PHP - Validate Multisig Bitcoin Wallet Address with Leading 2 or 3

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I have used this function for validating the bitcoin wallet address to see if it's a bitcoin address. However, it's not working with the address that starts with "3" (multi-sig). For example, 3EktnHQD7RiAE6uzMj2ZifT9YgRrkSgzQX.

Can anyone help me with that function to make it work so that it can validate all major forms of bitcoin wallet addresses?

Apr 7, 2022 in Blockchain by Rahul
• 9,670 points
1,717 views

1 answer to this question.

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 The answer to your question is located here

function validate($address){ $decoded = decodeBase58($address); $d1 = hash("sha256", substr($decoded,0,21), true); $d2 = hash("sha256", $d1, true); if(substr_compare($decoded, $d2, 21, 4)){ throw new \Exception("bad digest"); } return true; } function decodeBase58($input) { $alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"; $out = array_fill(0, 25, 0); for($i=0;$i<strlen($input);$i++){ if(($p=strpos($alphabet, $input[$i]))===false){ throw new \Exception("invalid character found"); } $c = $p; for ($j = 25; $j--; ) { $c += (int)(58 * $out[$j]); $out[$j] = (int)($c % 256); $c /= 256; $c = (int)$c; } if($c != 0){ throw new \Exception("address too long"); } } $result = ""; foreach($out as $val){ $result .= chr($val); } return $result; } function main () { $s = array( "1Q1pE5vPGEEMqRcVRMbtBK842Y6Pzo6nK9", "1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i", "1Q1pE5vPGEEMqRcVRMbtBK842Y6Pzo6nJ9", "1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62I", ); foreach($s as $btc){ $message = "OK"; try{ validate($btc); }catch(\Exception $e){ $message = $e->getMessage(); } echo "$btc: $message\n"; } } main();

Hope this clarifies your doubt. 

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answered Apr 11, 2022 by Soham
• 9,700 points

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