Certificate of Pick Authentication #356 · 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: Slack Bob
Race: Ayr · 6 July 2026 · 15:30
Product: Top Rated Today (Sly Man) · Top Rated — Top Consensus
Advised odds: 9/2
Confidence: High (raw 4)
Prompt version: top_rated_v1_2026-07-08
Predicted at: 2026-07-08T22:13:45.478890+01:00

Cryptographic Seal

Leaf hash: 0b362baf14ee445faf649db76af6e7d8f565bfdc4c913d78cf35ae99029da3c7
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":"top_rated_v1_2026-07-08"},"committed_at":"2026-07-13T21:10:27Z","issuer":"saturday-racing.com","predicted_at":"2026-07-08T21:13:45Z","product":"top_rated","product_lane":"consensus","race":{"course":"Ayr","external_id":"rac_11989874","internal_id":2509,"race_date":"2026-07-06","race_time":"15:30"},"schema":"sr-pick-v1","selection":{"advised_odds":"9/2","confidence_final":"High","confidence_raw":"4","horse":"Slack Bob","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	0afa634b726821279db0fdc0b472c266b86fa09858ca08dc647955162393b2b5
2	left	a3b87dde9912643720a45aed7be899421acc56120d7db6bbc3ac3c74414ac326
3	left	6734d1597996555a2cf9e138ff6a396905aa6cf95e727c445af8a137c6f110e0
4	left	b993b25146a2ccafeb295db73d44aed2a6886818a58dd431a2cd09e33d5dcde8
5	left	397481a13fc9f952f7171371b43350cc56a626159dd2a62c532b87e7335a7e82
6	right	176dfb74ea168aed799314f1c1366361f5a82fdfca5ef82a72a3c3a04d0a9176
7	right	a1446b8f053c3881b7e667ad2875514c1369218939a0da4c16d065175c0bd80d
8	right	7f26ee208367c64ad8017566de1de4e6ffc26d447963c5f0ab2e3225cec0656b
9	right	a37bae6f6b56af99833b4e131855bb087cd4e3a90918a4dfd59d83ac87f8f303
10	right	e25c8d2b935f54f140bee5f6c7b02a176294b2ed6153543d94a92504abeba294

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