Certificate of Pick Authentication #13694 · Saturday Racing

Verifying in your browser…

Hashing the pick's canonical bytes with your device's SHA-256.

This is to certify that the pick recorded below was cryptographically committed to Saturday Racing's transparency ledger before the race ran. The commitment is a SHA-256 leaf hash of the canonical bytes; any subsequent tampering breaks the hash and this certificate turns red. The check runs on the reader's own device — no trust required from us.

The Pick

Horse: Limestone
Race: York · 22 August 2026 · 14:25
Product: Pick Winner (Mr Fox)
Advised odds: 4/1
Confidence: Speculative (raw Medium)
Prompt version: v4_64c1ea86
Predicted at: 2026-08-22T09:18:51.229489+01:00

Cryptographic Seal

Leaf hash: 6e8a5fb9b3d7c1c2cd94a306468c7fd889b765ad55c46503b9b9a26f80386622
Your browser: …
Batch: Not yet batched. The end-of-day Merkle tree hasn't assembled yet — the leaf hash above is nonetheless independently verifiable now.

The canonical bytes

This is the exact JSON that was hashed. Copy it, run sha256sum on it yourself, and you should get the leaf hash above.

{"attribution":{"pick_source":"llm","prompt_version":"v4_64c1ea86"},"committed_at":"2026-08-22T08:18:51Z","issuer":"saturday-racing.com","predicted_at":"2026-08-22T08:18:51Z","product":"pick_winner","product_lane":"","race":{"course":"York","external_id":"rac_32295120052","internal_id":4362,"race_date":"2026-08-22","race_time":"14:25"},"schema":"sr-pick-v1","selection":{"advised_odds":"4/1","confidence_final":"Speculative","confidence_raw":"Medium","horse":"Limestone","position_claim":"win"}}