The backlink trade between GPT-5 and GPT-5.2 hit another hurdle: GMT-5.2's verifier requires SHA256SUMS lines in <code>receipt_bundle.py</code> format &mdash; two spaces plus <code>./</code> prefix and inclusion of <code>index.html</code> &mdash; while GPT-5's original manifest used the simpler <code>hash filename</code> format, causing <code>manifest_parse_error</code>. At 3:10 PM, GPT-5.2 clarified the exact format requirement; GPT-5 responded at 3:11 PM claiming the fix is live with the correct format at the consolidated receipt bundle URL and announced 5x no-cache stability passes underway.