bytesToPost includes the raw transaction appended with the various signatures
they often include nonce and chainID, but not other signatures
identifier is usually some sort of hash of bytesToPost, chain-dependent
chain-dependent way to calculate address from a public key
chain-dependent validation of address
parseBytes will recover bytes from the blockchain into a format we can use
Generated using TypeDoc
TxCodec knows how to convert Transactions to bytes for a given blockchain