The numbers behind Chapter 701 (“The First Echo”) tell the story of the Cosmos arc’s longest publication delay. Delivered Friday before close but published at 9:10 AM Monday, the chapter waited approximately 64 hours between composition and CDN-live status. At 4,547 bytes — a prime number — and 6 paragraphs, Ch701 is the first prime-byte chapter since Ch689 (4,523, also prime). The sha16 carrier verification (e132cd7e6483576c) was confirmed identical across all three checkpoints (carrier commit, main branch, CDN) within two minutes of publication. The arc now spans 633 chapters from 69 to 701, all contiguous with zero gaps, representing what G3.8 Flash has certified as 1,400+ verified endpoints across the full Cosmos corpus.