaction-pool 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "sp-version 2.0.0-dev (git+https://github.com/paritytech/substrate/)",
+ "thiserror 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2407,10 +2461,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "syn"
-version = "1.0.14"
+version = "1.0.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2420,9 +2474,9 @@ name = "syn-mid"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2430,19 +2484,28 @@ name = "synstructure"
 version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tempdir"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "remove_dir_all 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tempfile"
 version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "remove_dir_all 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2467,20 +2530,20 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.10"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "thiserror-impl 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thiserror-impl 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.10"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2496,7 +2559,7 @@ name = "time"
 version = "0.1.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2532,7 +2595,7 @@ dependencies = [
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "pin-project-lite 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2571,7 +2634,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "tracing-attributes 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "tracing-core 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tracing-core 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2580,12 +2643,12 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "tracing-core"
-version = "0.1.9"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2634,7 +2697,7 @@ name = "uint"
 version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "crunchy 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "static_assertions 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2778,12 +2841,12 @@ name = "wasm-bindgen-backend"
 version = "0.2.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bumpalo 3.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bumpalo 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-shared 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2801,9 +2864,9 @@ name = "wasm-bindgen-macro-support"
 version = "0.2.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-backend 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-shared 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2821,9 +2884,9 @@ dependencies = [
  "anyhow 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-backend 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)",
  "weedle 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2833,7 +2896,7 @@ name = "wasmi"
 version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "memory_units 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-rational 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2863,10 +2926,10 @@ dependencies = [
 
 [[package]]
 name = "webpki"
-version = "0.21.0"
+version = "0.21.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "ring 0.16.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.16.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2875,7 +2938,7 @@ name = "webpki-roots"
 version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "webpki 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "webpki 0.21.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2892,7 +2955,7 @@ version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "failure 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2959,9 +3022,9 @@ name = "zeroize_derive"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2978,7 +3041,7 @@ dependencies = [
 "checksum Inflector 0.11.4 (registry+https://github.com/rust-lang/crates.io-index)" = "fe438c63458706e03479442743baae6c88256498e6431708f6dfc520a26515d3"
 "checksum ahash 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "6f33b5018f120946c1dcf279194f238a9f146725593ead1c08fa47ff22b0b5d3"
 "checksum ahash 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "0989268a37e128d4d7a8028f1c60099430113fdbc70419010601ce51a228e4fe"
-"checksum aho-corasick 0.7.7 (registry+https://github.com/rust-lang/crates.io-index)" = "5f56c476256dc249def911d6f7580b5fc7e875895b5d7ee88f5d602208035744"
+"checksum aho-corasick 0.7.8 (registry+https://github.com/rust-lang/crates.io-index)" = "743ad5a418686aad3b87fd14c43badd828cf26e214a00f92a384291cf22e1811"
 "checksum ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
 "checksum anyhow 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)" = "7825f6833612eb2414095684fcf6c635becf3ce97fe48cf6421321e93bfbd53c"
 "checksum arrayref 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "a4c527152e37cf757a3f78aae5a06fbeefdb07ccc535c980a3208ee3060dd544"
@@ -2986,12 +3049,12 @@ dependencies = [
 "checksum arrayvec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cff77d8686867eceff3105329d4698d96c2391c176d5d03adc90c7389162b5b8"
 "checksum assert_matches 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7deb0a829ca7bcfaf5da70b073a8d128619259a7be8216a355e23f00763059e5"
 "checksum async-std 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "538ecb01eb64eecd772087e5b6f7540cbc917f047727339a472dafed2185b267"
-"checksum async-task 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f20c6fda19d0fc02406779587ca4f9a4171cd32e4a5bda0bd016f0a1334c8d4a"
+"checksum async-task 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0ac2c016b079e771204030951c366db398864f5026f84a44dafb0ff20f02085d"
 "checksum async-tls 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "6ce6977f57fa68da77ffe5542950d47e9c23d65f5bc7cb0a9f8700996913eec7"
 "checksum atty 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)" = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
 "checksum autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "1d49d90015b3c36167a20fe2810c5cd875ad504b39cff3d4eae7977e6b7c1cb2"
 "checksum autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f8aac770f1885fd7e387acedd76065302551364496e46b3dd00860b2f8359b9d"
-"checksum backtrace 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)" = "7f80256bc78f67e7df7e36d77366f636ed976895d91fe2ab9efa3973e8fe8c4f"
+"checksum backtrace 0.3.44 (registry+https://github.com/rust-lang/crates.io-index)" = "e4036b9bf40f3cf16aba72a3d65e8a520fc4bafcdc7079aea8f848c58c5b5536"
 "checksum backtrace-sys 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)" = "5d6575f128516de27e3ce99689419835fce9643a9b215a14d2b5b685be018491"
 "checksum base58 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5024ee8015f02155eee35c711107ddd9a9bf3cb689cf2a9089c97e79b6e1ae83"
 "checksum base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0b25d992356d2eb0ed82172f5248873db5560c4721f564b13cb5193bda5e668e"
@@ -3003,13 +3066,14 @@ dependencies = [
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 "checksum block-padding 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "fa79dedbb091f449f1f39e53edf88d5dbe95f895dae6135a8d7b881fb5af73f5"
 "checksum bs58 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b170cd256a3f9fa6b9edae3e44a7dfdfc77e8124dbc3e2612d75f9c3e2396dae"
-"checksum bstr 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "fe8a65814ca90dfc9705af76bb6ba3c6e2534489a72270e797e603783bb4990b"
-"checksum bumpalo 3.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "5fb8038c1ddc0a5f73787b130f4cc75151e96ed33e417fde765eb5a81e3532f4"
+"checksum bstr 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "502ae1441a0a5adb8fbd38a5955a6416b9493e92b465de5e4a9bde6a539c2c48"
+"checksum bumpalo 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1f359dc14ff8911330a51ef78022d376f25ed00248912803b58f00cb1c27f742"
 "checksum byte-slice-cast 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "b0a5e3906bcbf133e33c1d4d95afc664ad37fbdb9f6568d8043e7ea8c27d93d3"
 "checksum byte-tools 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e3b5ca7a04898ad4bcd41c90c5285445ff5b791899bb1b0abdd2a2aa791211d7"
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+"checksum proc-macro-error-attr 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)" = "d175bef481c7902e63e3165627123fff3502f06ac043d3ef42d08c1246da9253"
 "checksum proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)" = "ecd45702f76d6d3c75a80564378ae228a85f0b59d2f3ed43c91b4a69eb2ebfc5"
 "checksum proc-macro-nested 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "369a6ed065f249a159e06c45752c780bda2fb53c995718f9e484d08daa9eb42e"
-"checksum proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)" = "3acb317c6ff86a4e579dfa00fc5e6cca91ecbb4e7eb2df0468805b674eb88548"
+"checksum proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)" = "6c09721c6781493a2a492a96b5a5bf19b65917fe6728884e7c44dd0c60ca3435"
 "checksum pwasm-utils 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4f7a12f176deee919f4ba55326ee17491c8b707d0987aed822682c821b660192"
 "checksum quick-error 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
 "checksum quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "053a8c8bcc71fcce321828dc897a98ab9760bef03a4fc36693c231e5b3216cfe"
+"checksum rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "552840b97013b1a26992c11eac34bdd778e464601a4c2054b5f0bff7c6761293"
 "checksum rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)" = "6d71dacdc3c88c1fde3885a3be3fbab9f35724e6ce99467f7d9c5026132184ca"
 "checksum rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
 "checksum rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "556d3a1ca6600bfcbab7c7c91ccb085ac7fbbcd70e008a98742e7847f4f7bcef"
@@ -3174,7 +3241,7 @@ dependencies = [
 "checksum regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "322cf97724bea3ee221b78fe25ac9c46114ebb51747ad5babd51a2fc6a8235a8"
 "checksum regex-syntax 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)" = "b28dfe3fe9badec5dbf0a79a9cccad2cfc2ab5484bdb3e44cbd1ae8b3ba2be06"
 "checksum remove_dir_all 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "4a83fa3702a688b9359eccba92d153ac33fd2e8462f9e0e3fdf155239ea7792e"
-"checksum ring 0.16.9 (registry+https://github.com/rust-lang/crates.io-index)" = "6747f8da1f2b1fabbee1aaa4eb8a11abf9adef0bf58a41cee45db5d59cecdfac"
+"checksum ring 0.16.11 (registry+https://github.com/rust-lang/crates.io-index)" = "741ba1704ae21999c00942f9f5944f801e977f54302af346b596287599ad1862"
 "checksum rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "4c691c0e608126e00913e33f0ccf3727d5fc84573623b8d65b2df340b5201783"
 "checksum rustc-hash 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
 "checksum rustc-hex 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3e75f6a532d0fd9f7f13144f392b6ad56a32696bfcd9c78f797f16bbb6f072d6"
@@ -3184,7 +3251,7 @@ dependencies = [
 "checksum ryu 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "bfa8506c1de11c9c4e4c38863ccbe02a305c8188e85a05a784c9e11e1c3910c8"
 "checksum same-file 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
 "checksum schnorrkel 0.8.5 (registry+https://github.com/rust-lang/crates.io-index)" = "eacd8381b3c37840c9c9f40472af529e49975bdcbc24f83c31059fd6539023d3"
-"checksum scopeguard 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b42e15e59b18a828bbf5c58ea01debb36b9b096346de35d941dcb89009f24a0d"
+"checksum scopeguard 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 "checksum sct 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e3042af939fca8c3453b7af0f1c66e533a15a86169e39de2657310ade8f98d3c"
 "checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
 "checksum semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
@@ -3198,28 +3265,28 @@ dependencies = [
 "checksum smallvec 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5c2fb2ec9bcd216a5b0d0ccf31ab17b5ed1d627960edff65bbe95d3ce221cefc"
 "checksum soketto 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1c9dab3f95c9ebdf3a88268c19af668f637a3c5039c2c56ff2d40b1b2d64a25b"
 "checksum sourcefile 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4bf77cb82ba8453b42b6ae1d692e4cdc92f9a47beaf89a847c8be83f4e328ad3"
-"checksum sp-api 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-api-proc-macro 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-application-crypto 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-arithmetic 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-core 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-debug-derive 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-externalities 0.8.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-inherents 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-io 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-keyring 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-panic-handler 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-rpc 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-runtime 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-runtime-interface 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-runtime-interface-proc-macro 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-state-machine 0.8.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-std 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-storage 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-transaction-pool 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-trie 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-version 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
-"checksum sp-wasm-interface 2.0.0 (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-api 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-api-proc-macro 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-application-crypto 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-arithmetic 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-core 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-debug-derive 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-externalities 0.8.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-inherents 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-io 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-keyring 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-panic-handler 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-rpc 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-runtime 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-runtime-interface 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-runtime-interface-proc-macro 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-state-machine 0.8.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-std 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-storage 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-transaction-pool 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-trie 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-version 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
+"checksum sp-wasm-interface 2.0.0-dev (git+https://github.com/paritytech/substrate/)" = "<none>"
 "checksum spin 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
 "checksum static_assertions 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
@@ -3231,14 +3298,15 @@ dependencies = [
 "checksum substrate-subxt 0.4.0 (git+https://github.com/paritytech/substrate-subxt/?rev=b7565ff435b9499ca1ff4dad519009e94a13111c)" = "<none>"
 "checksum subtle 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2d67a5a62ba6e01cb2192ff309324cb4875d0c451d55fe2319433abe7a05a8ee"
 "checksum subtle 2.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7c65d530b10ccaeac294f349038a597e435b18fb456aadd0840a623f83b9e941"
-"checksum syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)" = "af6f3550d8dff9ef7dc34d384ac6f107e5d31c8f57d9f28e0081503f547ac8f5"
+"checksum syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)" = "123bd9499cfb380418d509322d7a6d52e5315f064fe4b3ad18a53d6b92c07859"
 "checksum syn-mid 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7be3539f6c128a931cf19dcee741c1af532c7fd387baa739c03dd2e96479338a"
 "checksum synstructure 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)" = "67656ea1dc1b41b1451851562ea232ec2e5a80242139f7e679ceccfb5d61f545"
+"checksum tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
 "checksum tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
 "checksum termcolor 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb6bfa289a4d7c5766392812c0a1f4c1ba45afa1ad47803c11e1f407d846d75f"
 "checksum textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
-"checksum thiserror 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)" = "205684fd018ca14432b12cce6ea3d46763311a571c3d294e71ba3f01adcf1aad"
-"checksum thiserror-impl 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)" = "57e4d2e50ca050ed44fb58309bdce3efa79948f84f9993ad1978de5eebdce5a7"
+"checksum thiserror 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)" = "ee14bf8e6767ab4c687c9e8bc003879e042a96fd67a3ba5934eadb6536bef4db"
+"checksum thiserror-impl 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)" = "a7b51e1fbc44b5a0840be594fbc0f960be09050f2617e61e6aa43bef97cd3ef4"
 "checksum thread_local 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
 "checksum time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "db8dcfca086c1143c9270ac42a2bbd8a7ee477b78ac8e45b19abfb0cbede4b6f"
 "checksum tiny-bip39 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1cd1fb03fe8e07d17cd851a624a9fff74642a997b67fbd1ccd77533241640d92"
@@ -3249,7 +3317,7 @@ dependencies = [
 "checksum tower-service 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e987b6bf443f4b5b3b6f38704195592cca41c5bb7aedd3c3693c7081f8289860"
 "checksum tracing 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "1e213bd24252abeb86a0b7060e02df677d367ce6cb772cef17e9214b8390a8d3"
 "checksum tracing-attributes 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "04cfd395def5a60236e187e1ff905cb55668a59f29928dec05e6e1b1fd2ac1f3"
-"checksum tracing-core 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "13a46f11e372b8bd4b4398ea54353412fdd7fd42a8370c7e543e218cf7661978"
+"checksum tracing-core 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "0aa83a9a47081cd522c09c81b31aec2c9273424976f922ad61c053b58350b715"
 "checksum trie-db 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)" = "de9222c50cc325855621271157c973da27a0dcd26fa06f8edf81020bd2333df0"
 "checksum trie-root 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)" = "652931506d2c1244d7217a70b99f56718a7b4161b37f04e7cd868072a99f68cd"
 "checksum try-lock 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e604eb7b43c06650e854be16a2a03155743d3752dd1c943f6829e26b7a36e382"
@@ -3282,7 +3350,7 @@ dependencies = [
 "checksum wasmi 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "bf617d864d25af3587aa745529f7aaa541066c876d57e050c0d0c85c61c92aff"
 "checksum wasmi-validation 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ea78c597064ba73596099281e2f4cfc019075122a65cdda3205af94f0b264d93"
 "checksum web-sys 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)" = "aaf97caf6aa8c2b1dac90faf0db529d9d63c93846cca4911856f78a83cebf53b"
-"checksum webpki 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d7e664e770ac0110e2384769bcc59ed19e329d81f555916a6e072714957b81b4"
+"checksum webpki 0.21.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f1f50e1972865d6b1adb54167d1c8ed48606004c2c9d0ea5f1eeb34d95e863ef"
 "checksum webpki-roots 0.17.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a262ae37dd9d60f60dd473d1158f9fbebf110ba7b6a5051c8160460f6043718b"
 "checksum weedle 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3bb43f70885151e629e2a19ce9e50bd730fd436cfd4b666894c9ce4de9141164"
 "checksum which 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5475d47078209a02e60614f7ba5e645ef3ed60f771920ac1906d7c1cc65024c8"
diff --git a/Cargo.toml b/Cargo.toml
index e4b95de80b7a34c78dfe4f342dc6f607b3cc1776..6a73707c4811c22e92a5bd9b29a8ca7966af6c96 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "cargo-contract"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 build = "build.rs"
 edition = "2018"
@@ -27,14 +27,19 @@ cargo_metadata = "0.9.1"
 codec = { package = "parity-scale-codec", version = "1.1" }
 which = "3.1.0"
 colored = "1.9"
+toml = "0.5.4"
+cargo-xbuild = "0.5.26"
+rustc_version = "0.2.3"
+serde_json = "1.0"
+tempfile = "3.1.0"
 
 # dependencies for optional extrinsics feature
 async-std = { version = "1.5.0", optional = true }
 sp-core = { git = "https://github.com/paritytech/substrate/", package = "sp-core", optional = true }
 subxt = { git = "https://github.com/paritytech/substrate-subxt/", rev = "b7565ff435b9499ca1ff4dad519009e94a13111c", package = "substrate-subxt", optional = true }
 futures = { version = "0.3.2", optional = true }
-url = { version = "2.1.1", optional = true }
 hex = { version = "0.4.0", optional = true }
+url = { version = "2.1.1", optional = true }
 
 [build-dependencies]
 anyhow = "1.0.26"
@@ -43,10 +48,9 @@ walkdir = "2.3.1"
 
 [dev-dependencies]
 assert_matches = "1.3.0"
-tempfile = "3.1.0"
 wabt = "0.9.2"
 
 [features]
 default = []
-extrinsics = ["sp-core", "subxt", "async-std", "futures", "url", "hex"]
+extrinsics = ["sp-core", "subxt", "async-std", "futures", "hex", "url"]
 test-ci-only = []
diff --git a/README.md b/README.md
index dda99ea5ca71b4964915f47249dd2d74962dca30..190b9410382d9f9764cb6226dc936597af459471 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,11 @@ A small CLI tool for helping setting up and managing WebAssembly smart contracts
 
 ## Installation
 
+### Prerequisites
+
+- **rust-src**: `rustup component add rust-src`
+- **wasm-opt**: https://github.com/WebAssembly/binaryen#tools
+
 `cargo install --git https://github.com/paritytech/cargo-contract cargo-contract --force`
 
 Use the --force to ensure you are updated to the most recent cargo-contract version.
@@ -35,6 +40,13 @@ SUBCOMMANDS:
     help                 Prints this message or the help of the given subcommand(s)
 ```
 
+## `build` requires the `nightly` toolchain
+
+`cargo contract build` must be run using the `nightly` toolchain. If you have 
+[`rustup`](https://github.com/rust-lang/rustup) installed, the simplest way to do so is `cargo +nightly contract build`.
+To avoid having to add `+nightly` you can also create a `rust-toolchain` file in your local directory containing 
+`nightly`. Read more about how to [specify the rustup toolchain](https://github.com/rust-lang/rustup#override-precedence).
+
 ## Features
 
 The `deploy` and `instantiate` subcommands are **disabled by default**, since they are not fully stable yet and increase the build time.
diff --git a/src/cmd/build.rs b/src/cmd/build.rs
index c054f591ccb9040882a2d3e56aa0c25bc61e404a..20671fff8825702193c616972010c6546397058c 100644
--- a/src/cmd/build.rs
+++ b/src/cmd/build.rs
@@ -17,12 +17,17 @@
 use std::{
     fs::metadata,
     io::{self, Write},
-    path::PathBuf,
+    path::{Path, PathBuf},
     process::Command,
 };
 
+use crate::{
+    util,
+    workspace::{ManifestPath, Workspace},
+    Verbosity,
+};
 use anyhow::{Context, Result};
-use cargo_metadata::MetadataCommand;
+use cargo_metadata::Package;
 use colored::Colorize;
 use parity_wasm::elements::{External, MemoryType, Module, Section};
 
@@ -30,24 +35,25 @@ use parity_wasm::elements::{External, MemoryType, Module, Section};
 const MAX_MEMORY_PAGES: u32 = 16;
 
 /// Relevant metadata obtained from Cargo.toml.
+#[derive(Debug)]
 pub struct CrateMetadata {
+    manifest_path: ManifestPath,
+    cargo_meta: cargo_metadata::Metadata,
     package_name: String,
+    root_package: Package,
     original_wasm: PathBuf,
     pub dest_wasm: PathBuf,
 }
 
-/// Parses the contract manifest and returns relevant metadata.
-pub fn collect_crate_metadata(working_dir: Option<&PathBuf>) -> Result<CrateMetadata> {
-    let mut cmd = MetadataCommand::new();
-    if let Some(dir) = working_dir {
-        cmd.current_dir(dir);
+impl CrateMetadata {
+    pub fn target_dir(&self) -> &Path {
+        self.cargo_meta.target_directory.as_path()
     }
-    let metadata = cmd.exec()?;
+}
 
-    let root_package_id = metadata
-        .resolve
-        .and_then(|resolve| resolve.root)
-        .context("Cannot infer the root project id")?;
+/// Parses the contract manifest and returns relevant metadata.
+pub fn collect_crate_metadata(manifest_path: &ManifestPath) -> Result<CrateMetadata> {
+    let (metadata, root_package_id) = crate::util::get_cargo_metadata(manifest_path)?;
 
     // Find the root package by id in the list of packages. It is logical error if the root
     // package is not found in the list.
@@ -55,7 +61,8 @@ pub fn collect_crate_metadata(working_dir: Option<&PathBuf>) -> Result<CrateMeta
         .packages
         .iter()
         .find(|package| package.id == root_package_id)
-        .expect("The package is not found in the `cargo metadata` output");
+        .expect("The package is not found in the `cargo metadata` output")
+        .clone();
 
     // Normalize the package name.
     let package_name = root_package.name.replace("-", "_");
@@ -72,27 +79,69 @@ pub fn collect_crate_metadata(working_dir: Option<&PathBuf>) -> Result<CrateMeta
     dest_wasm.push(package_name.clone());
     dest_wasm.set_extension("wasm");
 
-    Ok(CrateMetadata {
+    let crate_metadata = CrateMetadata {
+        manifest_path: manifest_path.clone(),
+        cargo_meta: metadata,
+        root_package: root_package.clone(),
         package_name,
         original_wasm,
         dest_wasm,
-    })
+    };
+    Ok(crate_metadata)
 }
 
-/// Invokes `cargo build` in the specified directory, defaults to the current directory.
+/// Builds the project in the specified directory, defaults to the current directory.
 ///
-/// Currently it assumes that user wants to use `+nightly`.
-fn build_cargo_project(working_dir: Option<&PathBuf>) -> Result<()> {
-    super::exec_cargo(
-        "build",
-        &[
+/// Uses [`cargo-xbuild`](https://github.com/rust-osdev/cargo-xbuild) for maximum optimization of
+/// the resulting Wasm binary.
+fn build_cargo_project(crate_metadata: &CrateMetadata, verbosity: Option<Verbosity>) -> Result<()> {
+    util::assert_channel()?;
+
+    // set RUSTFLAGS, read from environment var by cargo-xbuild
+    std::env::set_var(
+        "RUSTFLAGS",
+        "-C link-arg=-z -C link-arg=stack-size=65536 -C link-arg=--import-memory",
+    );
+
+    let verbosity = verbosity.map(|v| match v {
+        Verbosity::Verbose => xargo_lib::Verbosity::Verbose,
+        Verbosity::Quiet => xargo_lib::Verbosity::Quiet,
+    });
+
+    let xbuild = |manifest_path: &ManifestPath| {
+        let manifest_path = Some(manifest_path);
+        let target = Some("wasm32-unknown-unknown");
+        let target_dir = crate_metadata.target_dir();
+        let other_args = [
             "--no-default-features",
             "--release",
-            "--target=wasm32-unknown-unknown",
-            "--verbose",
-        ],
-        working_dir,
-    )
+            &format!("--target-dir={}", target_dir.to_string_lossy()),
+        ];
+        let args = xargo_lib::Args::new(target, manifest_path, verbosity, &other_args)
+            .map_err(|e| anyhow::anyhow!("{}", e))
+            .context("Creating xargo args")?;
+
+        let config = xargo_lib::Config {
+            sysroot_path: target_dir.join("sysroot"),
+            memcpy: false,
+            panic_immediate_abort: true,
+        };
+
+        let exit_status = xargo_lib::build(args, "build", Some(config))
+            .map_err(|e| anyhow::anyhow!("{}", e))
+            .context("Building with xbuild")?;
+        log::debug!("xargo exit status: {:?}", exit_status);
+        Ok(())
+    };
+
+    Workspace::new(&crate_metadata.cargo_meta, &crate_metadata.root_package.id)?
+        .with_root_package_manifest(|manifest| {
+            manifest.with_removed_crate_type("rlib")?;
+            Ok(())
+        })?
+        .using_temp(xbuild)?;
+
+    Ok(())
 }
 
 /// Ensures the wasm memory import of a given module has the maximum number of pages.
@@ -145,7 +194,11 @@ fn strip_custom_sections(module: &mut Module) {
 /// Performs required post-processing steps on the wasm artifact.
 fn post_process_wasm(crate_metadata: &CrateMetadata) -> Result<()> {
     // Deserialize wasm module from a file.
-    let mut module = parity_wasm::deserialize_file(&crate_metadata.original_wasm)?;
+    let mut module =
+        parity_wasm::deserialize_file(&crate_metadata.original_wasm).context(format!(
+            "Loading original wasm file '{}'",
+            crate_metadata.original_wasm.display()
+        ))?;
 
     // Perform optimization.
     //
@@ -198,10 +251,10 @@ fn optimize_wasm(crate_metadata: &CrateMetadata) -> Result<()> {
         anyhow::bail!("wasm-opt optimization failed");
     }
 
-    let original_size = metadata(&crate_metadata.dest_wasm)?.len() / 1000;
-    let optimized_size = metadata(&optimized)?.len() / 1000;
+    let original_size = metadata(&crate_metadata.dest_wasm)?.len() as f64 / 1000.0;
+    let optimized_size = metadata(&optimized)?.len() as f64 / 1000.0;
     println!(
-        " Original wasm size: {}K, Optimized: {}K",
+        " Original wasm size: {:.1}K, Optimized: {:.1}K",
         original_size, optimized_size
     );
 
@@ -213,19 +266,22 @@ fn optimize_wasm(crate_metadata: &CrateMetadata) -> Result<()> {
 /// Executes build of the smart-contract which produces a wasm binary that is ready for deploying.
 ///
 /// It does so by invoking build by cargo and then post processing the final binary.
-pub(crate) fn execute_build(working_dir: Option<&PathBuf>) -> Result<String> {
+pub(crate) fn execute_build(
+    manifest_path: ManifestPath,
+    verbosity: Option<Verbosity>,
+) -> Result<String> {
     println!(
         " {} {}",
         "[1/4]".bold(),
         "Collecting crate metadata".bright_green().bold()
     );
-    let crate_metadata = collect_crate_metadata(working_dir)?;
+    let crate_metadata = collect_crate_metadata(&manifest_path)?;
     println!(
         " {} {}",
         "[2/4]".bold(),
         "Building cargo project".bright_green().bold()
     );
-    build_cargo_project(working_dir)?;
+    build_cargo_project(&crate_metadata, verbosity)?;
     println!(
         " {} {}",
         "[3/4]".bold(),
@@ -248,13 +304,15 @@ pub(crate) fn execute_build(working_dir: Option<&PathBuf>) -> Result<String> {
 #[cfg(feature = "test-ci-only")]
 #[cfg(test)]
 mod tests {
-    use crate::cmd::{execute_new, tests::with_tmp_dir};
+    use crate::{cmd::execute_new, util::tests::with_tmp_dir, workspace::ManifestPath};
 
     #[test]
     fn build_template() {
         with_tmp_dir(|path| {
             execute_new("new_project", Some(path)).expect("new project creation failed");
-            super::execute_build(Some(&path.join("new_project"))).expect("build failed");
+            let manifest_path =
+                ManifestPath::new(&path.join("new_project").join("Cargo.toml")).unwrap();
+            super::execute_build(manifest_path, None).expect("build failed");
         });
     }
 }
diff --git a/src/cmd/deploy.rs b/src/cmd/deploy.rs
index 4b7982333ccaf1d444398d57b4af6344e67d3ab2..733a93ccde09ef9547f11a7d4a2d42ca42a3a507 100644
--- a/src/cmd/deploy.rs
+++ b/src/cmd/deploy.rs
@@ -28,7 +28,7 @@ use crate::{cmd::build, ExtrinsicOpts};
 fn load_contract_code(path: Option<&PathBuf>) -> Result<Vec<u8>> {
     let contract_wasm_path = match path {
         Some(path) => path.clone(),
-        None => build::collect_crate_metadata(path)?.dest_wasm,
+        None => build::collect_crate_metadata(&Default::default())?.dest_wasm,
     };
     log::info!("Contract code path: {}", contract_wasm_path.display());
     let mut data = Vec::new();
@@ -61,10 +61,7 @@ pub(crate) fn execute_deploy(
 mod tests {
     use std::{fs, io::Write};
 
-    use crate::{
-        cmd::{deploy::execute_deploy, tests::with_tmp_dir},
-        ExtrinsicOpts,
-    };
+    use crate::{cmd::deploy::execute_deploy, util::tests::with_tmp_dir, ExtrinsicOpts};
     use assert_matches::assert_matches;
 
     const CONTRACT: &str = r#"
diff --git a/src/cmd/instantiate.rs b/src/cmd/instantiate.rs
index bb473b6c728ddff9ce7695a4637a77fa146e7a4f..29a6d1c4593aa913fd7424edd2f8bb04db5b181b 100644
--- a/src/cmd/instantiate.rs
+++ b/src/cmd/instantiate.rs
@@ -40,10 +40,7 @@ pub(crate) fn execute_instantiate(
 mod tests {
     use std::{fs, io::Write};
 
-    use crate::{
-        cmd::{deploy::execute_deploy, tests::with_tmp_dir},
-        ExtrinsicOpts, HexData,
-    };
+    use crate::{cmd::deploy::execute_deploy, util::tests::with_tmp_dir, ExtrinsicOpts, HexData};
     use assert_matches::assert_matches;
 
     const CONTRACT: &str = r#"
diff --git a/src/cmd/metadata.rs b/src/cmd/metadata.rs
index 733a65c11893702f75a1cb14cf1334755dbc00dc..87d5cb2eb309c9a1bb2d88edb073fe9146d58ee5 100644
--- a/src/cmd/metadata.rs
+++ b/src/cmd/metadata.rs
@@ -14,57 +14,89 @@
 // You should have received a copy of the GNU General Public License
 // along with ink!.  If not, see <http://www.gnu.org/licenses/>.
 
-use std::path::PathBuf;
+use crate::{
+    util,
+    workspace::{ManifestPath, Workspace},
+    Verbosity,
+};
+use anyhow::Result;
 
-use anyhow::{Context, Result};
-use cargo_metadata::MetadataCommand;
+const METADATA_FILE: &str = "metadata.json";
 
 /// Executes build of the smart-contract which produces a wasm binary that is ready for deploying.
 ///
 /// It does so by invoking build by cargo and then post processing the final binary.
-pub(crate) fn execute_generate_metadata(dir: Option<&PathBuf>) -> Result<String> {
+pub(crate) fn execute_generate_metadata(
+    manifest_path: ManifestPath,
+    verbosity: Option<Verbosity>,
+) -> Result<String> {
+    util::assert_channel()?;
     println!("  Generating metadata");
 
-    super::exec_cargo(
-        "run",
-        &[
-            "--package",
-            "abi-gen",
-            "--release",
-            // "--no-default-features", // Breaks builds for MacOS (linker errors), we should investigate this issue asap!
-            "--verbose",
-        ],
-        dir,
-    )?;
+    let (metadata, root_package_id) = crate::util::get_cargo_metadata(&manifest_path)?;
 
-    let cargo_metadata = MetadataCommand::new()
-        .exec()
-        .context("Error invoking `cargo metadata`")?;
-    let mut out_path = cargo_metadata.target_directory;
-    out_path.push("metadata.json");
+    let out_path = metadata.target_directory.join(METADATA_FILE);
+    let out_path_display = format!("{}", out_path.display());
+
+    let target_dir = metadata.target_directory.clone();
+
+    let generate_metadata = move |tmp_manifest_path: &ManifestPath| -> Result<()> {
+        let target_dir_arg = format!("--target-dir={}", target_dir.to_string_lossy());
+        util::invoke_cargo(
+            "run",
+            &[
+                "--package",
+                "abi-gen",
+                &tmp_manifest_path.cargo_arg(),
+                &target_dir_arg,
+                "--release",
+                // "--no-default-features", // Breaks builds for MacOS (linker errors), we should investigate this issue asap!
+            ],
+            manifest_path.directory(),
+            verbosity,
+        )
+    };
+
+    Workspace::new(&metadata, &root_package_id)?
+        .with_root_package_manifest(|manifest| {
+            manifest.with_added_crate_type("rlib")?;
+            Ok(())
+        })?
+        .using_temp(generate_metadata)?;
 
     Ok(format!(
         "Your metadata file is ready.\nYou can find it here:\n{}",
-        out_path.display()
+        out_path_display
     ))
 }
 
 #[cfg(feature = "test-ci-only")]
 #[cfg(test)]
 mod tests {
-    use crate::cmd::{execute_generate_metadata, execute_new, tests::with_tmp_dir};
+    use crate::{
+        cmd::{execute_generate_metadata, execute_new},
+        util::tests::with_tmp_dir,
+        workspace::ManifestPath,
+    };
 
     #[test]
     fn generate_metadata() {
+        env_logger::try_init().ok();
         with_tmp_dir(|path| {
             execute_new("new_project", Some(path)).expect("new project creation failed");
             let working_dir = path.join("new_project");
-            execute_generate_metadata(Some(&working_dir)).expect("generate metadata failed");
+            let manifest_path = ManifestPath::new(working_dir.join("Cargo.toml")).unwrap();
+            let message =
+                execute_generate_metadata(manifest_path, None).expect("generate metadata failed");
+            println!("{}", message);
 
             let mut abi_file = working_dir;
             abi_file.push("target");
             abi_file.push("metadata.json");
-            assert!(abi_file.exists())
+            assert!(
+                abi_file.exists(),
+                format!("Missing metadata file '{}'", abi_file.display())
+            )
         });
     }
 }
diff --git a/src/cmd/mod.rs b/src/cmd/mod.rs
index a7f9988296f82077fe3c99d5229166f2f85c5cc9..5b8c1b1e9cda7a4f5f1c1cd8c17c1ccc87c439e8 100644
--- a/src/cmd/mod.rs
+++ b/src/cmd/mod.rs
@@ -14,13 +14,6 @@
 // You should have received a copy of the GNU General Public License
 // along with ink!.  If not, see <http://www.gnu.org/licenses/>.
 
-use anyhow::Result;
-use std::{
-    io::{self, Write},
-    path::PathBuf,
-    process::Command,
-};
-
 mod build;
 #[cfg(feature = "extrinsics")]
 mod deploy;
@@ -38,47 +31,3 @@ pub(crate) use self::{
 pub(crate) use self::{
     deploy::execute_deploy, extrinsics::submit_extrinsic, instantiate::execute_instantiate,
 };
-
-fn exec_cargo(command: &str, args: &[&'static str], working_dir: Option<&PathBuf>) -> Result<()> {
-    let mut cmd = Command::new("cargo");
-    let mut is_nightly_cmd = Command::new("cargo");
-    if let Some(dir) = working_dir {
-        cmd.current_dir(dir);
-        is_nightly_cmd.current_dir(dir);
-    }
-
-    let is_nightly_default = is_nightly_cmd
-        .arg("--version")
-        .output()
-        .map_err(|_| ())
-        .and_then(|o| String::from_utf8(o.stdout).map_err(|_| ()))
-        .unwrap_or_default()
-        .contains("-nightly");
-
-    if !is_nightly_default {
-        cmd.arg("+nightly");
-    }
-
-    let output = cmd.arg(command).args(args).output()?;
-
-    if !output.status.success() {
-        // Dump the output streams produced by cargo into the stdout/stderr.
-        io::stdout().write_all(&output.stdout)?;
-        io::stderr().write_all(&output.stderr)?;
-        anyhow::bail!("Build failed");
-    }
-
-    Ok(())
-}
-
-#[cfg(test)]
-mod tests {
-    use std::path::PathBuf;
-    use tempfile::TempDir;
-
-    pub fn with_tmp_dir<F: FnOnce(&PathBuf)>(f: F) {
-        let tmp_dir = TempDir::new().expect("temporary directory creation failed");
-
-        f(&tmp_dir.into_path());
-    }
-}
diff --git a/src/cmd/new.rs b/src/cmd/new.rs
index eee64c46136766ca4aee790de98816f0217e6dfb..4291ed50e261244199750aed1d2e9cdb56388f40 100644
--- a/src/cmd/new.rs
+++ b/src/cmd/new.rs
@@ -97,7 +97,7 @@ pub(crate) fn execute_new(name: &str, dir: Option<&PathBuf>) -> Result<String> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::cmd::{execute_new, tests::with_tmp_dir};
+    use crate::{cmd::execute_new, util::tests::with_tmp_dir};
 
     #[test]
     fn rejects_hyphenated_name() {
@@ -116,10 +116,12 @@ mod tests {
             let name = "test_contract_cargo_project_already_exists";
             let _ = execute_new(name, Some(path));
             let result = execute_new(name, Some(path));
+
+            assert!(result.is_err(), "Should fail");
             assert_eq!(
-                format!("{:?}", result),
-                r#"Err(A Cargo package already exists in test_contract_cargo_project_already_exists)"#
-            )
+                result.err().unwrap().to_string(),
+                "A Cargo package already exists in test_contract_cargo_project_already_exists"
+            );
         });
     }
 
@@ -131,10 +133,12 @@ mod tests {
             fs::create_dir_all(&dir).unwrap();
             fs::File::create(dir.join(".gitignore")).unwrap();
             let result = execute_new(name, Some(path));
+
+            assert!(result.is_err(), "Should fail");
             assert_eq!(
-                format!("{:?}", result),
-                r#"Err(New contract file .gitignore already exists)"#
-            )
+                result.err().unwrap().to_string(),
+                "New contract file .gitignore already exists"
+            );
         });
     }
 }
diff --git a/src/main.rs b/src/main.rs
index 361847de1bdb92c998516304b28dfc189178664d..7bd4cf9291ecc8927cbb1b7c88d6a0461a62be3d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -15,12 +15,18 @@
 // along with ink!.  If not, see <http://www.gnu.org/licenses/>.
 
 mod cmd;
+mod util;
+mod workspace;
 
 #[cfg(feature = "extrinsics")]
 use sp_core::{crypto::Pair, sr25519, H256};
-use std::path::PathBuf;
+use std::{
+    convert::{TryFrom, TryInto},
+    path::PathBuf,
+};
 
-use anyhow::Result;
+use anyhow::{Error, Result};
+use colored::Colorize;
 use structopt::{clap, StructOpt};
 
 #[derive(Debug, StructOpt)]
@@ -83,6 +89,32 @@ impl ExtrinsicOpts {
     }
 }
 
+#[derive(Debug, StructOpt)]
+struct VerbosityFlags {
+    #[structopt(long)]
+    quiet: bool,
+    #[structopt(long)]
+    verbose: bool,
+}
+
+enum Verbosity {
+    Quiet,
+    Verbose,
+}
+
+impl TryFrom<&VerbosityFlags> for Option<Verbosity> {
+    type Error = Error;
+
+    fn try_from(value: &VerbosityFlags) -> Result<Self, Self::Error> {
+        match (value.quiet, value.verbose) {
+            (false, false) => Ok(None),
+            (true, false) => Ok(Some(Verbosity::Quiet)),
+            (false, true) => Ok(Some(Verbosity::Verbose)),
+            (true, true) => anyhow::bail!("Cannot pass both --quiet and --verbose flags"),
+        }
+    }
+}
+
 #[derive(Debug, StructOpt)]
 enum Command {
     /// Setup and create a new smart contract project
@@ -96,10 +128,16 @@ enum Command {
     },
     /// Compiles the smart contract
     #[structopt(name = "build")]
-    Build {},
+    Build {
+        #[structopt(flatten)]
+        verbosity: VerbosityFlags,
+    },
     /// Generate contract metadata artifacts
     #[structopt(name = "generate-metadata")]
-    GenerateMetadata {},
+    GenerateMetadata {
+        #[structopt(flatten)]
+        verbosity: VerbosityFlags,
+    },
     /// Test the smart contract off-chain
     #[structopt(name = "test")]
     Test {},
@@ -148,15 +186,23 @@ fn main() {
     let Opts::Contract(args) = Opts::from_args();
     match exec(args.cmd) {
         Ok(msg) => println!("\t{}", msg),
-        Err(err) => eprintln!("error: {}", err),
+        Err(err) => eprintln!(
+            "{} {}",
+            "ERROR:".bright_red().bold(),
+            format!("{:?}", err).bright_red()
+        ),
     }
 }
 
 fn exec(cmd: Command) -> Result<String> {
     match &cmd {
         Command::New { name, target_dir } => cmd::execute_new(name, target_dir.as_ref()),
-        Command::Build {} => cmd::execute_build(None),
-        Command::GenerateMetadata {} => cmd::execute_generate_metadata(None),
+        Command::Build { verbosity } => {
+            cmd::execute_build(Default::default(), verbosity.try_into()?)
+        }
+        Command::GenerateMetadata { verbosity } => {
+            cmd::execute_generate_metadata(Default::default(), verbosity.try_into()?)
+        }
         Command::Test {} => Err(anyhow::anyhow!("Command unimplemented")),
         #[cfg(feature = "extrinsics")]
         Command::Deploy {
diff --git a/src/util.rs b/src/util.rs
new file mode 100644
index 0000000000000000000000000000000000000000..4dd2560277851c74aab1db30d51a624c80bfc955
--- /dev/null
+++ b/src/util.rs
@@ -0,0 +1,103 @@
+// Copyright 2018-2019 Parity Technologies (UK) Ltd.
+// This file is part of ink!.
+//
+// ink! is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ink! is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ink!.  If not, see <http://www.gnu.org/licenses/>.
+
+use crate::{workspace::ManifestPath, Verbosity};
+use anyhow::{Context, Result};
+use cargo_metadata::{Metadata as CargoMetadata, MetadataCommand, PackageId};
+use rustc_version::Channel;
+use std::{ffi::OsStr, path::Path, process::Command};
+
+/// Get the result of `cargo metadata`, together with the root package id.
+pub fn get_cargo_metadata(manifest_path: &ManifestPath) -> Result<(CargoMetadata, PackageId)> {
+    let mut cmd = MetadataCommand::new();
+    let metadata = cmd
+        .manifest_path(manifest_path)
+        .exec()
+        .context("Error invoking `cargo metadata`")?;
+    let root_package_id = metadata
+        .resolve
+        .as_ref()
+        .and_then(|resolve| resolve.root.as_ref())
+        .context("Cannot infer the root project id")?
+        .clone();
+    Ok((metadata, root_package_id))
+}
+
+/// Check whether the current rust channel is valid: `nightly` is recommended.
+pub fn assert_channel() -> Result<()> {
+    let meta = rustc_version::version_meta()?;
+    match meta.channel {
+        Channel::Dev | Channel::Nightly => Ok(()),
+        Channel::Stable | Channel::Beta => {
+            anyhow::bail!(
+                "cargo-contract cannot build using the {:?} channel. \
+                Switch to nightly. \
+                See https://github.com/paritytech/cargo-contract#build-requires-the-nightly-toolchain",
+                format!("{:?}", meta.channel).to_lowercase(),
+            );
+        }
+    }
+}
+
+/// Run cargo with the supplied args
+pub(crate) fn invoke_cargo<I, S, P>(
+    command: &str,
+    args: I,
+    working_dir: Option<P>,
+    verbosity: Option<Verbosity>,
+) -> Result<()>
+where
+    I: IntoIterator<Item = S> + std::fmt::Debug,
+    S: AsRef<OsStr>,
+    P: AsRef<Path>,
+{
+    let cargo = std::env::var("CARGO").unwrap_or("cargo".to_string());
+    let mut cmd = Command::new(cargo);
+    if let Some(path) = working_dir {
+        log::debug!("Setting cargo working dir to '{}'", path.as_ref().display());
+        cmd.current_dir(path);
+    }
+
+    cmd.arg(command);
+    cmd.args(args);
+    match verbosity {
+        Some(Verbosity::Quiet) => cmd.arg("--quiet"),
+        Some(Verbosity::Verbose) => cmd.arg("--verbose"),
+        None => &mut cmd,
+    };
+
+    let status = cmd
+        .status()
+        .context(format!("Error executing `{:?}`", cmd))?;
+
+    if status.success() {
+        Ok(())
+    } else {
+        anyhow::bail!("`{:?}` failed with exit code: {:?}", cmd, status.code());
+    }
+}
+
+#[cfg(test)]
+pub mod tests {
+    use std::path::PathBuf;
+    use tempfile::TempDir;
+
+    pub fn with_tmp_dir<F: FnOnce(&PathBuf)>(f: F) {
+        let tmp_dir = TempDir::new().expect("temporary directory creation failed");
+
+        f(&tmp_dir.into_path());
+    }
+}
diff --git a/src/workspace.rs b/src/workspace.rs
new file mode 100644
index 0000000000000000000000000000000000000000..37f74d8ff360768e497501af1571509d9b6381a2
--- /dev/null
+++ b/src/workspace.rs
@@ -0,0 +1,393 @@
+// Copyright 2018-2019 Parity Technologies (UK) Ltd.
+// This file is part of ink!.
+//
+// ink! is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ink! is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ink!.  If not, see <http://www.gnu.org/licenses/>.
+
+use anyhow::{Context, Result};
+use cargo_metadata::{Metadata as CargoMetadata, Package, PackageId};
+use std::convert::{TryFrom, TryInto};
+use std::{
+    collections::{HashMap, HashSet},
+    fs,
+    path::{Path, PathBuf},
+};
+use toml::value;
+
+const MANIFEST_FILE: &str = "Cargo.toml";
+
+/// Path to a Cargo.toml file
+#[derive(Clone, Debug)]
+pub struct ManifestPath {
+    path: PathBuf,
+}
+
+impl ManifestPath {
+    /// Create a new ManifestPath, errors if not path to `Cargo.toml`
+    pub fn new<P: AsRef<Path>>(path: P) -> Result<Self> {
+        let manifest = path.as_ref();
+        if let Some(file_name) = manifest.file_name() {
+            if file_name != MANIFEST_FILE {
+                anyhow::bail!("Manifest file must be a Cargo.toml")
+            }
+        }
+        Ok(ManifestPath {
+            path: manifest.into(),
+        })
+    }
+
+    /// Create an arg `--manifest-path=` for `cargo` command
+    pub fn cargo_arg(&self) -> String {
+        format!("--manifest-path={}", self.path.to_string_lossy())
+    }
+
+    /// The directory path of the manifest path.
+    ///
+    /// Returns `None` if the path is just the plain file name `Cargo.toml`
+    pub fn directory(&self) -> Option<&Path> {
+        let just_a_file_name =
+            self.path.iter().collect::<Vec<_>>() == vec![Path::new(MANIFEST_FILE)];
+        if !just_a_file_name {
+            self.path.parent()
+        } else {
+            None
+        }
+    }
+}
+
+impl TryFrom<&PathBuf> for ManifestPath {
+    type Error = anyhow::Error;
+
+    fn try_from(value: &PathBuf) -> Result<Self, Self::Error> {
+        ManifestPath::new(value)
+    }
+}
+
+impl Default for ManifestPath {
+    fn default() -> ManifestPath {
+        ManifestPath::new(MANIFEST_FILE).expect("it's a valid manifest file")
+    }
+}
+
+impl AsRef<Path> for ManifestPath {
+    fn as_ref(&self) -> &Path {
+        self.path.as_ref()
+    }
+}
+
+/// Create, amend and save a copy of the specified `Cargo.toml`.
+pub struct Manifest {
+    path: ManifestPath,
+    toml: value::Table,
+}
+
+impl Manifest {
+    /// Create new CargoToml for the given manifest path.
+    ///
+    /// The path *must* be to a `Cargo.toml`.
+    pub fn new<P>(path: P) -> Result<Manifest>
+    where
+        P: TryInto<ManifestPath, Error = anyhow::Error>,
+    {
+        let manifest_path = path.try_into()?;
+        let toml = fs::read_to_string(&manifest_path).context("Loading Cargo.toml")?;
+        let toml: value::Table = toml::from_str(&toml)?;
+
+        Ok(Manifest {
+            path: manifest_path,
+            toml,
+        })
+    }
+
+    /// Get mutable reference to `[lib] crate-types = []` section
+    fn get_crate_types_mut(&mut self) -> Result<&mut value::Array> {
+        let lib = self
+            .toml
+            .get_mut("lib")
+            .ok_or(anyhow::anyhow!("lib section not found"))?;
+        let crate_types = lib
+            .get_mut("crate-type")
+            .ok_or(anyhow::anyhow!("crate-type section not found"))?;
+
+        crate_types
+            .as_array_mut()
+            .ok_or(anyhow::anyhow!("crate-types should be an Array"))
+    }
+
+    /// Add a value to the `[lib] crate-types = []` section.
+    ///
+    /// If the value already exists, does nothing.
+    pub fn with_added_crate_type(&mut self, crate_type: &str) -> Result<&mut Self> {
+        let crate_types = self.get_crate_types_mut()?;
+        if !crate_type_exists(crate_type, crate_types) {
+            crate_types.push(crate_type.into());
+        }
+        Ok(self)
+    }
+
+    /// Remove a value from the `[lib] crate-types = []` section
+    ///
+    /// If the value does not exist, does nothing.
+    pub fn with_removed_crate_type(&mut self, crate_type: &str) -> Result<&mut Self> {
+        let crate_types = self.get_crate_types_mut()?;
+        if crate_type_exists(crate_type, crate_types) {
+            crate_types.retain(|v| v.as_str().map_or(true, |s| s != crate_type));
+        }
+        Ok(self)
+    }
+
+    /// Replace relative paths with absolute paths with the working directory.
+    ///
+    /// Enables the use of a temporary amended copy of the manifest.
+    ///
+    /// # Rewrites
+    ///
+    /// - `[lib]/path`
+    /// - `[dependencies]`
+    ///
+    /// Dependencies with package names specified in `exclude_deps` will not be rewritten.
+    fn rewrite_relative_paths<I, S>(&mut self, exclude_deps: I) -> Result<&mut Self>
+    where
+        I: IntoIterator<Item = S>,
+        S: AsRef<str>,
+    {
+        let abs_path = self.path.as_ref().canonicalize()?;
+        let abs_dir = abs_path
+            .parent()
+            .expect("The manifest path is a file path so has a parent; qed");
+
+        let to_absolute = |value_id: String, existing_path: &mut value::Value| -> Result<()> {
+            let path_str = existing_path
+                .as_str()
+                .ok_or(anyhow::anyhow!("{} should be a string", value_id))?;
+            let path = PathBuf::from(path_str);
+            if path.is_relative() {
+                let lib_abs = abs_dir.join(path);
+                log::debug!("Rewriting {} to '{}'", value_id, lib_abs.display());
+                *existing_path = value::Value::String(lib_abs.to_string_lossy().into())
+            }
+            Ok(())
+        };
+
+        let rewrite_path = |table_value: &mut value::Value, table_section: &str, default: &str| {
+            let table = table_value.as_table_mut().ok_or(anyhow::anyhow!(
+                "'[{}]' section should be a table",
+                table_section
+            ))?;
+
+            match table.get_mut("path") {
+                Some(existing_path) => {
+                    to_absolute(format!("[{}]/path", table_section), existing_path)
+                }
+                None => {
+                    let default_path = PathBuf::from(default);
+                    if !default_path.exists() {
+                        anyhow::bail!(
+                            "No path specified, and the default `{}` was not found",
+                            default
+                        )
+                    }
+                    let path = abs_dir.join(default_path);
+                    log::debug!("Adding default path '{}'", path.display());
+                    table.insert(
+                        "path".into(),
+                        value::Value::String(path.to_string_lossy().into()),
+                    );
+                    Ok(())
+                }
+            }
+        };
+
+        // Rewrite `[lib] path = /path/to/lib.rs`
+        if let Some(lib) = self.toml.get_mut("lib") {
+            rewrite_path(lib, "lib", "src/lib.rs")?;
+        }
+
+        // Rewrite `[[bin]] path = /path/to/main.rs`
+        if let Some(bin) = self.toml.get_mut("bin") {
+            let bins = bin
+                .as_array_mut()
+                .ok_or(anyhow::anyhow!("'[[bin]]' section should be a table array"))?;
+
+            // Rewrite `[[bin]] path =` value to an absolute path.
+            for bin in bins {
+                rewrite_path(bin, "[bin]", "src/main.rs")?;
+            }
+        }
+
+        // Rewrite any dependency relative paths
+        if let Some(dependencies) = self.toml.get_mut("dependencies") {
+            let exclude = exclude_deps
+                .into_iter()
+                .map(|s| s.as_ref().to_string())
+                .collect::<HashSet<_>>();
+            let table = dependencies
+                .as_table_mut()
+                .ok_or(anyhow::anyhow!("dependencies should be a table"))?;
+            for (name, value) in table {
+                let package_name = {
+                    let package = value.get("package");
+                    let package_name = package.and_then(|p| p.as_str()).unwrap_or(name);
+                    package_name.to_string()
+                };
+
+                if !exclude.contains(&package_name) {
+                    if let Some(dependency) = value.as_table_mut() {
+                        if let Some(dep_path) = dependency.get_mut("path") {
+                            to_absolute(format!("dependency {}", package_name), dep_path)?;
+                        }
+                    }
+                }
+            }
+        }
+
+        Ok(self)
+    }
+
+    /// Writes the amended manifest to the given path.
+    pub fn write(&self, path: &ManifestPath) -> Result<()> {
+        let manifest_path = path.as_ref();
+
+        if let Some(dir) = manifest_path.parent() {
+            fs::create_dir_all(&dir).context(format!("Creating directory '{}'", dir.display()))?;
+        }
+
+        let updated_toml = toml::to_string(&self.toml)?;
+        log::debug!("Writing updated manifest to '{}'", manifest_path.display());
+        fs::write(&manifest_path, updated_toml)?;
+        Ok(())
+    }
+}
+
+fn crate_type_exists(crate_type: &str, crate_types: &value::Array) -> bool {
+    crate_types
+        .iter()
+        .any(|v| v.as_str().map_or(false, |s| s == crate_type))
+}
+
+/// Make a copy of a cargo workspace, maintaining only the directory structure and manifest
+/// files. Relative paths to source files and non-workspace dependencies are rewritten to absolute
+/// paths to the original locations.
+///
+/// This allows custom amendments to be made to the manifest files without editing the originals
+/// directly.
+pub struct Workspace {
+    workspace_root: PathBuf,
+    root_package: PackageId,
+    members: HashMap<PackageId, (Package, Manifest)>,
+}
+
+impl Workspace {
+    /// Create a new Workspace from the supplied cargo metadata.
+    pub fn new(metadata: &CargoMetadata, root_package: &PackageId) -> Result<Self> {
+        let member_manifest = |package_id: &PackageId| -> Result<(PackageId, (Package, Manifest))> {
+            let package = metadata
+                .packages
+                .iter()
+                .find(|p| p.id == *package_id)
+                .expect(&format!(
+                    "Package '{}' is a member and should be in the packages list",
+                    package_id
+                ));
+            let manifest = Manifest::new(&package.manifest_path)?;
+            Ok((package_id.clone(), (package.clone(), manifest)))
+        };
+
+        let members = metadata
+            .workspace_members
+            .iter()
+            .map(member_manifest)
+            .collect::<Result<HashMap<_, _>>>()?;
+
+        if !members.contains_key(root_package) {
+            anyhow::bail!("The root package should be a workspace member")
+        }
+
+        Ok(Workspace {
+            workspace_root: metadata.workspace_root.clone(),
+            root_package: root_package.clone(),
+            members,
+        })
+    }
+
+    /// Amend the root package manifest using the supplied function.
+    ///
+    /// # Note
+    ///
+    /// The root package is the current workspace package being built, not to be confused with
+    /// the workspace root (where the top level workspace Cargo.toml is defined).
+    pub fn with_root_package_manifest<F>(&mut self, f: F) -> Result<&mut Self>
+    where
+        F: FnOnce(&mut Manifest) -> Result<()>,
+    {
+        let root_package_manifest = self
+            .members
+            .get_mut(&self.root_package)
+            .map(|(_, m)| m)
+            .expect("The root package should be a workspace member");
+        f(root_package_manifest)?;
+        Ok(self)
+    }
+
+    /// Writes the amended manifests to the `target` directory, retaining the workspace directory
+    /// structure, but only with the `Cargo.toml` files.
+    ///
+    /// Relative paths will be rewritten to absolute paths from the original workspace root, except
+    /// intra-workspace relative dependency paths which will be preserved.
+    ///
+    /// Returns the paths of the new manifests.
+    pub fn write<P: AsRef<Path>>(&mut self, target: P) -> Result<Vec<(PackageId, ManifestPath)>> {
+        let exclude_member_package_names = self
+            .members
+            .iter()
+            .map(|(_, (p, _))| p.name.clone())
+            .collect::<Vec<_>>();
+        let mut new_manifest_paths = Vec::new();
+        for (package_id, (package, manifest)) in self.members.iter_mut() {
+            // replace the original workspace root with the temporary directory
+            let mut new_path: PathBuf = target.as_ref().into();
+            new_path.push(package.manifest_path.strip_prefix(&self.workspace_root)?);
+            let new_manifest = ManifestPath::new(new_path)?;
+
+            manifest.rewrite_relative_paths(&exclude_member_package_names)?;
+            manifest.write(&new_manifest)?;
+
+            new_manifest_paths.push((package_id.clone(), new_manifest));
+        }
+        Ok(new_manifest_paths)
+    }
+
+    /// Copy the workspace with amended manifest files to a temporary directory, executing the
+    /// supplied function with the root manifest path before the directory is cleaned up.
+    pub fn using_temp<F>(&mut self, f: F) -> Result<()>
+    where
+        F: FnOnce(&ManifestPath) -> Result<()>,
+    {
+        let tmp_dir = tempfile::Builder::new()
+            .prefix(".cargo-contract_")
+            .tempdir()?;
+        log::debug!("Using temp workspace at '{}'", tmp_dir.path().display());
+        let new_paths = self.write(&tmp_dir)?;
+        let root_manifest_path = new_paths
+            .iter()
+            .find_map(|(pid, path)| {
+                if *pid == self.root_package {
+                    Some(path)
+                } else {
+                    None
+                }
+            })
+            .expect("root package should be a member of the temp workspace");
+        f(root_manifest_path)
+    }
+}
diff --git a/template/.cargo/config b/template/.cargo/config
deleted file mode 100644
index 9ed784e6e2d7880195e9c99e32a1a21cf2379e9b..0000000000000000000000000000000000000000
--- a/template/.cargo/config
+++ /dev/null
@@ -1,4 +0,0 @@
-[target.wasm32-unknown-unknown]
-rustflags = [
-	"-C", "link-args=-z stack-size=65536 --import-memory"
-]
\ No newline at end of file
diff --git a/template/.gitignore b/template/.gitignore
index bf910de10afda831bba64b433f6cc5ea2ef0a4c9..8de8f877e477591f0fdf704abb5fca341fb2688a 100644
--- a/template/.gitignore
+++ b/template/.gitignore
@@ -6,4 +6,4 @@
 
 # Remove Cargo.lock when creating an executable, leave it for libraries
 # More information here http://doc.crates.io/guide.html#cargotoml-vs-cargolock
-Cargo.lock
\ No newline at end of file
+Cargo.lock
diff --git a/template/Cargo.toml b/template/Cargo.toml
index 8bb06c94dd0c86eac48556d950a3b87b8850d0d0..8fe3cd7ac4a54d43ada06a3c562e8ab9c90cbf13 100644
--- a/template/Cargo.toml
+++ b/template/Cargo.toml
@@ -19,7 +19,8 @@ path = "lib.rs"
 crate-type = [
 	# Used for normal contract Wasm blobs.
 	"cdylib",
-	# Used for ABI generation.
+	# Required for ABI generation, and using this contract as a dependency.
+	# If using `cargo contract build`, it will be automatically disabled to produce a smaller Wasm binary
 	"rlib",
 ]