Certificate of Pick Authentication #9 · 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: Altareq
Race: Ayr · 5 July 2026 · 15:15
Product: Pick Winner (Mr Fox)
Advised odds: 11/8
Confidence: Medium
Prompt version: v3_b557cbd4
Predicted at: 2026-07-04T22:19:27.357869+01:00

Cryptographic Seal

Leaf hash: c78d5f93594ed5d62211e1f755e29478dc5f5eeab70c4c4f40e7ef92836181c4
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":"2026-07-04T21:19:27Z","product":"pick_winner","product_lane":"","race":{"course":"Ayr","external_id":"rac_11989757","internal_id":2487,"race_date":"2026-07-05","race_time":"15:15"},"schema":"sr-pick-v1","selection":{"advised_odds":"11/8","confidence_final":"Medium","confidence_raw":"Medium","horse":"Altareq","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	c776e57cde98a22b53ad4708fbb69d270cc0d34592a4df13d09dcc7498998c62
2	right	9888ece341a4ec8998f8cf33f738780ef84c6ce6679d8e8c89f92575d31d32f9
3	right	5827dee87b5a18cb9cd3bba08273cceed11f0ea450b6b0e9697de80871e1acd3
4	right	3fcba72da54d2e0c4e2a299d4d179c0d6e529e9699977ed6554f3035b0c3b1d1
5	left	1f43b9fe857f8bff074e76ca1389e5156ba5338ce2270feac8af71847ba29692
6	left	acddd189171186c8bc352e9e4ff896c2fac95bec250bde9a776ff5b7544bdba3
7	right	7b966ba7fb6479ee18f2a8f9b8925b3c3366b9fe81cdbeb08938a02c83890686
8	right	f384b0629d9042022b8062f38497000b02dafa843e81b7fba3c37144f3b49f92
9	right	559310ef76957df08e5f62efc49ff6649a36113b72a52a9a4471bd1801615514
10	left	f294ff8c83ee2bf537f6f3a850e09ef12f44b3915f1df793eb9ebfc3a7648f55

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