Proof of record

Every forecast we make and every page we capture is written once to an append-only ledger. At the end of each day the files are hashed into a manifest that names the previous day's hash, and the manifest is anchored to Bitcoin with OpenTimestamps. The hashes below are the same ones; keep a copy and you can check us later.

To verify a day: obtain the manifest file for that day from us, check that its SHA-256 matches the value above and that its prev_manifest_sha256 matches the previous row, then run ots verify on the accompanying .ots file. A forecast row named in a manifest existed, unchanged, by the time of that manifest. Updated 2026-11-02.