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Currently im trying to build an explorer and im stuck on the block/listing transactions.
Currently this is my code.
foreach($info['tx'] AS $key => $value){ $txinfo = callBTC("getrawtransaction",array("\"$value\"",true)); echo '<pre>'; print_r($txinfo); echo '</pre>'; echo '<div class="tx"><div class="txRow"><div class="txCat">Hash</div><div class="txInfo"><div class="overflow"><a href="index?txid='.$value.'">'.$value.'</a></div></div></div>'; echo '<div class="txRow"><div class="txCat">Time</div><div class="txInfo">'.date("Y-m-d H:i:s",$txinfo['time']).'</div></div>'; echo '<div class="txRow"><div class="txCat">From</div><div class="txInfo"><div class="overflow">'; foreach($txinfo['vin'] AS $key2 => $value2){ if(!empty($txinfo['vin'][$key2]['coinbase'])){ echo '<div class="confirmed">COINBASE - Newly Created Coins</div>'; }else{ $from = callBTC("getrawtransaction",array("\"$value2[txid]\"",true)); echo '<pre>'; print_r($from); echo '</pre>'; echo $from['vout'][0]['scriptPubKey']['addresses'][0].'<br/>'; } } echo '</div></div></div>'; echo '<div class="txRow"><div class="txCat">To</div><div class="txInfo"><div class="overflow">'; foreach($txinfo['vout'] AS $key3 => $value3){ if(!empty($value3['scriptPubKey']['addresses'])){ foreach($value3['scriptPubKey']['addresses'] AS $key4 => $value4){ echo '<a href="index?addid='.$value4.'">'.$value4.'</a><br/>'; } } } echo '</div></div></div>'; echo '<div class="txRow"><div class="txCat">Fee</div><div class="txInfo"></div></div>'; echo '<div class="txRow"><div class="txCat">Amount</div><div class="txInfo"></div></div></div>'; }i got the to addresses fine but whne it comes to the from field i struggle to determine which is the valid address to use.
Lets use block 2092235 for example
I use blockchain.com to check against my site to ensure im displaying the proper data.
but when i spit out the transaction for the tx id ac709fc580430d51ab741e339edd184c349306c9881f95085851eef0652b1fb6 i get this...
Array ( [txid] => ac709fc580430d51ab741e339edd184c349306c9881f95085851eef0652b1fb6 [hash] => b388c750f3d15f1fcdb320fbc3398a65a34a3eb6933ca1738729f22a4a8a5924 [version] => 2 [size] => 222 [vsize] => 141 [weight] => 561 [locktime] => 2092234 [vin] => Array ( [0] => Array ( [txid] => 122e916b2236fb1d6c5d21e886ffe72b3834ca3d81bed51686aa91d5c069ed5c [vout] => 1 [scriptSig] => Array ( [asm] => [hex] => ) [txinwitness] => Array ( [0] => 304402201c4ff3fa6d7d212760db2c03e39bc824756c10bbac77a10db7665c383e16600b0220146f62d2c0a28d335ecad0f38227259ead389d409259f3af693628443695bbf401 [1] => 0258471daabd690819d6cbb34b8ca75f98ba24604960301ce7c90cc5131ab07280 ) [sequence] => 4294967294 ) ) [vout] => Array ( [0] => Array ( [value] => 0.01905871 [n] => 0 [scriptPubKey] => Array ( [asm] => 0 2cda63f440de6ab858cf2550daf3b25522d6c66f [hex] => 00142cda63f440de6ab858cf2550daf3b25522d6c66f [reqSigs] => 1 [type] => witness_v0_keyhash [addresses] => Array ( [0] => tb1q9ndx8azqme4tskx0y4gd4uaj253dd3n0386xkn ) ) ) [1] => Array ( [value] => 72.44723495 [n] => 1 [scriptPubKey] => Array ( [asm] => 0 e179ad3cb0d3bc53cba564cc2e05bc2dc18de1ab [hex] => 0014e179ad3cb0d3bc53cba564cc2e05bc2dc18de1ab [reqSigs] => 1 [type] => witness_v0_keyhash [addresses] => Array ( [0] => tb1qu9u6609s6w798ja9vnxzupdu9hqcmcdtvm87gx ) ) ) ) [hex] => 020000000001015ced69c0d591aa8616d5be813dca34382be7ff86e8215d6c1dfb36226b912e120100000000feffffff02cf141d00000000001600142cda63f440de6ab858cf2550daf3b25522d6c66f27b5d1af01000000160014e179ad3cb0d3bc53cba564cc2e05bc2dc18de1ab0247304402201c4ff3fa6d7d212760db2c03e39bc824756c10bbac77a10db7665c383e16600b0220146f62d2c0a28d335ecad0f38227259ead389d409259f3af693628443695bbf401210258471daabd690819d6cbb34b8ca75f98ba24604960301ce7c90cc5131ab07280caec1f00 [blockhash] => 000000000000003f69d7c8cb4943df2d7a273883eb72024f3305122ed2dc7271 [confirmations] => 1418 [time] => 1631039838 [blocktime] => 1631039838 )
then i get the tx id from the vin field to get info on the transaction for that address(the from field) and i get this.
Array ( [txid] => 122e916b2236fb1d6c5d21e886ffe72b3834ca3d81bed51686aa91d5c069ed5c [hash] => 5fb52307d771c7dadf9f06006340a0acb5ff9ebe15d215d98f08e749d0ee2e59 [version] => 2 [size] => 222 [vsize] => 141 [weight] => 561 [locktime] => 2092232 [vin] => Array ( [0] => Array ( [txid] => 2739adc2b59de66a9e707ec3e102549dc56a8432e38ef471cb961976a27739be [vout] => 0 [scriptSig] => Array ( [asm] => [hex] => ) [txinwitness] => Array ( [0] => 3044022077216db352b3024fbb92ff798b618dc3a45fe727077872d2ee5e699ea8fc839d02207dde0f94b0d2cd8900dda6c189134c5d7614278a582e2e1f131c0e16be86534e01 [1] => 036e8d75e18796979cdfebcc82d44930d5265ad3820156932194bd7cda5192296a ) [sequence] => 4294967294 ) ) [vout] => Array ( [0] => Array ( [value] => 0.01275647 [n] => 0 [scriptPubKey] => Array ( [asm] => 0 184337352372a5fa6218dd57ea1057305d39c77d [hex] => 0014184337352372a5fa6218dd57ea1057305d39c77d [reqSigs] => 1 [type] => witness_v0_keyhash [addresses] => Array ( [0] => tb1qrppnwdfrw2jl5cscm4t75yzhxpwnn3mamh6ff8 ) ) ) [1] => Array ( [value] => 72.46645714 [n] => 1 [scriptPubKey] => Array ( [asm] => 0 c4520316f8d1dee0a19acde950d0540701d3d013 [hex] => 0014c4520316f8d1dee0a19acde950d0540701d3d013 [reqSigs] => 1 [type] => witness_v0_keyhash [addresses] => Array ( [0] => tb1qc3fqx9hc680wpgv6eh54p5z5quqa85qn35meep ) ) ) ) [hex] => 02000000000101be3977a2761996cb71f48ee332846ac59d5402e1c37e709e6ae69db5c2ad39270000000000feffffff02ff76130000000000160014184337352372a5fa6218dd57ea1057305d39c77dd209efaf01000000160014c4520316f8d1dee0a19acde950d0540701d3d01302473044022077216db352b3024fbb92ff798b618dc3a45fe727077872d2ee5e699ea8fc839d02207dde0f94b0d2cd8900dda6c189134c5d7614278a582e2e1f131c0e16be86534e0121036e8d75e18796979cdfebcc82d44930d5265ad3820156932194bd7cda5192296ac8ec1f00 [blockhash] => 00000000000000d299298de1cfb14276667b7d55e8a1cf43c9dc825babadf058 [confirmations] => 1420 [time] => 1631039256 [blocktime] => 1631039256 )
by looking at blockchain i know which address it SHOULD take (tb1qc3fqx9hc680wpgv6eh54p5z5quqa85qn35meep)...but when i use php and check for last key in array its not always the correct address in other transactions as sometimes the address i need is in a different index(same array tho just different index).
How can i programmatically determine the right address consistently?
i got the to addresses fine but when it comes to the from field i struggle to determine which is the valid address to use.
There is no 'from' address in any transaction as mentioned by Sipa in the comments.
Is it possible to assign a single "from" and a single "to" address to Bitcoin transactions?
but when i spit out the transaction for the tx id ac709fc580430d51ab741e339edd184c349306c9881f95085851eef0652b1fb6
How can i programmatically determine the right address consistently?
I will share steps to check inputs and outputs for this transaction using Bitcoin Core:
$ bitcoin-cli getrawtransaction 0d45dacc0e50066a55c13b54cdcd6e365bb90be3a492c55bf4200b01d02fd748
020000000001015ced69c0d591aa8616d5be813dca34382be7ff86e8215d6c1dfb36226b912e120100000000feffffff02cf141d00000000001600142cda63f440de6ab858cf2550daf3b25522d6c66f27b5d1af01000000160014e179ad3cb0d3bc53cba564cc2e05bc2dc18de1ab0247304402201c4ff3fa6d7d212760db2c03e39bc824756c10bbac77a10db7665c383e16600b0220146f62d2c0a28d335ecad0f38227259ead389d409259f3af693628443695bbf401210258471daabd690819d6cbb34b8ca75f98ba24604960301ce7c90cc5131ab07280caec1f00
$ bitcoin-cli decoderawtransaction 020000000001015ced69c0d591aa8616d5be813dca34382be7ff86e8215d6c1dfb36226b912e120100000000feffffff02cf141d00000000001600142cda63f440de6ab858cf2550daf3b25522d6c66f27b5d1af01000000160014e179ad3cb0d3bc53cba564cc2e05bc2dc18de1ab0247304402201c4ff3fa6d7d212760db2c03e39bc824756c10bbac77a10db7665c383e16600b0220146f62d2c0a28d335ecad0f38227259ead389d409259f3af693628443695bbf401210258471daabd690819d6cbb34b8ca75f98ba24604960301ce7c90cc5131ab07280caec1f00
{ "txid": "ac709fc580430d51ab741e339edd184c349306c9881f95085851eef0652b1fb6", "hash": "b388c750f3d15f1fcdb320fbc3398a65a34a3eb6933ca1738729f22a4a8a5924", "version": 2, "size": 222, "vsize": 141, "weight": 561, "locktime": 2092234, "vin": [ { "txid": "122e916b2236fb1d6c5d21e886ffe72b3834ca3d81bed51686aa91d5c069ed5c", "vout": 1, "scriptSig": { "asm": "", "hex": "" }, "txinwitness": [ "304402201c4ff3fa6d7d212760db2c03e39bc824756c10bbac77a10db7665c383e16600b0220146f62d2c0a28d335ecad0f38227259ead389d409259f3af693628443695bbf401", "0258471daabd690819d6cbb34b8ca75f98ba24604960301ce7c90cc5131ab07280" ], "sequence": 4294967294 } ], "vout": [ { "value": 0.01905871, "n": 0, "scriptPubKey": { "asm": "0 2cda63f440de6ab858cf2550daf3b25522d6c66f", "hex": "00142cda63f440de6ab858cf2550daf3b25522d6c66f", "address": "tb1q9ndx8azqme4tskx0y4gd4uaj253dd3n0386xkn", "type": "witness_v0_keyhash" } }, { "value": 72.44723495, "n": 1, "scriptPubKey": { "asm": "0 e179ad3cb0d3bc53cba564cc2e05bc2dc18de1ab", "hex": "0014e179ad3cb0d3bc53cba564cc2e05bc2dc18de1ab", "address": "tb1qu9u6609s6w798ja9vnxzupdu9hqcmcdtvm87gx", "type": "witness_v0_keyhash" } } ]
}| Inputs | Outputs |
|---|---|
| "txid": "122e916b2236fb1d6c5d21e886ffe72b3834ca3d81bed51686aa91d5c069ed5c", "vout": 1 | tb1q9ndx8azqme4tskx0y4gd4uaj253dd3n0386xkn (0.01905871) |
| tb1qu9u6609s6w798ja9vnxzupdu9hqcmcdtvm87gx (72.44723495) |
To get more information about input being spent in this transaction:
$ bitcoin-cli getrawtransaction 122e916b2236fb1d6c5d21e886ffe72b3834ca3d81bed51686aa91d5c069ed5c
02000000000101be3977a2761996cb71f48ee332846ac59d5402e1c37e709e6ae69db5c2ad39270000000000feffffff02ff76130000000000160014184337352372a5fa6218dd57ea1057305d39c77dd209efaf01000000160014c4520316f8d1dee0a19acde950d0540701d3d01302473044022077216db352b3024fbb92ff798b618dc3a45fe727077872d2ee5e699ea8fc839d02207dde0f94b0d2cd8900dda6c189134c5d7614278a582e2e1f131c0e16be86534e0121036e8d75e18796979cdfebcc82d44930d5265ad3820156932194bd7cda5192296ac8ec1f00
$ bitcoin-cli decoderawtransaction 02000000000101be3977a2761996cb71f48ee332846ac59d5402e1c37e709e6ae69db5c2ad39270000000000feffffff02ff76130000000000160014184337352372a5fa6218dd57ea1057305d39c77dd209efaf01000000160014c4520316f8d1dee0a19acde950d0540701d3d01302473044022077216db352b3024fbb92ff798b618dc3a45fe727077872d2ee5e699ea8fc839d02207dde0f94b0d2cd8900dda6c189134c5d7614278a582e2e1f131c0e16be86534e0121036e8d75e18796979cdfebcc82d44930d5265ad3820156932194bd7cda5192296ac8ec1f00
Check vout:1 in the results below:
{ "txid": "122e916b2236fb1d6c5d21e886ffe72b3834ca3d81bed51686aa91d5c069ed5c", "hash": "5fb52307d771c7dadf9f06006340a0acb5ff9ebe15d215d98f08e749d0ee2e59", "version": 2, "size": 222, "vsize": 141, "weight": 561, "locktime": 2092232, "vin": [ { "txid": "2739adc2b59de66a9e707ec3e102549dc56a8432e38ef471cb961976a27739be", "vout": 0, "scriptSig": { "asm": "", "hex": "" }, "txinwitness": [ "3044022077216db352b3024fbb92ff798b618dc3a45fe727077872d2ee5e699ea8fc839d02207dde0f94b0d2cd8900dda6c189134c5d7614278a582e2e1f131c0e16be86534e01", "036e8d75e18796979cdfebcc82d44930d5265ad3820156932194bd7cda5192296a" ], "sequence": 4294967294 } ], "vout": [ { "value": 0.01275647, "n": 0, "scriptPubKey": { "asm": "0 184337352372a5fa6218dd57ea1057305d39c77d", "hex": "0014184337352372a5fa6218dd57ea1057305d39c77d", "address": "tb1qrppnwdfrw2jl5cscm4t75yzhxpwnn3mamh6ff8", "type": "witness_v0_keyhash" } }, { "value": 72.46645714, "n": 1, "scriptPubKey": { "asm": "0 c4520316f8d1dee0a19acde950d0540701d3d013", "hex": "0014c4520316f8d1dee0a19acde950d0540701d3d013", "address": "tb1qc3fqx9hc680wpgv6eh54p5z5quqa85qn35meep", "type": "witness_v0_keyhash" } } ]
}We have all the information about inputs and outputs for this transaction similar to most of the block explorers:
| Inputs | Outputs |
|---|---|
| tb1qc3fqx9hc680wpgv6eh54p5z5quqa85qn35meep (72.46645714) | tb1q9ndx8azqme4tskx0y4gd4uaj253dd3n0386xkn (0.01905871) |
| tb1qu9u6609s6w798ja9vnxzupdu9hqcmcdtvm87gx (72.44723495) |
You can do everything using Bitcoin Core, JSON-RPC and PHP. Example:
<?php
$curl = curl_init();
curl_setopt_array($curl, array( CURLOPT_URL => 'http://localhost:18222/', CURLOPT_RETURNTRANSFER => true, CURLOPT_ENCODING => '', CURLOPT_MAXREDIRS => 10, CURLOPT_TIMEOUT => 0, CURLOPT_FOLLOWLOCATION => true, CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1, CURLOPT_CUSTOMREQUEST => 'POST', CURLOPT_POSTFIELDS =>'{"jsonrpc": "1.0", "id": "curltest", "method": "getrawtransaction", "params": ["ac709fc580430d51ab741e339edd184c349306c9881f95085851eef0652b1fb6"]}', CURLOPT_HTTPHEADER => array( 'Authorization: Basic dXNlcjM6cGFzc3dvcmQz', 'Content-Type: text/plain' ),
));
$response = curl_exec($curl);
curl_close($curl);
echo $response; 
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