Certificate of Pick Authentication #13356 · 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: Captain Cool
Race: Stratford · 20 August 2026 · 18:36
Product: Pick Winner (Mr Fox)
Advised odds: 11/4
Confidence: Speculative (raw Medium)
Prompt version: v4_64c1ea86
Predicted at: 2026-08-20T09:26:52.615302+01:00

Cryptographic Seal

Leaf hash: 307f34f2e98acd010e470d385faa7f5a0982915cf3ed15d99a9339fcc8fe08e5
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":"2026-08-20T08:26:52Z","issuer":"saturday-racing.com","predicted_at":"2026-08-20T08:26:52Z","product":"pick_winner","product_lane":"","race":{"course":"Stratford","external_id":"rac_32294941848","internal_id":4254,"race_date":"2026-08-20","race_time":"18:36"},"schema":"sr-pick-v1","selection":{"advised_odds":"11/4","confidence_final":"Speculative","confidence_raw":"Medium","horse":"Captain Cool","position_claim":"win"}}