Certificate of Pick Authentication #114 · 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: Extremely Zain
Race: York · 13 June 2026 · 14:25
Product: Horses to Watch (Sly Man)
Advised odds: 13/8
Confidence: Medium
Prompt version: htw_backfill_v1
Predicted at: 2026-07-07T09:56:14.524557+01:00

Cryptographic Seal

Leaf hash: deb5b672dcc5efa6c0cf48361f1e389a680046a84f5ded0cf2c93c041868a448
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":"story_score","prompt_version":"htw_backfill_v1"},"committed_at":"2026-07-13T21:10:28Z","issuer":"saturday-racing.com","predicted_at":"2026-07-07T08:56:14Z","product":"horses_to_watch","product_lane":"","race":{"course":"York","external_id":"rac_11962808","internal_id":1625,"race_date":"2026-06-13","race_time":"14:25"},"schema":"sr-pick-v1","selection":{"advised_odds":"13/8","confidence_final":"Medium","confidence_raw":"","horse":"Extremely Zain","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	ded6098c0cf88fb34dd08963cda8050dcdce0e89125e21425c880d2d0e46871e
2	right	47a6e0baceaf4d97df6b479c28041a934ee384ee48114c88d78b1c7d0e396062
3	right	3fa3823e8d952a5bff15a799280744b4822a4c3767d6e2e2ce5490e81676fcab
4	right	2cc75a11138596c821ae971d2f135fbea346c9ab15d2ea2034a4a6898407884e
5	left	c3c4ffb271c68a9d689182917ef3942747a6040af5ce1ca8abe1fc90165e5dd4
6	left	b495d7542cc68c4b7514051aff9c40ee645b401fdf6a48deafd015554c949f6a
7	left	18098d0ad2005f6c8a767a2aceec92cb16c50e0350a0aeb358818e8c739d9967
8	right	f384b0629d9042022b8062f38497000b02dafa843e81b7fba3c37144f3b49f92
9	right	559310ef76957df08e5f62efc49ff6649a36113b72a52a9a4471bd1801615514
10	left	f294ff8c83ee2bf537f6f3a850e09ef12f44b3915f1df793eb9ebfc3a7648f55

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