Certificate of Pick Authentication #642 · 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: Lucky Sevens
Race: Stratford · 12 July 2026 · 13:50
Product: Top Rated Today (Sly Man) · Top Rated — Top Signals
Advised odds: 5/4
Confidence: Speculative
Prompt version: top_rated_v1_2026-07-08
Predicted at: 2026-07-12T09:38:16.804970+01:00

Cryptographic Seal

Leaf hash: e8e28dc39c17c80931131ab5cec87d3b78095f8918e7a371664a41e3623405e1
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":"2026-07-13T21:10:26Z","issuer":"saturday-racing.com","predicted_at":"2026-07-12T08:38:16Z","product":"top_rated","product_lane":"signals","race":{"course":"Stratford","external_id":"rac_11987898","internal_id":2763,"race_date":"2026-07-12","race_time":"13:50"},"schema":"sr-pick-v1","selection":{"advised_odds":"5/4","confidence_final":"Speculative","confidence_raw":"","horse":"Lucky Sevens","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	e8ab395d68ca8a313a656a66804c5e98c898aa77193cf61b602e72091f7c3ac2
2	right	a26a9f704c04c7ffa5def904a57585b20f059eb78dc476a2a8583025f463d5f9
3	left	b9b1badad899c23f3f8a9724e255b468189149c4f6334fe49e2066b15a3bb57c
4	left	f4ba71f6e3bd585f070eb3ac852496e12ab993c7f51cf033f7895aad8996046d
5	right	3e35cbb152ebdc46b7a561064613c01e3e78fc967395af21bb7fe503b0a56b43
6	right	da3d768220597c0636847e1f28e766d918af491f20ffa568c070cdc81dea7c6a
7	right	7b91ffdbc0775ceb1efdc9c047cbf134a340783b2dc1627173e9cef778ec1cf8
8	left	5029b4611810c87e9e04fd3af160ed33fa21436626c66ccbd825c959f40bd90c
9	right	559310ef76957df08e5f62efc49ff6649a36113b72a52a9a4471bd1801615514
10	left	f294ff8c83ee2bf537f6f3a850e09ef12f44b3915f1df793eb9ebfc3a7648f55

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