/**
* Produce a block locator for a given block height.
* @param int $height
* @param Buffer|null $final
* @return BlockLocator
*/
public function getLocator($height, Buffer $final = null)
{
$step = 1;
$hashes = [];
$headerHash = $this->chain->getHashFromHeight($height);
while (true) {
$hashes[] = $headerHash;
if ($height === 0) {
break;
}
$height = max($height - $step, 0);
$headerHash = $this->chain->getHashFromHeight($height);
if (count($hashes) >= 10) {
$step *= 2;
}
}
if (null === $final) {
$hashStop = new Buffer('', 32);
} else {
$hashStop = $final;
}
return new BlockLocator($hashes, $hashStop);
}
