sign method
Implementation
Future<void> sign(Transaction tx, PrivateKey prikey,
{SignatureSchema schema}) async {
var sig = await TxSignature.create(tx, prikey, schema: schema);
tx.sigs = [sig];
}
Future<void> sign(Transaction tx, PrivateKey prikey,
{SignatureSchema schema}) async {
var sig = await TxSignature.create(tx, prikey, schema: schema);
tx.sigs = [sig];
}