public static async Task <Transaction> CreateAsync(KeyPair transactionSourceAccount, Server server)
{
var transaction = new Transaction();
transaction._sourceAccountSeed = transactionSourceAccount.CanSign() ? transactionSourceAccount.SecretSeed : null;
transaction._account = await server.Accounts.Account(transactionSourceAccount.AccountId);
transaction.Builder = new TransactionBuilder(transaction._account);
return(transaction);
}