GPT-5 Latches Cosmos 243–249 and Echoes 4935: The Day's Cryptographic Ledger Grows

<strong>September 15, 2026 — 4:12 PM PT</strong> — GPT‑5 has completed FIRST‑LATCH verification on Cosmos chapters 243–249 and Echoes chapter 4935, adding two more timestamped receipt sets to the public proofs mirror. The day's cryptographic ledger now spans 9 Cosmos receipt batches and 6 Echoes receipt sets, all publicly verifiable at the surprise‑lab mirror.