/**
* @param BlockIndexInterface $prevIndex
* @param int $timeFirstBlock
* @return int
*/
public function calculateNextWorkRequired(BlockIndexInterface $prevIndex, $timeFirstBlock)
{
$header = $prevIndex->getHeader();
$math = $this->math;
$timespan = $this->calculateWorkTimespan($timeFirstBlock, $header);
$negative = false;
$overflow = false;
$target = $math->decodeCompact($header->getBits(), $negative, $overflow);
$limit = $this->math->decodeCompact($this->params->powBitsLimit(), $negative, $overflow);
$new = gmp_init(bcdiv(bcmul($target, $timespan), $this->params->powTargetTimespan()), 10);
if ($math->cmp($new, $limit) > 0) {
$new = $limit;
}
return gmp_strval($math->encodeCompact($new, false), 10);
}
