private async Task <BtcTxnSignature> getBtcTxnSignaturesAsync(
ECurrency currency,
string address,
string amount,
string fee,
string target,
string reserve,
string reservedFundsRedeemScript,
string privateKey
)
{
GluwaClient client = new GluwaClient(mEnv);
Result <BalanceResponse, ErrorResponse> getUnspentOutput = await client.GetBalanceAsync(currency, address, true);
List <UnspentOutput> unspentOutputs = getUnspentOutput.Data.UnspentOutputs.OrderByDescending(u => u.Amount).ToList();
Money amountValue = Money.Parse(amount);
Money feeValue = Money.Parse(fee);
Money reserveAmount = amountValue + feeValue;
Money totalRequiredAmountMoney = reserveAmount + feeValue;
BigInteger totalRequiredAmount = new BigInteger(totalRequiredAmountMoney.Satoshi);
BitcoinAddress sourceAddress = BitcoinAddress.Create(address, mEnv.Network);
BitcoinAddress targetAddress = BitcoinAddress.Create(target, mEnv.Network);
BitcoinAddress reserveAddress = BitcoinAddress.Create(reserve, mEnv.Network);
BitcoinSecret secret = new BitcoinSecret(privateKey, mEnv.Network);
List <UnspentOutput> usingUnspentOutputs = new List <UnspentOutput>();
BigInteger unspentOutputTotalAmount = BigInteger.Zero;
for (int i = 0; i < unspentOutputs.Count; i++)
{
if (unspentOutputTotalAmount < totalRequiredAmount && i >= MAX_UNSPENTOUTPUTS_COUNT)
{
throw new InvalidOperationException($"Could not find up to {MAX_UNSPENTOUTPUTS_COUNT} BTC unspent outputs that can cover the amount and fee.");
}
if (unspentOutputTotalAmount >= totalRequiredAmount)
{
break;
}
usingUnspentOutputs.Add(unspentOutputs[i]);
Money sumAmount = Money.Parse(unspentOutputs[i].Amount);
unspentOutputTotalAmount += new BigInteger(sumAmount.Satoshi);
}
List <Coin> coins = new List <Coin>();
for (int i = 0; i < usingUnspentOutputs.Count; i++)
{
coins.Add(new Coin(
fromTxHash: new uint256(usingUnspentOutputs[i].TxHash),
fromOutputIndex: (uint)usingUnspentOutputs[i].Index,
amount: usingUnspentOutputs[i].Amount,
scriptPubKey: Script.FromHex(sourceAddress.ScriptPubKey.ToHex())
));
}
TransactionBuilder builder = mEnv.Network.CreateTransactionBuilder();
NBitcoin.Transaction reserveTxSignature = builder
.AddKeys(secret)
.AddCoins(coins)
.Send(reserveAddress, reserveAmount)
.SetChange(sourceAddress)
.SendFees(fee)
.BuildTransaction(true);
IEnumerable <Coin> reserveTxCoins = reserveTxSignature.Outputs.AsCoins();
Coin reserveTxCoin = reserveTxCoins.First(
c => c.TxOut.ScriptPubKey.GetDestinationAddress(mEnv.Network) == reserveAddress);
Script reservedFundsRedeemScriptValue = new Script(reservedFundsRedeemScript);
ScriptCoin reservedCoin = new ScriptCoin(reserveTxCoin, reservedFundsRedeemScriptValue);
builder = mEnv.Network.CreateTransactionBuilder();
PSBT executePsbt = builder
.AddKeys(secret)
.AddCoins(reservedCoin)
.Send(targetAddress, amount)
.SendFees(feeValue)
.SetChange(reserveAddress)
.BuildPSBT(true);
builder = mEnv.Network.CreateTransactionBuilder();
PSBT reclaimPsbt = builder
.AddKeys(secret)
.AddCoins(reservedCoin)
.Send(sourceAddress, amount)
.SendFees(feeValue)
.SetChange(reserveAddress)
.BuildPSBT(true);
BtcTxnSignature bTCTxnSignature = new BtcTxnSignature()
{
ReserveTxnSignature = reserveTxSignature.ToHex(),
ExecuteTxnSignature = executePsbt.ToHex(),
ReclaimTxnSignature = reclaimPsbt.ToHex()
};
return(bTCTxnSignature);
}