public static CheckStakeResult CheckStakeKernelHash(MintTemplate template, uint txTime,
ulong stakeModifier, uint stakeMinAge)
{
var retobj = new CheckStakeResult
{
Id = template.Id,
OfAddress = template.OfAddress,
StakeModifier = stakeModifier,
BlockFromTime = template.BlockFromTime,
PrevTxOffset = template.PrevTxOffset,
PrevTxTime = template.PrevTxTime,
PrevTxOutIndex = template.PrevTxOutIndex,
FutureTimestamp = txTime,
};
if (txTime < template.PrevTxTime)
{
// Transaction timestamp violation
return(retobj);
}
if (template.BlockFromTime + stakeMinAge > txTime)
{
// Min age requirement
return(retobj);
}
var bnTargetPerCoinDay = Mint.CompactToBig(template.Bits !.Value);
long nTimeWeight = txTime - template.PrevTxTime;
if (nTimeWeight > PeercoinConstants.StakeMaxAge)
{
nTimeWeight = PeercoinConstants.StakeMaxAge;
}
long timeReduction = stakeMinAge;
nTimeWeight -= timeReduction;
var t1 = new BigInteger(24 * 60 * 60);
var t2 = new BigInteger(PeercoinConstants.Coin);
var t3 = new BigInteger(template.PrevTxOutValue);
var t4 = new BigInteger(nTimeWeight);
BigInteger bnCoinDayWeight = (((t3 * t4) / t2)) / t1;
BigInteger targetInt = bnCoinDayWeight * (bnTargetPerCoinDay);
//byte[] array = new byte[28];
var buffer = new byte[28];
var bufferindex = 0;
byte[] arrStakemodifier = BitConverter.GetBytes(stakeModifier);
//put stakemodifier in buffer
for (var i = 0; i < 8; i++)
{
buffer[bufferindex] = arrStakemodifier[i];
bufferindex++;
}
new List <uint>
{
(uint)template.BlockFromTime, (uint)template.PrevTxOffset, (uint)template.PrevTxTime,
(uint)template.PrevTxOutIndex, (uint)txTime
}
.ForEach(num =>
{
var dn = num;
for (var i = 0; i < 4; i++)
{
buffer[bufferindex] = (byte)(dn & 0xff);
dn >>= 8;
bufferindex++;
}
});
//no reverse so keep it in little endian
var hashProofOfStake = Mint.DoubleSha256(buffer.ToList()).ToArray(); //keep it in little-endian .Reverse().ToArray();
//add zero to last in array to make it unsigned:
// https://docs.microsoft.com/en-us/dotnet/api/system.numerics.biginteger.-ctor?view=netframework-4.5.2#System_Numerics_BigInteger__ctor_System_Byte___
var lastindex = hashProofOfStake.Length - 1;
if ((hashProofOfStake[lastindex] & 0x80) > 0)
{
byte[] temp = new byte[hashProofOfStake.Length];
Array.Copy(hashProofOfStake, temp, hashProofOfStake.Length);
hashProofOfStake = new byte[temp.Length + 1];
Array.Copy(temp, hashProofOfStake, temp.Length);
}
var hashProofOfStakeInt = new BigInteger(hashProofOfStake);
if (hashProofOfStakeInt > targetInt)
{
return(retobj);
}
//yeah, below target!
retobj.minTarget = (hashProofOfStakeInt / bnCoinDayWeight) - new BigInteger(1);
retobj.success = true;
retobj.hash = hashProofOfStake;
retobj.Id = template.Id;
var comp = Mint.IncCompact(
Mint.BigToCompact(retobj.minTarget)
);
retobj.minimumDifficulty = Mint.CompactToDiff(comp);
return(retobj);
}
public static async Task FindStakes(BlockChainParser parser, List <UnspentTransactionData> unspents)
{
foreach (var unspent in unspents)
{
unspent.blockhash = await parser.GetBlockHash(unspent.txid);
unspent.blockheight = await parser.Parse(unspent.blockhash);
await parser.Parse(unspent.blockhash);
var block = _blockRepository !.GetBlockState(unspent.blockheight);
unspent.blocktime = block !.bt;
var output = _transactionRepository !.GetOutput(unspent.txid, unspent.vout);
unspent.units = output !.units;
}
// set negative if expecting a slight increase in POS diff in future:
var minMarginDifficulty = -0.35f;
var templates = new List <MintTemplate>();
var addresses = unspents.Select(un => un.address)
.Distinct()
.ToList();
foreach (var address in addresses)
{
var unspentsbyaddress = _transactionRepository !.GetUnspents(address)
.Where(unspent => unspents.Any(u => u.txid == unspent.Id !.Substring(2, 64) && u.vout.ToString() == unspent.Id.Substring(67)))
.ToList();
unspentsbyaddress.ForEach(unspent =>
{
var mintTemplate = new MintTemplate(
unspent.Id,
address,
unspent.BlockFromTime,
unspent.PrevTxOffset,
unspent.PrevTxTime,
unspent.PrevTxOutIndex,
unspent.PrevTxOutValue);
mintTemplate.SetBitsWithDifficulty(((Convert.ToSingle(PosDifficulty) - minMarginDifficulty)));
if (templates.All(t => t.Id != mintTemplate.Id))
{
templates.Add(mintTemplate);
}
});
}
//load modifiers:
// start with a block way back assuming there are 6 blocks in an hour:
// see also: consensus.nStakeTargetSpacing = 10 * 60; // 10-minute block spacing
var start = BlockHeight - (6 * 24 * 31) - 10;
var end = BlockHeight;
for (var i = start; i < end; i++)
{
await parser.Parse(i);
}
var futurestakes = await StartSearch(templates);
ExitWithJson(null, futurestakes);
}
