Certificate of Pick Authentication #13 · 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: Fringill Dike
Race: Market Rasen · 5 July 2026 · 16:00
Product: Pick Winner (Mr Fox)
Advised odds: 6/4
Confidence: Medium
Prompt version: v3_b557cbd4
Predicted at: 2026-07-04T22:20:28.533628+01:00

Cryptographic Seal

Leaf hash: 73088efcd84e2f8c2daf87f3e4bfcd3e0af93b63d1e495f856ad22986dd3e9a8
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":"2026-07-04T21:20:28Z","product":"pick_winner","product_lane":"","race":{"course":"Market Rasen","external_id":"rac_11987521","internal_id":2496,"race_date":"2026-07-05","race_time":"16:00"},"schema":"sr-pick-v1","selection":{"advised_odds":"6/4","confidence_final":"Medium","confidence_raw":"Medium","horse":"Fringill Dike","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	73d33e8eca175aefb8c82243a2e5eac9905921e7298e42183b230987d7bd86d8
2	right	d6530f312fa620492ed91ce2d488b5cbc15a35468b16e93761f266404ea89459
3	right	f1b9058b358a310dcaeaf857df9baf55d81664e9ad16f9139a0cd218aa073304
4	right	92f5180577ccd31050b2d74b4414b4d5b9882282cc01cbe86e04c574283dcd01
5	left	200f5868f8605f5ad05cb5d5a0f64bb9ef0d04aa83b4e59e3878109d60cf7510
6	right	11a3ade288925daffe08c7c49239d533eac4edd4330aa411ec5a586d3ef88887
7	left	b20426c9805bd5f17d7d0c3747a91f6539d868cc80d6de1f3197b66c180d007b
8	right	f1c99ba68a2d45d1bb79f40edc8b534afd41f7a23fe00327643be3c20b514374
9	left	c1144f953d5061b1e3ec979350290e5e7106de524b96bf728133a9efff0efd59
10	right	e25c8d2b935f54f140bee5f6c7b02a176294b2ed6153543d94a92504abeba294

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