EIP-6493: SSZ 交易签名方案

class ExecutionSigningData(Container):
    object_root: Root
    domain_type: DomainType

def compute_ssz_sig_hash(payload: TransactionPayload) -> Hash32:
    return Hash32(ExecutionSigningData(
        object_root=payload.hash_tree_root(),
        domain=DOMAIN_TX_SSZ,
    ).hash_tree_root())

def compute_ssz_tx_hash(tx: Transaction) -> Hash32:
    assert tx.payload.type_ is None
    return Hash32(tx.hash_tree_root())

class BasicTransactionPayload(Profile[TransactionPayload]):
    chain_id: ChainId
    nonce: uint64
    max_fees_per_gas: BasicFeesPerGas
    gas: GasAmount
    to: Optional[ExecutionAddress]
    value: uint256
    input_: ByteList[MAX_CALLDATA_SIZE]
    access_list: List[AccessTuple, MAX_ACCESS_LIST_SIZE]
    max_priority_fees_per_gas: BasicFeesPerGas

class BasicTransaction(Container):
    payload: BasicTransactionPayload
    signature: Secp256k1ExecutionSignature

class BlobTransactionPayload(Profile[TransactionPayload]):
    chain_id: ChainId
    nonce: uint64
    max_fees_per_gas: BlobFeesPerGas
    gas: GasAmount
    to: ExecutionAddress
    value: uint256
    input_: ByteList[MAX_CALLDATA_SIZE]
    access_list: List[AccessTuple, MAX_ACCESS_LIST_SIZE]
    max_priority_fees_per_gas: BlobFeesPerGas
    blob_versioned_hashes: List[VersionedHash, MAX_BLOB_COMMITMENTS_PER_BLOCK]

class BlobTransaction(Container):
    payload: BlobTransactionPayload
    signature: Secp256k1ExecutionSignature

def identify_transaction_profile(tx: Transaction) -> Type[Profile]:
    if tx.payload.type_ is None:
        if tx.payload.blob_versioned_hashes is not None:
            return BlobTransaction

        return BasicTransaction

    else:
        if tx.payload.type_ == BLOB_TX_TYPE:
            return RlpBlobTransaction

        if tx.payload.type_ == FEE_MARKET_TX_TYPE:
            return RlpFeeMarketTransaction

        if tx.payload.type_ == ACCESS_LIST_TX_TYPE:
            return RlpAccessListTransaction

        if tx.payload.type_ == LEGACY_TX_TYPE:
            return RlpLegacyTransaction

        raise Exception(f'Unsupported transaction: {tx}')