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I've extracted the code to verify signed messages and make a standalone library https://github.com/chelahmy/dnrverify/ My intention is to implement a signed message verification function in PHP. I've tried https://github.com/BitcoinPHP/BitcoinECDSA.php and https://github.com/scintill/php-bitcoin-signature-routines but both failed to verify Denarius signed messages. They used the technique from this link https://crypto.stackexchange.com/a/18106 which seems to be different from the one used in Denarius. I noticed modular arithmetic is applied in Denarius code. So, I just extract the signed-message verification code from Denarius and see if I can make a PHP version. Digital signature has wide applications which should be initiated by the cryptocurrency world. Every digital wallet has private keys which are ready to be used to digitally sign anything, other than just to sign spending transactions. The other side of the applications just need to verify the signed something without necessarily going through wallets.