protected virtual (Share Share, string BlockHex) ProcessShareInternal(StratumClient worker, string nonce,
uint nTime, string solution)
{
var context = worker.ContextAs <BitcoinWorkerContext>();
var solutionBytes = solution.HexToByteArray();
// serialize block-header
var headerBytes = SerializeHeader(nTime, nonce); // 144 bytes (doesn't contain soln)
// verify solution
if (!equihash.Verify(headerBytes, solutionBytes.Skip(chainConfig.SolutionPreambleSize).ToArray())) // skip preamble (3 bytes)
{
throw new StratumException(StratumError.Other, "invalid solution");
}
// hash block-header
var headerSolutionBytes = headerBytes.Concat(solutionBytes).ToArray();
Span <byte> headerHash = stackalloc byte[32];
headerHasher.Digest(headerSolutionBytes, headerHash, (ulong)nTime);
var headerValue = new uint256(headerHash);
// calc share-diff
var shareDiff = (double)new BigRational(chainConfig.Diff1b, headerHash.ToBigInteger()) * shareMultiplier;
var stratumDifficulty = context.Difficulty;
var ratio = shareDiff / stratumDifficulty;
// check if the share meets the much harder block difficulty (block candidate)
var isBlockCandidate = headerValue <= blockTargetValue;
// test if share meets at least workers current difficulty
if (!isBlockCandidate && ratio < 0.99)
{
// check if share matched the previous difficulty from before a vardiff retarget
if (context.VarDiff?.LastUpdate != null && context.PreviousDifficulty.HasValue)
{
ratio = shareDiff / context.PreviousDifficulty.Value;
if (ratio < 0.99)
{
throw new StratumException(StratumError.LowDifficultyShare, $"low difficulty share ({shareDiff})");
}
// use previous difficulty
stratumDifficulty = context.PreviousDifficulty.Value;
}
else
{
throw new StratumException(StratumError.LowDifficultyShare, $"low difficulty share ({shareDiff})");
}
}
var result = new Share
{
BlockHeight = BlockTemplate.Height,
NetworkDifficulty = Difficulty,
Difficulty = stratumDifficulty,
};
if (isBlockCandidate)
{
var headerHashReversed = headerHash.ToNewReverseArray();
result.IsBlockCandidate = true;
result.BlockReward = rewardToPool.ToDecimal(MoneyUnit.BTC);
result.BlockHash = headerHashReversed.ToHexString();
var blockBytes = SerializeBlock(headerBytes, coinbaseInitial, solutionBytes);
var blockHex = blockBytes.ToHexString();
return(result, blockHex);
}
return(result, null);
}
protected virtual (Share Share, string BlockHex) ProcessShareInternal(StratumClient worker, string extraNonce,
uint nTime, string nonce, string solution)
{
var context = worker.ContextAs <BitcoinWorkerContext>();
var solutionBytes = solution.HexToByteArray();
var extraNonceBytes = extraNonce.HexToByteArray();
var nonceInt = uint.Parse(nonce, NumberStyles.HexNumber);
// serialize block-header
var headerBytes = SerializeHeader(nTime, extraNonceBytes, nonceInt);
// verify solution
if (!equihash.Verify(headerBytes, solutionBytes))
{
throw new StratumException(StratumError.Other, "invalid solution");
}
// hash block-header
var headerSolutionBytes = headerBytes.Concat(solutionBytes).ToArray();
var headerHash = headerHasher.Digest(headerSolutionBytes);
var headerValue = new uint256(headerHash);
// calc share-diff
double shareDiff = (double)new BigRational(chainConfig.Diff1b, headerHash.ToBigInteger());
var stratumDifficulty = context.Difficulty;
var ratio = shareDiff / stratumDifficulty;
// check if the share meets the much harder block difficulty (block candidate)
var isBlockCandidate = headerValue < blockTarget.ToUInt256();
// test if share meets at least workers current difficulty
if (!isBlockCandidate && ratio < 0.99)
{
// check if share matched the previous difficulty from before a vardiff retarget
if (context.VarDiff?.LastUpdate != null && context.PreviousDifficulty.HasValue)
{
ratio = shareDiff / context.PreviousDifficulty.Value;
if (ratio < 0.99)
{
throw new StratumException(StratumError.LowDifficultyShare, $"low difficulty share ({shareDiff})");
}
// use previous difficulty
stratumDifficulty = context.PreviousDifficulty.Value;
}
else
{
throw new StratumException(StratumError.LowDifficultyShare, $"low difficulty share ({shareDiff})");
}
}
var result = new Share
{
BlockHeight = BlockHeader.Height,
NetworkDifficulty = Difficulty,
Difficulty = stratumDifficulty,
};
if (isBlockCandidate)
{
result.IsBlockCandidate = true;
result.BlockHash = headerValue.ToString();
var blockHex = headerSolutionBytes.ToHexString();
return(result, blockHex);
}
return(result, null);
}
