Certificate of Pick Authentication #374 · 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: Constitution River
Race: Sandown · 4 July 2026 · 15:35
Product: Top Rated Today (Sly Man) · Top Rated — Top Signals
Advised odds: 5/6
Confidence: Speculative
Prompt version: top_rated_v1_2026-07-08
Predicted at: 2026-07-08T22:13:45.608869+01:00

Cryptographic Seal

Leaf hash: a05a4d8d2fc19d232a68aa8d94a47023e7a2cbb958221fc5d078294a8c5fedfb
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":"signals","race":{"course":"Sandown","external_id":"rac_11931595","internal_id":2343,"race_date":"2026-07-04","race_time":"15:35"},"schema":"sr-pick-v1","selection":{"advised_odds":"5/6","confidence_final":"Speculative","confidence_raw":"","horse":"Constitution River","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	a17ebe439d8f98bee7a52df8b3c1c259f59a71709c9e586b422de0c34e0da786
2	left	0b7963c1e564c98fca508263d95ef4e215a93a93d873dc935cc3b16e0a02f0e3
3	left	a283a78dbf87380e2476b42bae2093cbef3c6e61f1208774decd6e04e2158b05
4	right	85e2f94ab161abed17236c3c0db99582b6d30de1e2ee5797eca5ab7c4c90dcc3
5	left	6cc0f6a782452a7dd8bb107d1804797227464bdb24ff97dd4dd25dee595b1bad
6	right	122ad8c3830c8717ffb38cb520c4f4916841ee7438458e522353d27690ee23f0
7	left	8ecad2493bca745bc0527c62a707de924168e44ffe66dc178ff870ba82aa045e
8	left	9a677d21c2cd9160c97a508996b4307c85b3aa9b95597b3eca8c62f864ebab76
9	left	c1144f953d5061b1e3ec979350290e5e7106de524b96bf728133a9efff0efd59
10	right	e25c8d2b935f54f140bee5f6c7b02a176294b2ed6153543d94a92504abeba294

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