void IBroadcaster.BroadcastTransaction(Transaction tx)
{
_eventAggregator.Publish(new TxBroadcastEvent {
Tx = tx
});
_logger.LogDebug($"Broadcasting transaction {tx.ToHex()}");
_client.Broadcast(tx);
}
void IBroadcaster.BroadcastTransaction(Transaction tx)
{
_logger.LogDebug($"Broadcasting transaction {tx.ToHex()}");
_client.Broadcast(tx);
}
public static void Execute()
{
// To setup NBXplorer's, you need a fully synced bitcoind node with default parameters.
// Then clone and run NBXplorer with default parameters.
// Reference the NBXplorer.Client nuget package then you need to notify the NBXplorer
// to track the user wallet:
var network = new NBXplorerNetworkProvider(NetworkType.Mainnet).GetBTC();
var userExtKey = new ExtKey();
var userDerivationScheme = network.DerivationStrategyFactory.CreateDirectDerivationStrategy(userExtKey.Neuter(), new DerivationStrategyOptions()
{
// Use non-segwit
Legacy = true
});
ExplorerClient client = new ExplorerClient(network);
client.Track(userDerivationScheme);
// query the UTXOs of your user and spend them the following way
var utxos = client.GetUTXOs(userDerivationScheme, null, false);
// If you want to spend those UTXOs:
var coins = utxos.GetUnspentCoins();
var keys = utxos.GetKeys(userExtKey);
var changeAddress = new Key();
TransactionBuilder builder = new TransactionBuilder();
builder.AddCoins(coins)
.AddKeys(keys)
.Send(new Key(), Money.Coins(0.5m))
.SetChange(changeAddress.ScriptPubKey);
// Set the fee rate
var fallbackFeeRate = new FeeRate(Money.Satoshis(100), 1);
var feeRate = client.GetFeeRate(1, fallbackFeeRate).FeeRate;
builder.SendEstimatedFees(feeRate);
/////
var tx = builder.BuildTransaction(sign: true);
Console.WriteLine(client.Broadcast(tx));
// To prevent this problem of broadcasting the same transaction twice,
// you need to make sure to not spend twice the same coins.
// A way to solve the problem is by simply retrying:
while (true)
{
coins = utxos.GetUnspentCoins();
keys = utxos.GetKeys(userExtKey);
builder = new TransactionBuilder();
builder.AddCoins(coins)
.AddKeys(keys)
.Send(new Key(), Money.Coins(0.5m))
.SetChange(changeAddress.ScriptPubKey);
// Set the fee rate
fallbackFeeRate = new FeeRate(Money.Satoshis(100), 1);
feeRate = client.GetFeeRate(1, fallbackFeeRate).FeeRate;
builder.SendEstimatedFees(feeRate);
/////
tx = builder.BuildTransaction(true);
var result = client.Broadcast(tx);
if (result.Success)
{
Console.WriteLine("Success!");
break;
}
else if (result.RPCCode.HasValue && result.RPCCode.Value == RPCErrorCode.RPC_TRANSACTION_REJECTED)
{
Console.WriteLine("We probably got a conflict, let's try again!");
continue;
}
else
{
Console.WriteLine($"Something is really wrong {result.RPCCode} {result.RPCCodeMessage} {result.RPCMessage}");
// Do something!!!
}
}
// Another common way is to have a global list of already used outpoint that you can check against.
}