appendSignMultisigTransactionWithSigner takes a multisig transaction blob, and appends the given
signer's signature to it. While we could derive public key preimagery from the partially-signed
multisig transaction, we ask the caller to pass it back in, to ensure they know what they are
signing.
As with signMultisigTransactionWithSigner, the signer's key is taken from the sgnr
field of the transaction it returns, falling back to the transaction sender when sgnr is
absent.
Parameters
multisigTxnBlob: Uint8Array
an encoded multisig txn. Supports non-payment txn types.
appendSignMultisigTransactionWithSigner takes a multisig transaction blob, and appends the given signer's signature to it. While we could derive public key preimagery from the partially-signed multisig transaction, we ask the caller to pass it back in, to ensure they know what they are signing.
As with signMultisigTransactionWithSigner, the signer's key is taken from the
sgnrfield of the transaction it returns, falling back to the transaction sender whensgnris absent.