public static BlockHeader MineBlockHeader(BlockHeader blockHeader, UInt256 hashTarget)
{
var blockHeaderBytes = DataCalculator.EncodeBlockHeader(blockHeader);
var hashTargetBytes = hashTarget.ToByteArray();
var start = 0;
var finish = UInt32.MaxValue;
var total = 0L;
var nonceIndex = 76;
var minedNonce = (UInt32?)null;
//Debug.WriteLine("Starting mining: {0}".Format2(DateTime.Now.ToString("hh:mm:ss")));
var stopwatch = new Stopwatch();
stopwatch.Start();
Parallel.For(
start, finish,
() => new LocalMinerState(blockHeaderBytes),
(nonceLong, loopState, localState) =>
{
localState.total++;
var nonce = (UInt32)nonceLong;
var nonceBytes = Bits.GetBytes(nonce);
Buffer.BlockCopy(nonceBytes, 0, localState.headerBytes, nonceIndex, 4);
var headerBytes = localState.headerBytes;
var sha256 = localState.sha256;
var hashBytes = sha256.ComputeHash(sha256.ComputeHash(headerBytes));
if (BytesCompareLE(hashBytes, hashTargetBytes) < 0)
{
minedNonce = nonce;
loopState.Break();
}
return localState;
},
localState => { Interlocked.Add(ref total, localState.total); });
stopwatch.Stop();
var hashRate = ((float)total / 1000 / 1000) / ((float)stopwatch.ElapsedMilliseconds / 1000);
if (minedNonce != null)
{
//Debug.WriteLine("Found block in {0} hh:mm:ss at Nonce {1}, Hash Rate: {2} mHash/s, Total Hash Attempts: {3}, Found Hash: {4}".Format2(stopwatch.Elapsed.ToString(@"hh\:mm\:ss"), minedNonce, hashRate, total.ToString("#,##0"), blockHeader.With(Nonce: minedNonce).Hash));
return blockHeader.With(Nonce: minedNonce);
}
else
{
//Debug.WriteLine("No block found in {0} hh:mm:ss, Hash Rate: {1} mHash/s, Total Hash Attempts: {2}, Found Hash: {3}".Format2(stopwatch.Elapsed.ToString(@"hh\:mm\:ss"), hashRate, total.ToString("#,##0"), blockHeader.With(Nonce: minedNonce).Hash));
return null;
}
}