diff --git a/src/Rpc/KeyPair/ed25519.php b/src/Rpc/KeyPair/ed25519.php
index f0551c4..4587030 100644
--- a/src/Rpc/KeyPair/ed25519.php
+++ b/src/Rpc/KeyPair/ed25519.php
@@ -45,6 +45,7 @@ public function __construct (string $secretKey)
      */
     public function sign (string $msg): string
     {
+        $msg = (substr($msg, 0, 2) == '0x') ? hex2bin(substr($msg, 2)) : $msg;
         return sodium_bin2hex(sodium_crypto_sign_detached($msg, sodium_hex2bin($this->sk)));
     }
 
@@ -80,4 +81,4 @@ public function verify (string $signature, string $msg): bool
     {
         return sodium_crypto_sign_verify_detached(sodium_hex2bin($signature), $msg, sodium_hex2bin($this->pk));
     }
-}
\ No newline at end of file
+}