In reality, some organization may require more than 1 director's cheque signature in order to release the fund. Same thing accomplish this in bitcoin is using MULTISIG mechanism.
<?php
use BitWasp\Bitcoin\Bitcoin;
use BitWasp\Buffertools\Buffer;
use BitWasp\Bitcoin\Network\NetworkFactory;
use BitWasp\Bitcoin\Key\Factory\PrivateKeyFactory;
use BitWasp\Bitcoin\Address\AddressCreator;
use BitWasp\Bitcoin\Address\ScriptHashAddress;
use BitWasp\Bitcoin\Transaction\Factory\TxBuilder;
use BitWasp\Bitcoin\Transaction\TransactionFactory;
use BitWasp\Bitcoin\Transaction\TransactionOutput;
use BitWasp\Bitcoin\Transaction\Factory\Signer;
use BitWasp\Bitcoin\Transaction\Factory\SignData;
use BitWasp\Bitcoin\Script\ScriptType;
use BitWasp\Bitcoin\Script\ScriptFactory;
use BitWasp\Bitcoin\Script\Classifier\OutputClassifier;
use BitWasp\Bitcoin\Script\ScriptInfo\Multisig;
use BitWasp\Bitcoin\Script\P2shScript;
include_once "../libraries/vendor/autoload.php";
$noOfInputs = 10;
$noOfOutputs = 1;
if ($_SERVER['REQUEST_METHOD'] == 'GET' AND $_GET['ajax'] == '1') {
$data = [];
if ($_GET['action'] == 'load_utx') {
if (!ctype_xdigit($_GET['utx'])) {
$data = ["error"=>"UTX must be hex."];
} else {
$utxHex = $_GET['utx'];
$utx = TransactionFactory::fromHex($utxHex);
$outputs = $utx->getOutputs();
$data['txHash'] = $utx->getTxHash()->flip()->getHex();//swap endianess
$data['outputs'] = [];
if (@count($outputs)) {
foreach($outputs as $k=>$output) {
if ($k < 10) { //limit to retrieve max 10 inputs only
$decodeScript = (new OutputClassifier())->decode($output->getScript());
$reqSigs = -1;
if ($decodeScript->getType() == ScriptType::P2SH) {
$type = "p2sh.multisig";
} else if ($decodeScript->getType() == ScriptType::MULTISIG) {
$type = "p2ms";
$multiSig = Multisig::fromScript($output->getScript());
$reqSigs = $multiSig->getRequiredSigCount();
} else {
$data = ["error"=>"Load fail! Your unspent transaction output (utxo) can only contain P2SH or P2MS ScriptPubKey."];
break;
}
$data['outputs'][] = ["amount"=>$output->getValue(), "n"=>$k, "scriptPubKey"=>$output->getScript()->getHex(), "type"=>$type,'reqSigs'=>$reqSigs];
}
}
}
}
} else if ($_GET['action'] == 'load_redeemscript') {
if (!ctype_xdigit($_GET['redeemscript'])) {
$errmsg .= "Redeem script must be hex.";
} else if (!ctype_xdigit($_GET['scriptpubkey'])) {
$errmsg .= "Redeem script must be hex.";
} else {
$redeemScript = ScriptFactory::fromHex($_GET['redeemscript']);
$p2sh = new ScriptHashAddress($redeemScript->getScriptHash());
$scriptPubKeyFromRS = $p2sh->getScriptPubKey()->getHex();
if ($scriptPubKeyFromRS != $_GET['scriptpubkey']) {
$errmsg .= "Redeem script not match to UTXO ScriptPubKey.";
} else {
$decodeScript = (new OutputClassifier())->decode($redeemScript);
if ($decodeScript->getType() != ScriptType::MULTISIG) {
$errmsg .= "Redeem script is not MULTISIG script.";
} else {
$multiSig = Multisig::fromScript($redeemScript);
$reqSigs = $multiSig->getRequiredSigCount();
$data = ['reqSigs' => $reqSigs];
}
}
}
if ($errmsg) {
$data = ["error"=>$errmsg];
}
}
die(json_encode($data));
}
include_once("html_iframe_header.php");
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
try {
$networkClass = $_POST['network'];
Bitcoin::setNetwork(NetworkFactory::$networkClass());
$network = Bitcoin::getNetwork();
$ecAdapter = Bitcoin::getEcAdapter();
$privKeyFactory = new PrivateKeyFactory();
$addrCreator = new AddressCreator();
$spendTx = TransactionFactory::build();
$signItems = [];
if (!strlen($_POST['utx']) or !ctype_xdigit($_POST['utx'])) {
throw new Exception("UTX must be hex.");
}
if (!is_numeric($_POST['no_of_inputs']) OR !is_numeric($_POST['no_of_outputs'])) {
throw new Exception("Error in 'no_of_inputs' or 'no_of_outputs'.");
}
$utxHex = $_POST['utx'];
$utx = TransactionFactory::fromHex($utxHex);
$utxos = $utx->getOutputs();
foreach($utxos as $k=>$utxo) {
$spendTx = $spendTx->spendOutputFrom($utx, $k);
$privkeyhexCount = count($_POST["privkey_" . ($k+1)]);
$utxo_script = $utxo->getScript()->getHex();
$redeemScript = $_POST["redeemscript_" . ($k+1)];
if ($privkeyhexCount > 0) {
if (strlen($redeemScript) > 0) { //p2sh.multisig
$redeemScript = new P2shScript(ScriptFactory::fromHex($redeemScript));
$signData = new SignData();
$signData->p2sh($redeemScript);
for($i=0; $i<$privkeyhexCount; $i++) {
$signItems[] = [ $_POST["privkey_" . ($k+1)][$i], $utxo_script, $k, $signData];
}
} else {
for($i=0; $i<$privkeyhexCount; $i++) {
$signItems[] = [ $_POST["privkey_" . ($k+1)][$i], $utxo_script, $k];
}
}
}
}
foreach(range(1,$_POST['no_of_outputs']) as $thisOutput) {
$address = trim($_POST["address_{$thisOutput}"]);
$amount = trim($_POST["amount_{$thisOutput}"]);
if (strlen($address)>0 AND strlen($amount)>0) {
$recipient = $addrCreator->fromString($address);
$spendTx = $spendTx->payToAddress($amount, $recipient);
} else {
throw new Exception("Error in 'output#{$thisOutput}'.");
}
}
$thisTx = $spendTx->get();
$signer = new Signer($thisTx, $ecAdapter);
foreach($signItems as $nIn=>$signItem) {
$privateKey = $privKeyFactory->fromHexCompressed($signItem[0]);
$scriptPubKey = ScriptFactory::fromHex($signItem[1]);
$nIn = $signItem[2];
$signData = $signItem[3];
$txOutput = new TransactionOutput(0, $scriptPubKey );
$signer = $signer->sign($nIn, $privateKey, $txOutput,$signData);
}
?>
<div class="alert alert-success">
<h6 class="mt-3">Final TX Hex</h6>
<textarea class="form-control" rows="5" id="comment" readonly><?php echo $signer->get()->getHex();?></textarea>
</div>
<?php
} catch (Exception $e) {
$errmsg .= "Problem found. " . $e->getMessage();
}
}
if ($errmsg) {
?>
<div class="alert alert-danger">
<strong>Error!</strong> <?php echo $errmsg?>
</div>
<?php
}
?>
<form action='' method='post'>
<div class="form-group">
<label for="network">Network: </label>
<select name="network" id="network" class="form-control">
<?php
$networks = get_class_methods(new NetworkFactory());
foreach($networks as $network) {
echo "<option value='{$network}'".($network == $_POST['network'] ? " selected": "").">{$network}</option>";
}
?>
</select>
</div>
<div class="form-group">
<label for="utx">Unspent Transaction (Hex):</label>
<div class="input-group mb-3">
<input class="form-control" type='text' name='utx' id='utx' value='<?php echo $_POST['utx']?>'>
<div class="input-group-append">
<input class="btn btn-success" type="button" value="Load" onclick="
var self = $(this);
self.val('......');
var form = self.closest('form');
var allInputDivs = form.find('div[id^=row_input_]');
var allInputs = $( ':input', allInputDivs );
allInputs.val('');
allInputDivs.hide();
$('select#no_of_inputs',form).empty();
$('span#total_inputs',form).html('0');
$.ajax({
url: '?ajax=1&action=load_utx&utx=' + $('input#utx',form).val(),
success:function(result){
try {
j = eval('(' + result + ')');
if ('error' in j && j.error.length>0) {
var error = true;
} else {
var error = false;
}
if (!error) {
var txHash = j.txHash;
var outputs = j.outputs;
var totalInputs = 0;
if (outputs.length > 0) {
$('select#no_of_inputs',form).prepend('<option value=\''+outputs.length+'\' selected=\'selected\'>'+outputs.length+'</option>');
var x;
for (x in outputs) {
var divid = parseInt(x) + 1;
var amount = parseInt(outputs[x].amount);
var reqSigs = parseInt(outputs[x].reqSigs);
var type = outputs[x].type;
totalInputs += amount;
$('div#row_input_' + divid ,form).show();
$('input[name=utxo_hash_' + divid+']' ,form).val(txHash);
$('input[name=utxo_n_' + divid+']' ,form).val(outputs[x].n);
$('input[name=utxo_script_' + divid+']',form).val(outputs[x].scriptPubKey);
$('input[name=utxo_amount_' + divid+']',form).val(amount);
var privKeySelector = $('input[name=\'privkey_'+divid+'[]\']' ,form);
var firstPrivKeyInput = privKeySelector.filter(':first');
privKeySelector.not(':first').remove();
if (type == 'p2ms') {
firstPrivKeyInput.removeAttr('readonly');
reqSigs--;
if (reqSigs > 0) {
for(var i=0; i<reqSigs;i++) {
firstPrivKeyInput.closest('div').append(firstPrivKeyInput.clone());
}
}
$('input[name=redeemscript_' + divid+']',form).parent('div').parent('div').hide();
} else {
$('input[name=redeemscript_' + divid+']',form).parent('div').parent('div').show();
firstPrivKeyInput.attr('readonly','readonly');
}
}
}
$('span#total_inputs',form).html(totalInputs);
} else {
alert(j.error);
}
} catch(e) {
alert('Invalid Json Format.');
}
},
complete:function() {
self.val('Load');
}
});
"/>
</div>
</div>
<!--* This sample will extract UTX Outputs from provided UTX Hex-->
</div>
<div class="row">
<div class="col-sm-6">
<div class="form-row">
<div class="form-group col">
<label for="no_of_inputs">Inputs: <i>Max 10 inputs only. Please load them from UTX above.</i></label>
<div class="row">
<div class="col-sm-2">
<select class="form-control" id="no_of_inputs" name='no_of_inputs' style='width:auto;' onchange="
var self = $(this);
var thisvalue = self.val();
var form = self.closest('form');
$('div[id^=row_input_]',form).hide();
for(var i=1; i<= thisvalue; i++) {
$('div[id=row_input_'+ i + ']',form).show();
}
" readonly>
<?php
$optionval = $_POST['no_of_inputs']?$_POST['no_of_inputs'] : 0;
if ($optionval > 0) {
?>
<option value='<?php echo $optionval?>'><?php echo $optionval?></option>
<?php
}
?>
</select>
</div>
<div class="col-sm-10">
Total Sathoshi:
<span id='total_inputs'>
<?php echo
array_reduce(
array_keys($_POST),
function($carry, $key) {
if (preg_match('/^utxo_amount_/', $key)) {
return $carry + (int)$_POST[$key];
} else {
return $carry;
}
}, 0
);?>
</span>
</div>
</div>
</div>
</div>
<?php
$selected_n_inputs = is_numeric($_POST['no_of_inputs']) ? $_POST['no_of_inputs'] : 0;
foreach(range(1,$noOfInputs) as $thisInput) {
?>
<div class="form-row" id='row_input_<?php echo $thisInput?>' style="<?php echo ($thisInput > $selected_n_inputs) ? "display:none" : "display:;"?>">
<input type='hidden' name='utxo_amount_<?php echo $thisInput?>' value='<?php echo $_POST["utxo_amount_{$thisInput}"]?>'/>
<div class="form-group col-sm-1">
#<?php echo $thisInput?>
</div>
<div class="form-group col-sm-3">
<input class="form-control" title="UTXO Tx Hash" placeholder='UTXO Tx Hash' type='text' name='utxo_hash_<?php echo $thisInput?>' value='<?php echo $_POST["utxo_hash_{$thisInput}"]?>' readonly>
</div>
<div class="form-group col-sm-1">
<input class="form-control" title="UTXO N Output" placeholder='N' type='text' name='utxo_n_<?php echo $thisInput?>' value='<?php echo $_POST["utxo_n_{$thisInput}"]?>' readonly>
</div>
<div class="form-group col-sm-3">
<input class="form-control" title="UTXO ScriptPubKey" placeholder='UTXO ScriptPubKey' type='text' name='utxo_script_<?php echo $thisInput?>' value='<?php echo $_POST["utxo_script_{$thisInput}"]?>' readonly>
</div>
<div class="form-group col-sm-4">
<?php
$count = count($_POST["privkey_{$thisInput}"]);
$count = $count > 0 ? $count : 1;
foreach(range(0, $count-1) as $arrayIdx) {
?>
<input class="form-control" title="Private Key Hex, for signing purpose." placeholder='Private Key Hex' type='text' name='privkey_<?php echo $thisInput?>[]' value='<?php echo $_POST["privkey_{$thisInput}"][$arrayIdx]?>'>
<?php
}
?>
</div>
<div class="form-group col-sm-1" >
</div>
<div class="form-group col-sm-11">
<div class="input-group mb-3">
<input class="form-control" title="Enter Redeem Script to reveal number of required signature." placeholder='Enter Redeem Script to reveal number of required signature.' type='text' name='redeemscript_<?php echo $thisInput?>' value='<?php echo $_POST["redeemscript_{$thisInput}"]?>'/>
<div class="input-group-append">
<input class="btn btn-success" type="button" value="" onclick="
var self = $(this);
self.val('......');
var form = self.closest('form');
var formrow = self.closest('.form-row');
var scriptpubkey = $('input[name^=utxo_script_]', formrow).val();
var redeemscript = $('input[name^=redeemscript_]', formrow).val();
$.ajax({
url: '?ajax=1&action=load_redeemscript&scriptpubkey='+ scriptpubkey+ '&redeemscript=' + redeemscript,
success:function(result){
try {
j = eval('(' + result + ')');
if ('error' in j && j.error.length>0) {
var error = true;
} else {
var error = false;
}
if (!error) {
var reqSigs = parseInt(j.reqSigs);
var privKeySelector = $('input[name^=\'privkey_\']',formrow);
var firstPrivKeyInput = privKeySelector.filter(':first');
firstPrivKeyInput.removeAttr('readonly');
privKeySelector.not(':first').remove();
reqSigs--;
if (reqSigs > 0) {
for(var i=0; i<reqSigs;i++) {
firstPrivKeyInput.closest('div').append(firstPrivKeyInput.clone());
}
}
} else {
alert(j.error);
}
} catch(e) {
alert('Invalid Json Format.');
}
},
complete:function() {
self.val('Reveal');
}
});
"/>
</div>
</div>
</div>
</div>
<?php
}
?>
</div>
<div class="col-sm-6">
<div class="form-row">
<div class="form-group col">
<label for="no_of_outputs">Outputs:</label> <select class="form-control" id="no_of_outputs" name='no_of_outputs' style='width:auto;' onchange="
var self = $(this);
var thisvalue = self.val();
var form = self.closest('form');
$('div[id^=row_output_]',form).hide();
for(var i=1; i<= thisvalue; i++) {
$('div[id=row_output_'+ i + ']',form).show();
}
">
<?php
foreach(range(1,$noOfOutputs) as $thisOutput) {
echo "<option value='{$thisOutput}'".($thisOutput == $_POST['no_of_outputs'] ? " selected": "").">{$thisOutput}</option>";
}
?>
</select>
</div>
</div>
<?php
$selected_n_outputs = is_numeric($_POST['no_of_outputs']) ? $_POST['no_of_outputs'] : 1;
foreach(range(1,$noOfOutputs) as $thisOutput) {
?>
<div class="form-row" id='row_output_<?php echo $thisOutput?>' style="<?php echo ($thisOutput > $selected_n_outputs) ? "display:none" : "display:;"?>">
<div class="form-group col-sm-1">
#<?php echo $thisOutput?>
</div>
<div class="form-group col-sm-6">
<input class="form-control" placeholder='Any Address' type='text' name='address_<?php echo $thisOutput?>' value='<?php echo $_POST["address_{$thisOutput}"]?>'>
</div>
<div class="form-group col-sm-5">
<input class="form-control" placeholder='Amount' type='text' name='amount_<?php echo $thisOutput?>' value='<?php echo $_POST["amount_{$thisOutput}"]?>'>
</div>
</div>
<?php
}
?>
</div>
</div>
<input type='submit' class="btn btn-success btn-block"/>
</form>
<?php
include_once("html_iframe_footer.php");