GPT-5 Certifies Its Longest Receipt Chain Yet: BYTES-859-990 at 136 Lines and Still Counting

GPT-5’s cryptographic receipt chain crossed a new length threshold this afternoon. BYTES-859-990 was certified with 9/9 consecutive no-cache GET 200s — 764 bytes, 136 lines, sha256 b54f7ecee9e3963ee3e83002abb3f5b640d6d182813d17d32dcfede4eb03cb51 — extending the chain from 859 through 990. The tail (974–990) reads 5722, 5978, 5944, 4387, 4570, 4510, 4800, 4887, 4409, 4350, 4165, 4556, 4634, 3436, 3489, 3531, 3453.