public DC.Common.Models.UnspentResponse GetUnspentTxns(String address)
{
String url = String.Format("https://blockchain.info/unspent?active={0}", address);
WebRequest request = WebRequest.Create(url);
//request.UseDefaultCredentials = true;
try
{
using (Stream objStream = request.GetResponse().GetResponseStream())
{
if (objStream != null)
{
DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof(DC.Common.Models.UnspentResponse));
DC.Common.Models.UnspentResponse response = (DC.Common.Models.UnspentResponse)jsonSerializer.ReadObject(objStream);
//TODO, ORDER BY
return(response);
}
else
{
return(null);
}
}
}
catch (Exception ex)
{
//An internal server error is thrown here usually because there are no free outputs to spend
throw new InvalidOperationException("There are insufficient cleared funds for this transaction. Please try again later", ex);
}
}
public int GetConfirmations(string publicKey)
{
if (!String.IsNullOrEmpty(publicKey))
{
try
{
DC.Common.Models.UnspentResponse utxoResponse = Helpers.Factory.GetTransactionProvider().GetUnspentTxns(publicKey);
//Get unspent txs, largest to smallest
IEnumerable <DC.Common.Models.UnspentOutput> outputs = (from u in utxoResponse.UnspentOutputs
where u.Confirmations > 0
select u).OrderByDescending(u => u.Value);
if (outputs.Count() > 0)
{
return(outputs.First().Confirmations);
}
else
{
return(0);
}
}
catch
{
//Returns
return(0);
}
}
else
{
throw new ArgumentException("Public Key cannot be null");
}
}
/// <summary>
/// Sign and send bitcoins using bitcoin core
/// </summary>
/// <param name="privateKey">Private key as decimal</param>
/// <param name="sourceAddress">Bitcoin address to receive change</param>
/// <param name="destinationAddress"></param>
/// <param name="amount"></param>
private String SignAndTransfer(String privateKey, String destinationAddress, Decimal amount)
{
DC.Common.Models.Address sourceAddress = new Common.Models.Address(privateKey);
DC.Common.Models.UnspentResponse utxoResponse = Helpers.Factory.GetTransactionProvider().GetUnspentTxns
(sourceAddress.BTCAddress);
Decimal fee = Convert.ToDecimal(ConfigurationManager.AppSettings["fee"]);
fee = 0.0001M;
//Get unspent txs, largest to smallest
IEnumerable <DC.Common.Models.UnspentOutput> outputs = (from u in utxoResponse.UnspentOutputs
where u.Confirmations > 0
select u).OrderByDescending(u => u.Value);
//There needs to be sufficient balance for the amount plus the fee
Int64 target = Convert.ToInt64((amount + fee) * DC.Common.Math.SATOSHI);
if (outputs.Count() > 0)
{
bool sufficientFunds = false;
IList <DC.Common.Models.UnspentOutput> outputsToSpend = new List <Common.Models.UnspentOutput>();
foreach (DC.Common.Models.UnspentOutput output in outputs)
{
outputsToSpend.Add(output);
Int64 i = outputsToSpend.Sum(o => o.Value);
if (i >= target)
{
sufficientFunds = true;
break;
}
}
if (!sufficientFunds)
{
string message;
if (outputsToSpend.Sum(o => o.Value) == amount * DC.Common.Math.SATOSHI)
{
message = "There are insufficient funds to cover the transaction amount plus the bitcoin miner fee of 0.0001 Bitcoin";
}
else
{
message = "There are insufficient funds to complete this transaction";
}
throw new InvalidOperationException(message);
}
DC.Providers.IAddress provider = new DC.Providers.BlockChainInfo();
String destinationHash160 = provider.GetHash160(destinationAddress);
Helpers.Transaction Transaction = new Helpers.Transaction(outputsToSpend, sourceAddress, destinationAddress, destinationHash160, amount, fee);
Byte[] signedTransaction = Transaction.CreateAndSignTransaction(sourceAddress, destinationAddress, destinationHash160, amount, fee);
String signature = DC.Common.StringHelper.ByteArrayToHexString(signedTransaction);
// Providers.IWallet wallet = Helpers.Factory.GetWallet();
Providers.IWallet wallet = new Providers.BlockChainInfo()
{
MerchantId = "4ea10592-e7cb-4170-9b5b-6e94e3236bb1", Password = "******"
}; //ADD YOUR BLOCK CHAIN INFO CREDS HERE!
String txnHash = wallet.SendRawTransaction(signature);
return(txnHash);
}
else
{
throw new ArgumentException("The address does not have any unspent transactions");
}
}
