Certificate of Pick Authentication #1074 · 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: Mary
Race: Stratford · 19 July 2026 · 14:15
Product: Pick Winner (Mr Fox)
Advised odds: 7/2
Confidence: Medium
Prompt version: v3_b557cbd4
Predicted at: 2026-07-19T09:11:29.178434+01:00

Cryptographic Seal

Leaf hash: cb96f8e3b8cf873dcbb29e6bf7c7803cab7db65d5d4cd331fe2584215ba01a73
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":"v3_b557cbd4"},"committed_at":"2026-07-19T08:11:29Z","issuer":"saturday-racing.com","predicted_at":"2026-07-19T08:11:29Z","product":"pick_winner","product_lane":"","race":{"course":"Stratford","external_id":"rac_13000003458","internal_id":3071,"race_date":"2026-07-19","race_time":"14:15"},"schema":"sr-pick-v1","selection":{"advised_odds":"7/2","confidence_final":"Medium","confidence_raw":"Medium","horse":"Mary","position_claim":"win"}}