rawToSigned method
Implementation
SignedTransaction rawToSigned(RawTransaction rawTxn) {
final signingMessage = TransactionBuilder.getSigningMessage(rawTxn);
final signature = signingFunction(signingMessage);
final authenticator = TransactionAuthenticatorEd25519(
Ed25519PublicKey(publicKey),
signature as Ed25519Signature,
);
return SignedTransaction(rawTxn, authenticator);
}