Bitcoin P2WPKH

In 2015, Bitcoin developers came up with major improvements that known as Segregated Witness – SegWit and it has been mainly mentioned in BIP141 & BIP143. This improvement aims to solve

Scalability of bitcoin network.
Malleability transaction for lightning network solution.
Increase block size limit.

P2WPKH stands for "Pay To Witness Public Key Hash".
Address applies BECH32 encoding.
In Bitcoin, bc represents mainnet and tb represents testnet.

Script Pair of P2WPKH

ScriptPubKey	: OP_0 14<20 Bytes PublicKeyHash>
ScriptSig	: (Empty as ScriptSig has been moved to witness field.)
Witness Field	: <Signature> <PublicKey>

Witness Structure

The witness is a serialization of all witness data of the transaction. Each txin is associated with a witness field. A witness field starts with a var_int to indicate the number of stack items for the txin. It is followed by stack items, with each item starts with a var_int to indicate the length. Witness data is NOT script. See BIP 141.

Witness	Serialization of Witness Data.
Witness Data	All Witness Fields.
Witness Field	Witness field can refer to its txIn, start with var_int to indicate number of stack items.
Stack Item	Starts with a var_int to indicate the length.

<?php 
use BitWasp\Buffertools\Buffer;
use BitWasp\Bitcoin\Address\SegwitAddress;
use BitWasp\Bitcoin\Bitcoin;
use BitWasp\Bitcoin\Crypto\Random\Random;
use BitWasp\Bitcoin\Key\Factory\PrivateKeyFactory;
use BitWasp\Bitcoin\Network\NetworkFactory;
use BitWasp\Bitcoin\Script\WitnessProgram;

include_once "../libraries/vendor/autoload.php";
include_once("html_iframe_header.php");

if ($_GET['tab'] == 'form1_tabitem1' AND $_SERVER['REQUEST_METHOD'] == 'POST') {
	try {
		
		$networkClass   = $_POST['network'];
		Bitcoin::setNetwork(NetworkFactory::$networkClass());
		$network        = Bitcoin::getNetwork();
		$privKeyFactory = new PrivateKeyFactory();
	
		if (!$_POST['input'] OR ctype_xdigit($_POST['input'])) 
		{
			if (!$_POST['input']) 
			{ 
				$rbg = new Random();
				
				if ($_POST['compression'] == 'y') {
					$privateKey = $privKeyFactory->generateCompressed($rbg);
				} else {
					$privateKey = $privKeyFactory->generateUncompressed($rbg);
				}
			} else {
				if ($_POST['compression'] == 'y') {
					$privateKey = $privKeyFactory->fromHexCompressed($_POST['input']);
				} else {
					$privateKey = $privKeyFactory->fromHexUncompressed($_POST['input']);
				}
			}
		} else {
			$privateKey = $privKeyFactory->fromWIF($_POST['input'], $network);
		}
		
		$publicKey  = $privateKey->getPublicKey();
		$publicKeyHash = $publicKey->getPubKeyHash();
		$p2wpkhWP = WitnessProgram::v0($publicKeyHash);
		$p2wpkh = new SegwitAddress($p2wpkhWP);
	
	?>
		<div class="table-responsive">
			<table border=0 class='table'>
				<tr style='background-color:#f0f0f0'><td>Bech32 Address</td><td><?php echo $p2wpkh->getAddress()?></td></tr>
				<tr><td>Private Key Hex</td><td><?php echo $privateKey->getHex()?></td></tr>
				<tr><td>Private Key Wif</td><td><?php echo $privateKey->toWif()?></td></tr>
				<tr><td>Has Compression?</td><td><?php echo $privateKey->isCompressed() ? "Yes" : "No"?></td></tr>
				<tr style='background-color:#f0f0f0'><td>Public Key Hex</td><td><?php echo $publicKey->getHex()?></td></tr>
				<tr style='background-color:#f0f0f0'><td>Has Compression?</td><td><?php echo $publicKey->isCompressed()? "Yes" : "No"?></td></tr>
				
				<tr style='background-color:#f0f0f0'><td><span data-toggle="tooltip" title="HASH160 (Publiy Key Hex)" class='explaination'>Publiy Key Hash Hex</span></td><td><?php echo $publicKey->getPubKeyHash()->getHex()?></td></tr>
				
				<tr><td>Witness Version</td><td><?php echo $p2wpkhWP->getVersion()?></td></tr>
				<tr><td>Witness Program</td><td><?php echo $p2wpkhWP->getProgram()->getHex()?></td></tr>
				
				<tr style='background-color:#f0f0f0'><td>ScriptPubKey Hex </td><td><?php echo $p2wpkhWP->getScript()->getHex()?></td></tr>
				<tr style='background-color:#f0f0f0'><td>ScriptPubKey Asm</td>
					<td>
						<?php 
						$opcodes = $p2wpkhWP->getScript()->getOpcodes();
						
						foreach( $p2wpkhWP->getScript()->getScriptParser()->decode() as $operation ) {
							
							try {
								$op = $opcodes->getOp($operation->getOp());
							} catch (\RuntimeException $e) {
								$op = "";
							}
							
							echo $op ? $op . " " : "";
							
							if ($op != 'OP_0' AND $operation->isPush()) {
								$bytes = (int)ltrim($op, 'OP_PUSHDATA');
								$bytes = $bytes > 0 ? $bytes : 1;
								
								$hexsize = Buffer::int($operation->getDataSize(), $bytes)->getHex();
								echo htmlentities("{$hexsize}<{$operation->getData()->getHex()}> ");
							} 
						}
						?>
					</td>
				</tr>
			</table>
		</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=form1_tabitem1#hashtag1' 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="input">Private Key (Hex) / WIF:</label>
		
		<input class="form-control" type='text' name='input' id='input' value='<?php echo $_POST['input']?>'>
		* Put empty if you want system assign you a random private key.
	</div>
	<div class="form-group">
		<label for="compression" >Compression:</label>
		<select name="compression" class="form-control"  id='compression'>
			<?php
			$yesno = array("y"=>"Yes", "n"=>"No");
			foreach($yesno as $yesno_k=>$yesno_v) {
				echo "<option value='{$yesno_k}'".($yesno_k == $_POST['compression'] ? " selected": "").">{$yesno_v}</option>";
			}
			?>
		</select>
	</div>
	<input type='submit' class="btn btn-success btn-block"/>
</form>
<?php
include_once("html_iframe_footer.php");

Fund & Spend P2WPKH

Fund
Visual Coding
Spend
Visual Coding

<?php 
use BitWasp\Bitcoin\Bitcoin;
use BitWasp\Bitcoin\Key\Factory\PrivateKeyFactory;
use BitWasp\Bitcoin\Network\NetworkFactory;
use BitWasp\Buffertools\Buffer;
use BitWasp\Bitcoin\Address\AddressCreator;
use BitWasp\Bitcoin\Address\Bech32AddressInterface;
use BitWasp\Bitcoin\Transaction\TransactionFactory;
use BitWasp\Bitcoin\Transaction\TransactionOutput;
use BitWasp\Bitcoin\Transaction\Factory\Signer;
use BitWasp\Bitcoin\Script\ScriptFactory;
use BitWasp\Bitcoin\Script\Classifier\OutputClassifier;
use BitWasp\Bitcoin\Script\ScriptType;

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

$noOfInputs = 10;
$noOfOutputs = 10;

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 (!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}"]);
			$recipient = $addrCreator->fromString($address);
			
			if (!strlen($address) or !strlen($amount)) {
				throw new Exception("Error in 'output#{$thisOutput}'.");
			}
			
			if (!$recipient instanceof Bech32AddressInterface) {
				throw new Exception("Invalid P2WPKH address in 'output#{$thisOutput}' (Check bech32Address).");
			} 
			
			$decodeScript = (new OutputClassifier())->decode($recipient->getScriptPubKey());
			
			if ($decodeScript->getType() != ScriptType::P2WKH) {
				throw new Exception("Invalid P2WPKH address in 'output#{$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='' 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" 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++) { 
						$('div[id=row_input_'+  i + ']',form).show();
					}
					">
						<?php
						foreach(range(1,$noOfInputs) as $thisInput) {
							echo "<option value='{$thisInput}'".($thisInput == $_POST['no_of_inputs'] ? " selected": "").">{$thisInput}</option>";
						}
						?>
					</select>
				</div>
			</div>
			
			<?php
			$selectedNInputs = is_numeric($_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 > $selectedNInputs) ? "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 $_POST["privkey_{$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
			$selectedNOutputs = is_numeric($_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 > $selectedNOutputs) ? "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='P2WPKH 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");

<?php 
use BitWasp\Buffertools\Buffer;
use BitWasp\Bitcoin\Address\AddressCreator;
use BitWasp\Bitcoin\Bitcoin;
use BitWasp\Bitcoin\Key\Factory\PrivateKeyFactory;
use BitWasp\Bitcoin\Network\NetworkFactory;
use BitWasp\Bitcoin\Transaction\Factory\Signer;
use BitWasp\Bitcoin\Transaction\TransactionFactory;
use BitWasp\Bitcoin\Transaction\TransactionOutput;
use BitWasp\Bitcoin\Script\ScriptFactory;
use BitWasp\Bitcoin\Script\Classifier\OutputClassifier;
use BitWasp\Bitcoin\Script\ScriptType;
  
include_once "../libraries/vendor/autoload.php";

$noOfInputs = 10;
$noOfOutputs = 10;

if ($_SERVER['REQUEST_METHOD'] == 'GET' AND $_GET['ajax'] == '1') {
	
	$data = [];
	if (!ctype_xdigit($_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());
						
					if ($decodeScript->getType() != ScriptType::P2WKH) {
						$data = ["error"=>"Load fail! Your unspent transaction output (utxo) can only contain P2WPKH ScriptPubKey."];
						break;
					}
					$data['outputs'][] = ["amount"=>$output->getValue(), "n"=>$k, "scriptPubKey"=>$output->getScript()->getHex()];
				}
			}
		}
	}
	
	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);
			
			$privkeyhex = trim($_POST["privkey_" . ($k+1)]);
			
			$privkey = $privKeyFactory->fromHexCompressed($privkeyhex);
			$utxoScript = $utxo->getScript()->getHex();
			
			$utxoAmount = $utxo->getValue();
			
			$scriptPubKey = ScriptFactory::scriptPubKey()->p2wkh($privkey->getPubKeyHash()/*hash160*/);
			
			if ($utxoScript != $scriptPubKey->getHex()) {
				throw new Exception("Error in 'input#{$k}'. Private key derived Witness PubKeyHash is not matched to UTXO's ScriptPubKey.");
			}
			
			$signItems[] = [$privkeyhex, $utxoScript,$utxoAmount];
		}

		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}'.");
				
			} 
			
			$recipient = $addrCreator->fromString($address);
			$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]);
			$amount = $signItem[2];
			
			$txOutput = new TransactionOutput($amount, $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 class="table-responsive">
				<table class='table'>
					<tr><td><span data-toggle="tooltip" class='explaination' title='([nVersion][txins][txouts][nLockTime]).serialize().sha256d();'>TxId</span></td><td><?php echo $signer->get()->getTxId()->getHex()?></td></tr>
					
					<tr><td><span data-toggle="tooltip" class='explaination' title='([nVersion][marker][flag][txins][txouts][witness][nLockTime]).serialize().sha256d();'>WtxId</span></td><td><?php echo $signer->get()->getWitnessTxId()->getHex()?></td></tr>
					
				</table>
			</div>
			
			
			<h6 class="mt-3">Base Serialized Transaction (Without Witness)</h6>
			<textarea class="form-control" rows="5" id="comment" readonly><?php echo $thisTx->getBaseSerialization()->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" id="form2_tabitem3_load" 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&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);
										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);
										$('input[name=privkey_'+divid+']'      ,form).removeAttr('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: <small>Max 10 inputs only. Please load them from UTX above.</small></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
			$selectedNInputs = is_numeric($_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 > $selectedNInputs) ? "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">
						<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}"]?>'>
					</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
			$selectedNOutputs = is_numeric($_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 > $selectedNOutputs) ? "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");

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