Port over spec header

runtime/src/lib.rs

@@ -45,6 +45,7 @@ mod genesis;
 mod storage;
 mod consts;
 mod attestation;
+mod spec;
 
 use rstd::prelude::*;
 use primitives::{H256, ValidatorId, OpaqueMetadata};

runtime/src/spec.rs

+use primitives::H256;
+use rstd::prelude::Vec;
+use attestation::AttestationRecord;
+
+#[derive(Clone, PartialEq, Eq, Default, SszEncode, SszDecode, SszHash)]
+#[cfg_attr(feature = "std", derive(Debug))]
+#[ssz_codec(sorted)]
+pub struct SpecHeader {
+	pub parent_hash: H256,
+	pub slot_number: u64,
+	pub randao_reveal: H256,
+	pub attestations: Vec<AttestationRecord>,
+	pub pow_chain_ref: H256,
+	pub active_state_root: H256,
+	pub crystallized_state_root: H256,
+}