Block Format

Blocks are composed of the header, the extrinsics and the justification.

The header contains data that is necessary for synchronization, plus commitments to accumulators (i.e. for the extrinsics and the state).
The justification contains the information necessary to make the block valid according to the consensus rules.
The extrinsics are all the data that is to be input into the state transition function.

Macro blocks

Version [16-bit unsigned integer]: The current version of the block format,
Block number [32-bit unsigned integer]: The number of the current block,
View number [32-bit unsigned integer]: The view number of the current block,
Parent hash [256-bit Blake2b hash]: The hash of the previous block header,
Parent macro hash [256-bit Blake2b hash]: The hash of the previous macro block header,
Timestamp [64-bit unsigned integer]: An Unix timestamp,
Random Seed [BLS signature]: The random seed for the current block,
State root [256-bit Blake2b hash]: The root of a Merkle tree over the current state,
Extrinsics root [256-bit Blake2b hash]: The root of a Merkle tree over the extrinsics included in this block,
Transactions root [256-bit Blake2b hash]: The root of a Merkle tree over all transactions from the previous epoch,
Validators [Validator slots]: The list of the validator slots information for the new epoch.

1st round validator subset [BitSet]: The list of validators that participated in the 1st round of signatures,
1st round aggregated signature [BLS signature]: The aggregated signature of the validators that participated in the 1st round,
2nd round validator subset [BitSet]: The list of validators that participated in the 2nd round of signatures,
2nd round aggregated signature [BLS signature]: The aggregated signature of the validators that participated in the 2nd round.

Stakers [StakeSlots]: The slots with the staker information (i.e. staker address and reward address),
Slashed set [BitSet]: The final list of slashed validators from the previous epoch,
Fork proofs [Vec]: Proofs attesting to the creation of a fork by a validator.

Version [16-bit unsigned integer]: The current version of the block format,
Block number [32-bit unsigned integer]: The number of the current block,
View number [32-bit unsigned integer]: The view number of the current block,
Parent hash [256-bit Blake2b hash]: The hash of the previous block header,
Timestamp [64-bit unsigned integer]: An Unix timestamp,
Random Seed [BLS signature]: The random seed for the current block,
State root [256-bit Blake2b hash]: The root of a Merkle tree over the current state,
Extrinsics root [256-bit Blake2b hash]: The root of a Merkle tree over the extrinsics included in this block.

View change proof [BitSet + BLS signature]: A proof attesting to the validity of a view change,
Signature [BLS signature]: The signature of the validators that produced the current block.