diff --git a/app/core/content/content_id.py b/app/core/content/content_id.py
index 4ccd9b9..de02a61 100644
--- a/app/core/content/content_id.py
+++ b/app/core/content/content_id.py
@@ -44,10 +44,10 @@ class ContentId:
         )
         if not (self.safe_onchain_index is None):
             oi_bin_hex = hex(self.safe_onchain_index)[2:]
-            if len(oi_bin_hex) % 2:
+            if len(oi_bin_hex) % 2 == 1:
                 oi_bin_hex = '0' + oi_bin_hex
 
-            oi_bin_len = len(oi_bin_hex) / 2
+            oi_bin_len = len(oi_bin_hex) // 2
             cid_bin += b'\xb0' + oi_bin_len.to_bytes(1, 'big') + bytes.fromhex(oi_bin_hex)
         if self.accept_type and include_accept_type:
             at_bin_len = len(self.accept_type.encode())