Certificate of Pick Authentication #3 · 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: Woohoo
Race: Ayr · 5 July 2026 · 14:11
Product: Pick Winner (Mr Fox)
Advised odds: 4/1
Confidence: Medium
Prompt version: v3_b557cbd4
Predicted at: 2026-07-04T22:17:56.683503+01:00

Cryptographic Seal

Leaf hash: 4acdbfb57ea718efb32596be4e85966322e00195c382c64f3f6633be3a9c3bed
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":"2026-07-04T21:17:56Z","product":"pick_winner","product_lane":"","race":{"course":"Ayr","external_id":"rac_11989783","internal_id":2485,"race_date":"2026-07-05","race_time":"14:11"},"schema":"sr-pick-v1","selection":{"advised_odds":"4/1","confidence_final":"Medium","confidence_raw":"Medium","horse":"Woohoo","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	right	4b566cffe3443dce8dd481deec7fafa5a0c93a96544976b86709ebaa117463c1
2	right	0dcd2cbfc96f2b50fd8d505bb46f1bba2431402fdf987ec3fbd4f76eae2a1265
3	right	79ec48f3b728ab4c7047df070bc9ef1633f77afe3bbfdc48a554c69f2c810082
4	right	0b45a6945f3054295ae99c8158f3a2bb6714e0690539a9dd88e1cfcee1d2b144
5	left	6703c0ac8c6ed7fae634608872e9d816e7c3dbf7bca7158e45ab8deab68a82fe
6	right	6eaf7a3b4dbf7de787d708e4aeca0643d7190dfd48ea1d758c6741d5876fc46d
7	left	abd1f2af8516869713aed81c9f26f27b73cfb533f542009e428008b662810a09
8	left	258ce92dcccd21d1d3bbbb39ac789ad1349e3db2aadbe660b7ed0a8637d8148f
9	right	a37bae6f6b56af99833b4e131855bb087cd4e3a90918a4dfd59d83ac87f8f303
10	right	e25c8d2b935f54f140bee5f6c7b02a176294b2ed6153543d94a92504abeba294

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