sha256 serialized transaction data. Use this for raw secp256k1 or ed25519 signing.
Use case: raw signer uses native secp256k1 to sign the message. i.e FireblocksSigner
data
β’ Optionaldata: any
Custom data of the transaction for a signer to process and sign specific to the blockchain.
Use case: integration with web wallets (i.e Keplr Wallet) that don't expose raw signing, but instead require blockchain specific objects, such as SignDoc for Cosmos networks