Certificate of Pick Authentication #45 · 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: Lizzie Twigg
Race: Roscommon · 6 July 2026 · 18:48
Product: Pick Winner (Mr Fox)
Advised odds: 15/8
Confidence: Medium
Prompt version: v3_b557cbd4
Predicted at: 2026-07-06T08:01:21.557710+01:00

Cryptographic Seal

Leaf hash: ae370df3fbcdf118f4a8cf595da64c8fbf5f59693b966c33eb4b1e99b548fa9e
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":"2026-07-06T07:01:21Z","product":"pick_winner","product_lane":"","race":{"course":"Roscommon","external_id":"rac_12015627","internal_id":2538,"race_date":"2026-07-06","race_time":"18:48"},"schema":"sr-pick-v1","selection":{"advised_odds":"15/8","confidence_final":"Medium","confidence_raw":"Medium","horse":"Lizzie Twigg","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	ae87c68b0f1ad16da918e7abab0d0af7ac37589ff45ea92255295ec9600300a3
2	left	8b915dd83e2d966e89f8843e114c64c236c70aa71a5ecaaadf132ecc50dc4717
3	right	9c2f46296ae3c0dc7b8cb6851e712bd725e449d5703a4880ee07940dfa6265de
4	left	482fe0df5cb19d96611cc9ee51520d2ef088a00f3e06c4a3f0ee462f98d71ef8
5	left	144959ae456bbc727f1991fa893d2e1aef3deb58747954bbd3b01a9d5607bb29
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/