diff --git a/internal_filesystem/lib/secp256k1.py b/internal_filesystem/lib/secp256k1.py
index faea1730..d9233fa2 100644
--- a/internal_filesystem/lib/secp256k1.py
+++ b/internal_filesystem/lib/secp256k1.py
@@ -2,10 +2,8 @@ import os
 import hashlib
 import binascii
 
-#from ._libsecp256k1 import ffi, lib
 from secp256k1_compat import ffi, lib  # Use compatibility layer
 
-
 EC_COMPRESSED = lib.SECP256K1_EC_COMPRESSED
 EC_UNCOMPRESSED = lib.SECP256K1_EC_UNCOMPRESSED
 
@@ -273,7 +271,7 @@ class PrivateKey(ECDSA):
         else:
             if raw:
                 if not isinstance(privkey, bytes) or len(privkey) != 32:
-                    raise TypeError('privkey must be composed of 32 bytes')
+                    raise TypeError(f'privkey must be composed of 32 bytes: {privkey} and {self.private_key} and {len(privkey)}')
                 self.set_raw_privkey(privkey)
             else:
                 self.deserialize(privkey)
diff --git a/internal_filesystem/lib/secp256k1_compat.py b/internal_filesystem/lib/secp256k1_compat.py
index e861816c..ac598c9c 100644
--- a/internal_filesystem/lib/secp256k1_compat.py
+++ b/internal_filesystem/lib/secp256k1_compat.py
@@ -1,7 +1,6 @@
 # secp256k1_compat.py: Compatibility layer for secp256k1.py to use MicroPython's usecp256k1 module
-# Mimics cffi's ffi and lib objects
 
-import usecp256k1  # Your MicroPython C module
+import usecp256k1
 
 # Constants (from libsecp256k1)
 SECP256K1_CONTEXT_SIGN = 1 << 8  # 256
@@ -11,52 +10,74 @@ SECP256K1_EC_UNCOMPRESSED = 0
 
 # Dummy ffi class to mimic cffi
 class FFI:
+    NULL = None  # Mimic cffi's NULL pointer
+
     def new(self, type_str):
-        # For 'unsigned char[74]' or 'size_t *'
-        if 'unsigned char' in type_str:
+        if 'char' in type_str:
             size = int(type_str.split('[')[1].rstrip(']'))
             return bytearray(size)
         elif 'size_t *' in type_str:
-            return [0]  # Simulate pointer to size_t
+            return [0]
         raise ValueError(f"Unsupported ffi type: {type_str}")
 
     def buffer(self, obj, size=None):
-        # Return bytes from bytearray or slice
         if isinstance(obj, list):
             return bytes(obj)
         return bytes(obj[:size] if size is not None else obj)
 
+    def memmove(self, dst, src, n):
+        if isinstance(src, bytes):
+            src = bytearray(src)
+        dst[:n] = src[:n]
+
+    def callback(self, signature):
+        # Simplified decorator to mark functions without setting attributes
+        def decorator(func):
+            return func  # Return func as-is
+        return decorator
+
 # Dummy lib class to map to usecp256k1 functions
 class Lib:
-    # Constants
     SECP256K1_EC_COMPRESSED = SECP256K1_EC_COMPRESSED
     SECP256K1_EC_UNCOMPRESSED = SECP256K1_EC_UNCOMPRESSED
     SECP256K1_CONTEXT_SIGN = SECP256K1_CONTEXT_SIGN
     SECP256K1_CONTEXT_VERIFY = SECP256K1_CONTEXT_VERIFY
 
     def secp256k1_context_create(self, flags):
-        # Context is managed by usecp256k1, return dummy object
         return object()
 
     def secp256k1_ecdsa_signature_serialize_der(self, ctx, output, outputlen, raw_sig):
-        # Call usecp256k1_ecdsa_signature_serialize_der
         try:
             result = usecp256k1.usecp256k1_ecdsa_signature_serialize_der(raw_sig)
             if result is None:
-                return 0  # Mimic libsecp256k1 failure
-            # Copy result to output buffer
+                return 0
             output[:len(result)] = result
             outputlen[0] = len(result)
-            return 1  # Mimic libsecp256k1 success
+            return 1
         except ValueError:
-            return 0  # Handle errors like invalid signature length
+            return 0
+
+    def secp256k1_ecdh(self, ctx, output, pubkey, seckey, hashfn=FFI.NULL, hasharg=FFI.NULL):
+        try:
+            result = usecp256k1.usecp256k1_ecdh(pubkey, seckey)
+            if result is None:
+                return 0
+            output[:32] = result
+            return 1
+        except ValueError:
+            return 0
 
 # Instantiate ffi and lib
 ffi = FFI()
 lib = Lib()
 
-# Feature flags (set based on your usecp256k1 module's capabilities)
+# Feature flags
 HAS_RECOVERABLE = hasattr(usecp256k1, 'usecp256k1_ecdsa_sign_recoverable')
 HAS_SCHNORR = hasattr(usecp256k1, 'usecp256k1_schnorrsig_sign')
 HAS_ECDH = hasattr(usecp256k1, 'usecp256k1_ecdh')
 HAS_EXTRAKEYS = hasattr(usecp256k1, 'usecp256k1_keypair_create')
+
+# Define copy_x for ECDH
+def copy_x(output, x32, y32, data):
+    ffi.memmove(output, x32, 32)
+    return 1
diff --git a/internal_filesystem/lib/secrets.py b/internal_filesystem/lib/secrets.py
index 29cf7e11..24bc87bf 100644
--- a/internal_filesystem/lib/secrets.py
+++ b/internal_filesystem/lib/secrets.py
@@ -1,5 +1,3 @@
-# By PiggyOS
-
 # secrets.py: Compatibility layer for CPython's secrets module in MicroPython
 # Uses urandom for cryptographically secure randomness
 # Implements SystemRandom, choice, randbelow, randbits, token_bytes, token_hex,
@@ -38,7 +36,8 @@ class SystemRandom:
     
     def _getrandbytes(self, n):
         """Return n random bytes."""
-        return bytearray(urandom.getrandbits(8) for _ in range(n))
+        # Use bytes directly for compatibility with CPython secrets
+        return bytes(urandom.getrandbits(8) for _ in range(n))
     
     def choice(self, seq):
         """Return a randomly chosen element from a non-empty sequence."""
@@ -86,17 +85,12 @@ def token_urlsafe(nbytes=None):
         nbytes = 32
     if nbytes < 0:
         raise ValueError("number of bytes must be non-negative")
-    # Base64 encoding: 4 chars per 3 bytes, so we need ceil(nbytes * 4/3) chars
-    # Generate enough bytes to ensure we have at least nbytes after encoding
     raw_bytes = token_bytes(nbytes)
-    # Use URL-safe base64 encoding (replaces '+' with '-', '/' with '_')
     encoded = ubinascii.b2a_base64(raw_bytes).decode().rstrip('\n=')
-    # Ensure length corresponds to nbytes (truncate if needed)
     return encoded[:int(nbytes * 4 / 3)]
 
 def compare_digest(a, b):
     """Return True if a and b are equal in constant time, else False."""
-    # Convert to bytes if strings
     if isinstance(a, str):
         a = a.encode()
     if isinstance(b, str):
@@ -105,10 +99,7 @@ def compare_digest(a, b):
         raise TypeError("both inputs must be bytes-like or strings")
     if len(a) != len(b):
         return False
-    # Constant-time comparison to prevent timing attacks
     result = 0
     for x, y in zip(a, b):
         result |= x ^ y
     return result == 0
-
-