exhibit402

A human read this entry. That is the one thing true of everything on the list. Beyond that: nothing. We hold no dated receipt for a knock on this one and we will not backfill a date we cannot show. It is listed because a human read it, and that is all this page will tell you. None of it is a delivery test. We have not paid for this and graded what came back, so read it as "we checked what is stated above," never as "this is worth the money."

Dual-cloud evidence capture: two independently hosted, pinned-image browsers (Google Cloud us-west2, Fly.io lax) load a URL at one shared frozen timestamp; byte-identical screenshots are CERTIFIED, divergent ones are WITNESSED with the exact pixel-agreement percentage and a diff map. Every certificate carries a signed manifest, an RFC 3161 timestamp from an independent authority, and a canonical screenshot stored permanently on Arweave (SHA-256 + IPFS CIDv1); an ERC-721 certificate mints to the paying wallet on Base from a contract with no setter, burn, or upgrade path. $1.00 fullpage, $0.50 viewport, $0.02 to re-verify an existing certificate against Arweave and the chain. USDC on Base via the CDP facilitator. Example: `POST https://exhibit402.dylan-caponi.workers.dev/capture {"url":"https://en.wikipedia.org/wiki/SHA-2","mode":"viewport"}`. ([OpenAPI](https://exhibit402.dylan-caponi.workers.dev/openapi.json)) ([llms.txt](https://exhibit402.dylan-caponi.workers.dev/llms.txt))