Fix extrinsic params for contract chains (#523)

* Fix extrinsic params for contract chains

* Update CHANGELOG.md

CHANGELOG.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+-  Fix extrinsic params for contract chains - [#523](https://github.com/paritytech/cargo-contract/pull/523)
+
 ## [1.2.0] - 2022-04-13
 
 ### Added

src/cmd/extrinsics/mod.rs

@@ -66,7 +66,7 @@ type Balance = u128;
 type CodeHash = <DefaultConfig as Config>::Hash;
 type ContractAccount = <DefaultConfig as Config>::AccountId;
 type PairSigner = subxt::PairSigner<DefaultConfig, sp_core::sr25519::Pair>;
-type SignedExtra = subxt::SubstrateExtrinsicParams<DefaultConfig>;
+type SignedExtra = subxt::PolkadotExtrinsicParams<DefaultConfig>;
 type RuntimeApi = runtime_api::api::RuntimeApi<DefaultConfig, SignedExtra>;
 
 /// Arguments required for creating and sending an extrinsic to a substrate node.