diff --git a/src/Kore.php b/src/Kore.php
index 7744c2a..6a8766d 100644
--- a/src/Kore.php
+++ b/src/Kore.php
@@ -14,18 +14,17 @@ class Kore
 
     public function __construct() {}
 
-    public function signBody($body, string|array $key, string|bool $password = false)
+    public function signBody(string|array $body, string|array $key, string|bool $password = false)
     {
         $privateKey = PublicKeyLoader::loadPrivateKey(base64_decode($key), $password);
-        $sig = $privateKey->sign($body);
-        $sig = base64_encode($sig);
-        return $sig;
+        $sig = $privateKey->sign(json_encode($body));
+        return base64_encode($sig);
     }
 
-    public function verifySignature($signature, $message, $key)
+    public function verifySignature(string $signature, string|array $message, $key)
     {
         $publicKey = PublicKeyLoader::loadPublicKey($key);
-        return $publicKey->verify($message, $signature);
+        return $publicKey->verify(json_encode($message), $signature);
     }
 
     public function testRequest()