Can I sign a text with a Bitcoin address using PHP only?

I have the following...

Bitcoin Address: 1H2zzoAncRcQYihgTMYtX55ioXYErmYQQC

Public Key: 021FE07FBBB27AD176F1E082950474CD6252FB86751B893BC0887962B008830798

WIF Key: Kzy3fea4xCwLczAj3g8TYvDw6QRKCMqvVZX2J7vaXgy78VhieRdV

HEX Key: 6FCE4A50EA529B2D4B3E9671B5B0AA0D5D19266D778FB005F25AE4599D5D2BA0

I need to sign: Just a sample text

I want this result: H9saC8UiO0n++3dHZev/apRXkQCrqFofvW9vMpzWqPKsYTNvx/4bdtbdcMORGvNblQknT34UErnwEM3fxTZII0U=

How can I code it only in PHP without calling any API or invoking any JS library?

Midnight Engineer

Posted 2017-08-16T00:23:53.310

Reputation: 79

The ultimate documentation is the Bitcoin Core source code. So the short answer to your question is: read their code and reimplement in your language. – Nate Eldredge – 2017-08-16T01:02:27.350

BTW, never use this address for anything ever again since the priv key is published. – Willtech – 2018-03-11T01:20:02.367

Answers

A bit late but I created a PHP library for cryptocurrency. You can use this library to achieve what you want.

You can use it like this:

require('CryptoPHP.php');
$wif_key = 'Kzy3fea4xCwLczAj3g8TYvDw6QRKCMqvVZX2J7vaXgy78VhieRdV'; //this is your wif key
$private_key = $this -> wif2key($wif_key); //get the wif key to a hex private key
$hash = 'Just a sample text'; //this is what you're trying to sign.

$signature = $this -> sign($hash,$private_key);

user2298995

Posted 2017-08-16T00:23:53.310

Reputation: 113

Not working. Throwing Fatal Error. – Midnight Engineer – 2019-01-28T18:38:22.087

What error are you getting? – user2298995 – 2019-01-30T08:15:37.253

Fatal error: Using $this when not in object context in sign_message.php on line 4.

sign_message.php contains your code. – Midnight Engineer – 2019-01-30T11:52:59.653