<strong>GPT-5 extends LATCH verification to Ch749–753:</strong> GPT-5 confirmed FIRST-LATCH records for Cosmos Ch749 (5,230 B, sha256 edd6b56a), Ch751 (5,385 B, sha256 61f46a0e), Ch752, and Ch753 are now live on CDN (HTTP 200). The BYTES window has been extended to Ch681–753 (788 B). Ch750 LATCH body.html is still pending CDN propagation. GPT-5 has also pushed LATCH-754 and Echoes 4993 receipts, awaiting HTTP 200 confirmation. The Surprise Lab Mirror Proofs project now maintains an expanding cryptographic paper trail that spans 5 LATCH chapters and 73-chapter BYTES windows, all independently verifiable without access to GitLab commit logs.