/**
* Convert a $timestamp to a locktime.
* Max timestamp is 3794967296 - 04/04/2090 @ 5:34am (UTC)
*
* @param int|string $timestamp
* @return int|string
* @throws \Exception
*/
public function fromTimestamp($timestamp)
{
if ($this->math->cmp($timestamp, self::TIME_MAX) > 0) {
throw new \Exception('Timestamp out of range');
}
$locktime = $this->math->add(self::BLOCK_MAX, $timestamp);
return $locktime;
}
/**
* @param UtxoView $view
* @param TransactionInterface $tx
* @param int $spendHeight
* @return $this
*/
public function checkContextualInputs(UtxoView $view, TransactionInterface $tx, $spendHeight)
{
$valueIn = gmp_init(0);
for ($i = 0, $nInputs = count($tx->getInputs()); $i < $nInputs; $i++) {
/*if ($out->isCoinbase()) {
// todo: cb / height
if ($spendHeight - $out->getHeight() < $this->params->coinbaseMaturityAge()) {
return false;
}
}*/
$value = gmp_init($view->fetchByInput($tx->getInput($i))->getOutput()->getValue(), 10);
$valueIn = $this->math->add($valueIn, $value);
$this->consensus->checkAmount($valueIn);
}
$valueOut = gmp_init(0);
foreach ($tx->getOutputs() as $output) {
$valueOut = $this->math->add($valueOut, gmp_init($output->getValue(), 10));
$this->consensus->checkAmount($valueOut);
}
if ($this->math->cmp($valueIn, $valueOut) < 0) {
throw new \RuntimeException('Value-in is less than value-out');
}
$fee = $this->math->sub($valueIn, $valueOut);
$this->consensus->checkAmount($fee);
return $this;
}
/**
* @param Math $math
* @param TransactionInterface $transaction
* @return int|string
*/
public function getValueIn(Math $math, TransactionInterface $transaction)
{
$value = 0;
foreach ($transaction->getInputs() as $input) {
$value = $math->add($value, $this->fetchByInput($input)->getOutput()->getValue());
}
return $value;
}
/**
* @param BlockHeaderInterface[] $blocks
* @return int|string
*/
public function sumWork(array $blocks)
{
$work = 0;
foreach ($blocks as $header) {
$work = $this->math->add($this->getWork($header->getBits()), $work);
}
return $work;
}
/**
* @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 ChainState $state
* @param BlockInterface $block
* @param Headers $headers
* @param UtxoIdx $utxoIdx
* @return BlockIndex
*/
public function accept(ChainState $state, BlockInterface $block, Headers $headers, UtxoIdx $utxoIdx)
{
$bestBlock = $state->getLastBlock();
if ($bestBlock->getHash() !== $block->getHeader()->getPrevBlock()) {
throw new \RuntimeException('Blocks:accept() Block does not extend this chain!');
}
$index = $headers->accept($state, $block->getHeader());
$this->blockCheck->check($block)->checkContextual($block, $bestBlock);
//$view = $utxoIdx->fetchView($state, $block);
$view = $this->db->fetchUtxoView($block);
$flagP2sh = $this->consensus->scriptVerifyPayToScriptHash($bestBlock->getHeader()->getTimestamp());
$flags = new Flags($flagP2sh ? InterpreterInterface::VERIFY_P2SH : InterpreterInterface::VERIFY_NONE);
$nInputs = 0;
$nFees = 0;
$nSigOps = 0;
$txs = $block->getTransactions();
foreach ($block->getTransactions() as $tx) {
$nInputs += count($tx->getInputs());
$nSigOps += $this->blockCheck->getLegacySigOps($tx);
if ($nSigOps > $this->consensus->getParams()->getMaxBlockSigOps()) {
throw new \RuntimeException('Blocks::accept() - too many sigops');
}
if (!$tx->isCoinbase()) {
if ($flagP2sh) {
$nSigOps = $this->blockCheck->getP2shSigOps($view, $tx);
if ($nSigOps > $this->consensus->getParams()->getMaxBlockSigOps()) {
throw new \RuntimeException('Blocks::accept() - too many sigops');
}
}
$fee = $this->math->sub($view->getValueIn($this->math, $tx), $tx->getValueOut());
$nFees = $this->math->add($nFees, $fee);
$this->blockCheck->checkInputs($view, $tx, $index->getHeight(), $flags);
}
}
$this->blockCheck->checkCoinbaseSubsidy($txs[0], $nFees, $index->getHeight());
$this->db->insertBlock($block);
$state->updateLastBlock($index);
return $index;
}
/**
* @param BlockInterface $block
* @param BlockData $blockData
* @param bool $checkSignatures
* @param bool $flags
* @param $height
*/
public function checkBlockData(BlockInterface $block, BlockData $blockData, $checkSignatures, $flags, $height)
{
$validation = new ScriptValidation($checkSignatures, $flags);
foreach ($block->getTransactions() as $tx) {
$blockData->nSigOps += $this->blockCheck->getLegacySigOps($tx);
if ($blockData->nSigOps > $this->consensus->getParams()->getMaxBlockSigOps()) {
throw new \RuntimeException('Blocks::accept() - too many sigops');
}
if (!$tx->isCoinbase()) {
if ($flags & InterpreterInterface::VERIFY_P2SH) {
$blockData->nSigOps += $this->blockCheck->getP2shSigOps($blockData->utxoView, $tx);
if ($blockData->nSigOps > $this->consensus->getParams()->getMaxBlockSigOps()) {
throw new \RuntimeException('Blocks::accept() - too many sigops');
}
}
$blockData->nFees = $this->math->add($blockData->nFees, $blockData->utxoView->getFeePaid($this->math, $tx));
$this->blockCheck->checkInputs($blockData->utxoView, $tx, $height, $flags, $validation);
}
}
if ($validation->active() && !$validation->result()) {
throw new \RuntimeException('ScriptValidation failed!');
}
$this->blockCheck->checkCoinbaseSubsidy($block->getTransaction(0), $blockData->nFees, $height);
}
/**
* @param UtxoView $view
* @param TransactionInterface $tx
* @param $spendHeight
* @return bool
*/
public function checkContextualInputs(UtxoView $view, TransactionInterface $tx, $spendHeight)
{
$valueIn = 0;
for ($i = 0; $i < count($tx->getInputs()); $i++) {
$utxo = $view->fetchByInput($tx->getInput($i));
/*if ($out->isCoinbase()) {
// todo: cb / height
if ($spendHeight - $out->getHeight() < $this->params->coinbaseMaturityAge()) {
return false;
}
}*/
$value = $utxo->getOutput()->getValue();
$valueIn = $this->math->add($value, $valueIn);
if (!$this->consensus->checkAmount($valueIn) || !$this->consensus->checkAmount($value)) {
throw new \RuntimeException('CheckAmount failed for inputs value');
}
}
$valueOut = 0;
foreach ($tx->getOutputs() as $output) {
$valueOut = $this->math->add($output->getValue(), $valueOut);
if (!$this->consensus->checkAmount($valueOut) || !$this->consensus->checkAmount($output->getValue())) {
throw new \RuntimeException('CheckAmount failed for outputs value');
}
}
if ($this->math->cmp($valueIn, $valueOut) < 0) {
throw new \RuntimeException('Value-in is less than value out');
}
$fee = $this->math->sub($valueIn, $valueOut);
if ($this->math->cmp($fee, 0) < 0) {
throw new \RuntimeException('Fee is less than zero');
}
if (!$this->consensus->checkAmount($fee)) {
throw new \RuntimeException('CheckAmount failed for fee');
}
return true;
}
/**
* @param BufferInterface $hash
* @param BlockIndexInterface $prevIndex
* @param BlockHeaderInterface $header
* @return BlockIndex
*/
public function getNextIndex(BufferInterface $hash, BlockIndexInterface $prevIndex, BlockHeaderInterface $header)
{
return new BlockIndex($hash, $prevIndex->getHeight() + 1, $this->math->toString($this->math->add($this->proofOfWork->getWork($header->getBits()), gmp_init($prevIndex->getWork()))), $header);
}
