Certificate of Pick Authentication #2 · 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: Kalokalo
Race: Southwell (AW) · 5 July 2026 · 14:02
Product: Pick Winner (Mr Fox)
Advised odds: 5/1
Confidence: Medium
Prompt version: v3_b557cbd4
Predicted at: 2026-07-04T22:17:41.655789+01:00

Cryptographic Seal

Leaf hash: bc09ef20c4c984837267b955c44c1c18322291d0600dd5cd8542b0b72136e145
Your browser: …
Batch: 13 July 2026 · 709 leafleaves · inspect batch →
Merkle root: eba1d4cb07b18df5f26ea6211dae664c2a8d9ce7bdcd95a3a7d9da03ed6cf62b
Your browser walk: …
On-chain: Off-chain verified. Anchoring on-chain is a separate, gas-gated step.

Technical appendix — canonical bytes & Merkle proof

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":"2026-07-13T21:10:27Z","issuer":"saturday-racing.com","predicted_at":"2026-07-04T21:17:41Z","product":"pick_winner","product_lane":"","race":{"course":"Southwell (AW)","external_id":"rac_11984921","internal_id":2499,"race_date":"2026-07-05","race_time":"14:02"},"schema":"sr-pick-v1","selection":{"advised_odds":"5/1","confidence_final":"Medium","confidence_raw":"Medium","horse":"Kalokalo","position_claim":"win"}}

The Merkle proof

Each hop is a sibling hash. Your browser walks these from the leaf up to the root, hashing pairs at each step.

#	Position	Sibling hash
1	left	bbb23d70915dee6e4e7ad986b53251a58292eda02be700ea9e0812468eafbf26
2	right	99677d53cc6d240278f57d98082ca5a282ab0106312844be4059310dc2bc142c
3	left	aa6faba997db9c2378b5ae431346dab25b27a8477d924a16ce6accbbf1abc184
4	right	59cc4486f4cb15337906d0dd0f391d907d1fdd587294c9cca2d0888c275bc5ee
5	left	013b5dd9bc44e968efcea842f4f2deae38d5bd63b39edfb080a29a12d494ea6a
6	right	204feec8495b2d1b806e60958c15c429141021ee238922bdfcbd4c87367079be
7	right	7b966ba7fb6479ee18f2a8f9b8925b3c3366b9fe81cdbeb08938a02c83890686
8	right	f384b0629d9042022b8062f38497000b02dafa843e81b7fba3c37144f3b49f92
9	right	559310ef76957df08e5f62efc49ff6649a36113b72a52a9a4471bd1801615514
10	left	f294ff8c83ee2bf537f6f3a850e09ef12f44b3915f1df793eb9ebfc3a7648f55

Server-reported status: off_chain_verified · Ledger overview at /verify/