/** * @return $this */ private function updateProofOfWork() { if ($this->math->cmp(0, $this->math->mod($this->currentHeight(), 2016)) == 0) { $this->chainDiff = $this->difficulty->getDifficulty($this->chainTip()->getHeader()->getBits()); $this->pow = new ProofOfWork($this->math, $this->difficulty, $this->chainDiff); } return $this; }
/** * @param TransactionInterface|null $coinbaseTx * @return Block * @throws \BitWasp\Bitcoin\Exceptions\MerkleTreeEmpty */ public function run(TransactionInterface $coinbaseTx = null) { $nonce = '0'; $maxNonce = $this->math->pow(2, 32); // Allow user supplied transactions if ($coinbaseTx == null) { $coinbaseTx = new Transaction(); $coinbaseTx->getInputs()->addInput(new TransactionInput('0000000000000000000000000000000000000000000000000000000000000000', 4294967295.0)); $coinbaseTx->getOutputs()->addOutput(new TransactionOutput(5000000000.0, $this->script)); } $inputs = $coinbaseTx->getInputs(); $found = false; $usingDiff = $this->lastBlockHeader->getBits(); $diff = new Difficulty($this->math); $target = $diff->getTarget($usingDiff); while (false === $found) { // Set coinbase script, and build Merkle tree & block header. $inputs->getInput(0)->setScript($this->getCoinbaseScriptBuf()); $transactions = new TransactionCollection(array_merge(array($coinbaseTx), $this->transactions->getTransactions())); $merkleRoot = new MerkleRoot($this->math, $transactions); $merkleHash = $merkleRoot->calculateHash(); $header = new BlockHeader($this->version, $this->lastBlockHeader->getBlockHash(), $merkleHash, $this->timestamp, $usingDiff, '0'); $t = microtime(true); // Loop through all nonces (up to 2^32). Restart after modifying extranonce. while ($this->math->cmp($header->getNonce(), $maxNonce) <= 0) { $header->setNonce($this->math->add($header->getNonce(), '1')); $hash = (new Parser())->writeBytes(32, Hash::sha256d($header->getBuffer()), true)->getBuffer(); if ($this->math->cmp($hash->getInt(), $target) <= 0) { $block = new Block($this->math, $header, $transactions); return $block; } if ($this->report && $this->math->cmp($this->math->mod($header->getNonce(), 100000), '0') == 0) { $time = microtime(true) - $t; $khash = $nonce / $time / 1000; echo "extraNonce[{$this->extraNonce}] nonce[{$nonce}] time[{$time}] khash/s[{$khash}] \n"; } } // Whenever we exceed 2^32, increment extraNonce and reset $nonce $this->extraNonce++; $nonce = '0'; } }
/** * @param int $nHashNum * @param BufferInterface $data * @return string */ public function hash($nHashNum, BufferInterface $data) { return $this->math->mod(Hash::murmur3($data, $nHashNum * self::TWEAK_START + $this->nTweak & 0xffffffff)->getInt(), count($this->vFilter) * 8); }