Example #1
0
        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;
            }
        }