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Bitwasp MULTISIG

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.
P2SH.Multisig (Multisig wrapped in P2SH)
  • Most common way to use multisig.
  • Described in BIP67.
  • Exist after P2MS.
  • Use of P2SH address implies that spender no longer bear for high tx fees as compare to P2MS below.
P2MS
  • Stands for "Pay To Multi Signature"
  • M-of-N Standard Transactions described in BIP11.
  • Not common as P2MS has no address format and limited to 3 public keys.
  • In this tutorial, you are able to fund into P2MS's ScriptPubKey for better understanding to bitcoin script.
Script Pair of P2SH.Multisig
ScriptPubKey: OP_HASH160 <redeemScriptHash> OP_EQUAL
ScriptSig: OP_0 < ... > OP_PUSHDATA1 <redeemScript>
Redeem Script : < ... > OP_CHECKMULTISIG
Script Pair of P2MS
ScriptSig:
ScriptPubKey :

Multisig Address

<?php 
use BitWasp\Bitcoin\Bitcoin;
use BitWasp\Bitcoin\Network\NetworkFactory;
use BitWasp\Buffertools\Buffer;
use BitWasp\Bitcoin\Key\Factory\PublicKeyFactory;
use BitWasp\Bitcoin\Script\ScriptFactory;
use BitWasp\Bitcoin\Script\P2shScript;
use BitWasp\Bitcoin\Script\Opcodes;

include_once "../libraries/vendor/autoload.php";

$M_N_Range = range(1,15);

include_once("html_iframe_header.php");

if ($_SERVER['REQUEST_METHOD'] == 'POST') {

	try {
		
		$networkClass   = $_POST['network'];
		Bitcoin::setNetwork(NetworkFactory::$networkClass());
		$network        = Bitcoin::getNetwork();
		$pubKeys = [];
		
		$publicKeyFactory = new PublicKeyFactory();
		if (!in_array($_POST['reqsig'], $M_N_Range)) {
			throw new Exception("'Required Signature' value is not valid.");
		} else {
			foreach($_POST['pubkey'] as $pubkey_hex) {
				if (strlen($pubkey_hex) > 0 AND !ctype_xdigit($pubkey_hex)) {
					throw new Exception("Public key must be hex.");
				}
				
				if (strlen($pubkey_hex) > 0 AND ctype_xdigit($pubkey_hex)) {
					$validPubKeys[] = $publicKeyFactory->fromHex($pubkey_hex);;
				}
			}
		}
		
		if ($_POST['reqsig'] > count($validPubKeys)) {
			throw new Exception("Required signature value should not exceed number of public key.");
		}  
		
		// make a n-of-m multisignature script
		$multisig = ScriptFactory::scriptPubKey()->multisig($_POST['reqsig'], $validPubKeys, $sort = false);
		
		// use the P2shScript 'decorator' to 'extend' script with extra functions relevant to a P2SH script
		$redeemScript = new P2shScript($multisig);
		
		$scriptPubKey = $redeemScript->getOutputScript();
		
		$opcodes = $scriptPubKey->getOpcodes();
	
	?>
		<div class="table-responsive">
			<h6 class="mt-3">P2SH.Multisig</h6>
			<table border=0 class='table'>
				<tr style='background-color:#f0f0f0'><td>Base58 address</td><td><?php echo $redeemScript->getAddress()->getAddress();?></td></tr>
				<tr><td>Redeem Script Hex </td><td><?php echo $redeemScript->getHex();?></td></tr>
				<tr><td>Redeem Script Asm</td>
					<td>
						<?php 
						foreach( $redeemScript->getScriptParser()->decode() as $operation ) {
							if ($operation->isPush()) {
								echo htmlentities("<{$operation->getData()->getHex()}> ");
							} else {
								echo $opcodes->getOp($operation->getOp()) . " " ;
							}
						}
						?>
					</td>
				</tr>
				
				<tr><td>Redeem Script Hash Hex</td><td><?php echo $redeemScript->getScriptHash()->getHex();?></td></tr>
				
				<tr style='background-color:#f0f0f0'><td>ScriptPubKey Hex </td><td><?php echo $scriptPubKey->getHex()?></td></tr>
				<tr style='background-color:#f0f0f0'><td>ScriptPubKey Asm</td>
					<td>
						<?php 
						foreach( $scriptPubKey->getScriptParser()->decode() as $operation ) {
							if ($operation->isPush()) {								
								echo htmlentities("<{$operation->getData()->getHex()}> ");
							} else {
								echo $opcodes->getOp($operation->getOp()) . " " ;
							}
						}
						?>
					</td>
				</tr>
			</table>
			
			<?php
			if (@count($validPubKeys) <= 3) {
			?>
				<h6 class="mt-3">P2MS</h6>
				<table border=0 class='table'>
					<tr><td>ScriptPubKey Hex </td><td><?php echo $redeemScript->getHex();?></td></tr>
					
					<tr><td>ScriptPubKey Asm</td>
						<td>
							<?php 
							foreach( $redeemScript->getScriptParser()->decode() as $operation ) {
								if ($operation->isPush()) {
									
									echo htmlentities("<{$operation->getData()->getHex()}> ");
								} else {
									echo $opcodes->getOp($operation->getOp()) . " " ;
								}
							}
							?>
						</td>
					</tr>
				</table>
			<?php
			}
			?>
		</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 id="network" name="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="pubkey">Public Key Hex:</label>
		
		<div class="input-group mb-3">
			<input class="form-control" type='text' name='pubkey[]' id='pubkey' value='<?php echo $_POST['pubkey'][0]?>'>
			<div class="input-group-append">
				<input class="btn btn-success" type="button" value="+" onclick="$('#multisig-pubkey-holder').find('div').first().clone().appendTo('#multisig-pubkey-holder')"/>
			</div>
		</div>
	</div>
	<?php
	$displayPublickey = count($_POST['pubkey'])-1;
	$displayPublickey = max(1, $displayPublickey);
	?>
	<div id="multisig-pubkey-holder" class="form-group">
		
		<?php
		foreach(range(1, $displayPublickey) as $n) {
		?>
		<div class="input-group mb-3">
			<input class="form-control" type='text' name='pubkey[]' value='<?php echo $_POST['pubkey'][$n]?>'>
			<div class="input-group-append">
				<input class="btn btn-success" type="button" value=" - " onclick="
					var length = $(this).closest('#multisig-pubkey-holder').find('input[value=\' - \']').length;
					if (length > 1) {
						$(this).parent('div').parent('div').remove();
					} else {
						alert('At least 2 public keys are required');
					}
				"/>
			</div>
		</div>
		<?Php
		}
		?>
		
	</div>
	
	<div class="form-group">
		<label for="reqsig">Required Signature To Spend:</label>
		<select id="reqsig" name="reqsig" class="form-control" >
			<?php
			foreach($M_N_Range as $k) {
				echo "<option value='{$k}'".($k == $_POST['reqsig'] ? " selected": "").">{$k}</option>";
			}
			?>
		</select>
	</div>
	
	
	<input type='submit' class="btn btn-success btn-block"/>
</form>
<?php
include_once("html_iframe_footer.php");

Fund & Spend Multisig

<?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\Transaction\Factory\TxBuilder;
use BitWasp\Bitcoin\Transaction\TransactionFactory;
use BitWasp\Bitcoin\Transaction\TransactionOutput;
use BitWasp\Bitcoin\Transaction\Factory\Signer;
use BitWasp\Bitcoin\Script\ScriptType;
use BitWasp\Bitcoin\Script\ScriptFactory;
use BitWasp\Bitcoin\Script\Classifier\OutputClassifier;

include_once "../libraries/vendor/autoload.php";

$noOfInputs = 10;
$noOfOutputs = 1;

include_once("html_iframe_header.php");

if ($_GET['tab'] == 'form2_tabitem1' AND $_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 (!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'.");
		}
			
		foreach(range(1,$_POST['no_of_inputs']) as $thisInput) {
			$utxoHash = trim($_POST["utxo_hash_{$thisInput}"]);
			$utxoNOutput = trim($_POST["utxo_n_{$thisInput}"]);
			$privkeyhex = trim($_POST["privkey_{$thisInput}"]);
			$utxoScript = trim($_POST["utxo_script_{$thisInput}"]);
			
			if (strlen($utxoHash)>0 AND strlen($utxoNOutput) > 0 AND strlen($privkeyhex) > 0) {
				$spendTx = $spendTx->input($utxoHash, $utxoNOutput);
				$signItems[] = [$privkeyhex, $utxoScript];
			} else {
				throw new Exception("Error in 'input#{$thisInput}'.");
			}
		}
		
		foreach(range(1,$_POST['no_of_outputs']) as $thisOutput) {
			
			$address = trim($_POST["address_{$thisOutput}"]);
			$amount = trim($_POST["amount_{$thisOutput}"]);
			
			if (!strlen($address) or !strlen($amount)) {
				throw new Exception("Error in 'output#{$thisOutput}'.");
			}
			
			if (ctype_xdigit($address)) {//hex
				
				$recipient = ScriptFactory::fromHex($address);
				
				$decodeScript = (new OutputClassifier())->decode($recipient);
				
				if ($decodeScript->getType() != ScriptType::MULTISIG) {
					throw new Exception("Invalid P2MS output in 'output#{$thisOutput}' (Check scriptPubKey).");
				}
				
				$spendTx = $spendTx->output($amount, $recipient);
				
				
			} else {
				
				
				$recipient = $addrCreator->fromString($address);
				
				$decodeScript = (new OutputClassifier())->decode($recipient->getScriptPubKey());
				
				if ($decodeScript->getType() != ScriptType::P2SH) {
					throw new Exception("Invalid P2SH addresss in 'output#{$thisOutput}' (Check scriptPubKey).");
				}
				
				$spendTx = $spendTx->payToAddress($amount, $recipient);
			}
		}
		
		$thisTx = $spendTx->get();
		
		$signer = new Signer($thisTx, $ecAdapter);
		
		foreach($signItems as $nIn=>$signItem) {
			$privateKey = $privKeyFactory->fromHexCompressed($signItem[0]);
			
			$scriptPubKey = ScriptFactory::fromHex($signItem[1]);
			
			$txOutput = new TransactionOutput(0, $scriptPubKey );
			
			$signer = $signer->sign($nIn, $privateKey, $txOutput);
		}
		
		
		
	?>
		<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='?tab=form2_tabitem1#hashtag2' 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="row">
		<div class="col-sm-6">
			
			<div class="form-row">
				<div class="form-group col">
					<label for="no_of_inputs">Inputs: </label> 
					<select class="form-control" style="width:auto;" id="no_of_inputs" name='no_of_inputs' 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++) { 
						$('div[id=row_input_'+  i + ']',form).show();
					}
					">
						<?php
						foreach(range(1,$noOfInputs) as $thisInput) {
							echo "<option value='{$thisInput}'".($thisInput == $_POST['no_of_inputs'] ? " selected": "").">{$thisInput}</option>";
						}
						?>
					</select>
				</div>
			</div>
			
			<?php
			$selected_n_inputs = is_numeric($_POST['no_of_inputs']) ? $_POST['no_of_inputs'] : 1;
			
			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:;"?>">
				
					<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}"]?>'>
					</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}"]?>'>
					</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}"]?>'>
					</div>
					<div class="form-group  col-sm-4">
						<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 $_GET['tab'] == 'form2_tabitem1' ?$_POST["privkey_{$thisInput}"] : ''?>'>
					</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" title='P2SH.Multisig Address / P2MS ScriptPubKey' placeholder='P2SH.Multisig Address / P2MS ScriptPubKey' 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");		
<?php 
use BitWasp\Bitcoin\Bitcoin;
use BitWasp\Bitcoin\Network\NetworkFactory;
use BitWasp\Buffertools\Buffer;
use BitWasp\Bitcoin\Key\Factory\PublicKeyFactory;
use BitWasp\Bitcoin\Script\ScriptFactory;
use BitWasp\Bitcoin\Script\P2shScript;
use BitWasp\Bitcoin\Script\Opcodes;

include_once "../libraries/vendor/autoload.php";

$M_N_Range = range(1,15);

include_once("html_iframe_header.php");

if ($_SERVER['REQUEST_METHOD'] == 'POST') {

	try {
		
		$networkClass   = $_POST['network'];
		Bitcoin::setNetwork(NetworkFactory::$networkClass());
		$network        = Bitcoin::getNetwork();
		$pubKeys = [];
		
		$publicKeyFactory = new PublicKeyFactory();
		if (!in_array($_POST['reqsig'], $M_N_Range)) {
			throw new Exception("'Required Signature' value is not valid.");
		} else {
			foreach($_POST['pubkey'] as $pubkey_hex) {
				if (strlen($pubkey_hex) > 0 AND !ctype_xdigit($pubkey_hex)) {
					throw new Exception("Public key must be hex.");
				}
				
				if (strlen($pubkey_hex) > 0 AND ctype_xdigit($pubkey_hex)) {
					$validPubKeys[] = $publicKeyFactory->fromHex($pubkey_hex);;
				}
			}
		}
		
		if ($_POST['reqsig'] > count($validPubKeys)) {
			throw new Exception("Required signature value should not exceed number of public key.");
		}  
		
		// make a n-of-m multisignature script
		$multisig = ScriptFactory::scriptPubKey()->multisig($_POST['reqsig'], $validPubKeys, $sort = false);
		
		// use the P2shScript 'decorator' to 'extend' script with extra functions relevant to a P2SH script
		$redeemScript = new P2shScript($multisig);
		
		$scriptPubKey = $redeemScript->getOutputScript();
		
		$opcodes = $scriptPubKey->getOpcodes();
	
	?>
		<div class="table-responsive">
			<h6 class="mt-3">P2SH.Multisig</h6>
			<table border=0 class='table'>
				<tr style='background-color:#f0f0f0'><td>Base58 address</td><td><?php echo $redeemScript->getAddress()->getAddress();?></td></tr>
				<tr><td>Redeem Script Hex </td><td><?php echo $redeemScript->getHex();?></td></tr>
				<tr><td>Redeem Script Asm</td>
					<td>
						<?php 
						foreach( $redeemScript->getScriptParser()->decode() as $operation ) {
							if ($operation->isPush()) {
								echo htmlentities("<{$operation->getData()->getHex()}> ");
							} else {
								echo $opcodes->getOp($operation->getOp()) . " " ;
							}
						}
						?>
					</td>
				</tr>
				
				<tr><td>Redeem Script Hash Hex</td><td><?php echo $redeemScript->getScriptHash()->getHex();?></td></tr>
				
				<tr style='background-color:#f0f0f0'><td>ScriptPubKey Hex </td><td><?php echo $scriptPubKey->getHex()?></td></tr>
				<tr style='background-color:#f0f0f0'><td>ScriptPubKey Asm</td>
					<td>
						<?php 
						foreach( $scriptPubKey->getScriptParser()->decode() as $operation ) {
							if ($operation->isPush()) {								
								echo htmlentities("<{$operation->getData()->getHex()}> ");
							} else {
								echo $opcodes->getOp($operation->getOp()) . " " ;
							}
						}
						?>
					</td>
				</tr>
			</table>
			
			<?php
			if (@count($validPubKeys) <= 3) {
			?>
				<h6 class="mt-3">P2MS</h6>
				<table border=0 class='table'>
					<tr><td>ScriptPubKey Hex </td><td><?php echo $redeemScript->getHex();?></td></tr>
					
					<tr><td>ScriptPubKey Asm</td>
						<td>
							<?php 
							foreach( $redeemScript->getScriptParser()->decode() as $operation ) {
								if ($operation->isPush()) {
									
									echo htmlentities("<{$operation->getData()->getHex()}> ");
								} else {
									echo $opcodes->getOp($operation->getOp()) . " " ;
								}
							}
							?>
						</td>
					</tr>
				</table>
			<?php
			}
			?>
		</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 id="network" name="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="pubkey">Public Key Hex:</label>
		
		<div class="input-group mb-3">
			<input class="form-control" type='text' name='pubkey[]' id='pubkey' value='<?php echo $_POST['pubkey'][0]?>'>
			<div class="input-group-append">
				<input class="btn btn-success" type="button" value="+" onclick="$('#multisig-pubkey-holder').find('div').first().clone().appendTo('#multisig-pubkey-holder')"/>
			</div>
		</div>
	</div>
	<?php
	$displayPublickey = count($_POST['pubkey'])-1;
	$displayPublickey = max(1, $displayPublickey);
	?>
	<div id="multisig-pubkey-holder" class="form-group">
		
		<?php
		foreach(range(1, $displayPublickey) as $n) {
		?>
		<div class="input-group mb-3">
			<input class="form-control" type='text' name='pubkey[]' value='<?php echo $_POST['pubkey'][$n]?>'>
			<div class="input-group-append">
				<input class="btn btn-success" type="button" value=" - " onclick="
					var length = $(this).closest('#multisig-pubkey-holder').find('input[value=\' - \']').length;
					if (length > 1) {
						$(this).parent('div').parent('div').remove();
					} else {
						alert('At least 2 public keys are required');
					}
				"/>
			</div>
		</div>
		<?Php
		}
		?>
		
	</div>
	
	<div class="form-group">
		<label for="reqsig">Required Signature To Spend:</label>
		<select id="reqsig" name="reqsig" class="form-control" >
			<?php
			foreach($M_N_Range as $k) {
				echo "<option value='{$k}'".($k == $_POST['reqsig'] ? " selected": "").">{$k}</option>";
			}
			?>
		</select>
	</div>
	
	
	<input type='submit' class="btn btn-success btn-block"/>
</form>
<?php
include_once("html_iframe_footer.php");







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