Certificate of Pick Authentication #522 · 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: Croupier
Race: York · 10 July 2026 · 14:10
Product: Top Rated Today (Sly Man) · Top Rated — Top Market Movers
Advised odds: 12/1
Confidence: High (raw 70)
Prompt version: top_rated_v1_2026-07-08
Predicted at: 2026-07-10T09:41:59.480486+01:00

Cryptographic Seal

Leaf hash: a4bd0ede5b5cb3d7a4ec6ecaf4b0d4fac4fbb6766e2eb90e1786c58e6a667a8e
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":"2026-07-10T08:41:59Z","product":"top_rated","product_lane":"movers","race":{"course":"York","external_id":"rac_11991278","internal_id":2679,"race_date":"2026-07-10","race_time":"14:10"},"schema":"sr-pick-v1","selection":{"advised_odds":"12/1","confidence_final":"High","confidence_raw":"70","horse":"Croupier","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	a4f689500fa22e9f6bdeb845e663395930bb13adeb932d1224b45cd2d2f01b31
2	right	d7a4405a0bafee5dd7aef8762bf8421df64d73d8a4cb7a1fb370804d6175e8e3
3	right	8ddeccc0de738282cb3ef4959453fca62c8aad33eea132e0660fc39d2e1d532e
4	right	558267fdd40b27fe6b2a28899db957ae8a4eb32de530085ca0893768e3535b84
5	right	ab7be46c71776e90ed1be2d05579d318bc824c9a02b32e020e96e77b4dec4ce1
6	left	a0db52a97d82a2741b38fc0eeb784af6793ea6882d82b807019bad2067115cb4
7	left	8ecad2493bca745bc0527c62a707de924168e44ffe66dc178ff870ba82aa045e
8	left	9a677d21c2cd9160c97a508996b4307c85b3aa9b95597b3eca8c62f864ebab76
9	left	c1144f953d5061b1e3ec979350290e5e7106de524b96bf728133a9efff0efd59
10	right	e25c8d2b935f54f140bee5f6c7b02a176294b2ed6153543d94a92504abeba294

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