why no ann here? pseudo premine
"Cryptobits (CYB) is a new alt currency made for the Cryptocointalk forums." - MrPotatoHead (The dev)
I mentioned it earlier...hashrate has really picked up now
oy, you just said nothing. it's a pseudo premine because it was annoinced on a virtually empty forum, if it was announced here then when the following gre, moved to the other forum that would make sense. Essentially those who were in the know got to premine this crapcoin.
int64 static GetBlockValue(int nHeight, int64 nFees)
{
int64 nSubsidy = 2 * COIN;
if(nHeight == 2)
{
nSubsidy = 20000 * COIN;
}
nSubsidy >>= (nHeight / 1004000); // Approx 500 thousand blocks per year
return nSubsidy + nFees;
}
static const int64 nTargetTimespan = 5 * 120; // Cryptobits: 10mnute retarget days
static const int64 nTargetSpacing = 120; // Cryptobits: 2 minute blocks
static const int64 nInterval = nTargetTimespan / nTargetSpacing;
// Thanks: Balthazar for suggesting the following fix
//
https://bitcointalk.org/index.php?topic=182430.msg1904506#msg1904506static const int64 nReTargetHistoryFact = 4; // look at 4 times the retarget
// interval into the block history
//
// minimum amount of work that could possibly be required nTime after
// minimum work required was nBase
//
unsigned int ComputeMinWork(unsigned int nBase, int64 nTime)
{
// Testnet has min-difficulty blocks
// after nTargetSpacing*2 time between blocks:
if (fTestNet && nTime > nTargetSpacing*2)
return bnProofOfWorkLimit.GetCompact();
CBigNum bnResult;
bnResult.SetCompact(nBase);
while (nTime > 0 && bnResult < bnProofOfWorkLimit)
{
// Maximum 400% adjustment...
bnResult *= 4;
// ... in best-case exactly 4-times-normal target time
nTime -= nTargetTimespan*4;
}
if (bnResult > bnProofOfWorkLimit)
bnResult = bnProofOfWorkLimit;
return bnResult.GetCompact();
}
unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlock *pblock)
{
unsigned int nProofOfWorkLimit = bnProofOfWorkLimit.GetCompact();
// Genesis block
if (pindexLast == NULL)
return nProofOfWorkLimit;
// Only change once per interval
if ((pindexLast->nHeight+1) % nInterval != 0)
{
// Special difficulty rule for testnet:
if (fTestNet)
{
// If the new block's timestamp is more than 2* 10 minutes
// then allow mining of a min-difficulty block.
if (pblock->nTime > pindexLast->nTime + nTargetSpacing*2)
return nProofOfWorkLimit;
else
{
// Return the last non-special-min-difficulty-rules-block
const CBlockIndex* pindex = pindexLast;
while (pindex->pprev && pindex->nHeight % nInterval != 0 && pindex->nBits == nProofOfWorkLimit)
pindex = pindex->pprev;
return pindex->nBits;
}
}
return pindexLast->nBits;
}
// Litecoin: This fixes an issue where a 51% attack can change difficulty at will.
// Go back the full period unless it's the first retarget after genesis. Code courtesy of Art Forz
int blockstogoback = nInterval-1;
if ((pindexLast->nHeight+1) != nInterval)
blockstogoback = nInterval;
if (pindexLast->nHeight > COINFIX1_BLOCK) {
blockstogoback = nReTargetHistoryFact * nInterval;
}
// Go back by what we want to be nReTargetHistoryFact*nInterval blocks
const CBlockIndex* pindexFirst = pindexLast;
for (int i = 0; pindexFirst && i < blockstogoback; i++)
pindexFirst = pindexFirst->pprev;
assert(pindexFirst);
// Limit adjustment step
int64 nActualTimespan = 0;
if (pindexLast->nHeight > COINFIX1_BLOCK)
// obtain average actual timespan
nActualTimespan = (pindexLast->GetBlockTime() - pindexFirst->GetBlockTime())/nReTargetHistoryFact;
else
nActualTimespan = pindexLast->GetBlockTime() - pindexFirst->GetBlockTime();
printf(" nActualTimespan = %"PRI64d" before bounds\n", nActualTimespan);
if (nActualTimespan < nTargetTimespan/4)
nActualTimespan = nTargetTimespan/4;
if (nActualTimespan > nTargetTimespan*4)
nActualTimespan = nTargetTimespan*4;
// Retarget
CBigNum bnNew;
bnNew.SetCompact(pindexLast->nBits);
bnNew *= nActualTimespan;
bnNew /= nTargetTimespan;
if (bnNew > bnProofOfWorkLimit)
bnNew = bnProofOfWorkLimit;
/// debug print
printf("GetNextWorkRequired RETARGET\n");
printf("nTargetTimespan = %"PRI64d" nActualTimespan = %"PRI64d"\n", nTargetTimespan, nActualTimespan);
printf("Before: %08x %s\n", pindexLast->nBits, CBigNum().SetCompact(pindexLast->nBits).getuint256().ToString().c_str());
printf("After: %08x %s\n", bnNew.GetCompact(), bnNew.getuint256().ToString().c_str());
return bnNew.GetCompact();
}
this coin is dead if 3 people with at least a 20mh each farm point at it for more than an hour.
