Certificate of Pick Authentication #309 · 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: Starlight Lass
Race: Yarmouth · 8 July 2026 · 15:15
Product: Top Rated Today (Sly Man) · Top Rated — Top Signals
Advised odds: 4/6
Confidence: Speculative
Prompt version: top_rated_v1_2026-07-08
Predicted at: 2026-07-08T22:13:45.158561+01:00

Cryptographic Seal

Leaf hash: 5a7d23051a5eb68299f44aacf45b474438271e0f1ff6108992275c9e6d4a574b
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":"Yarmouth","external_id":"rac_11990342","internal_id":2598,"race_date":"2026-07-08","race_time":"15:15"},"schema":"sr-pick-v1","selection":{"advised_odds":"4/6","confidence_final":"Speculative","confidence_raw":"","horse":"Starlight Lass","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	5a44aef28acf7c45409bf78bb96ff717b6572b5538c2807c99098df7b6f4d9bd
2	right	1bfe213e3c8c7fda5b9461f63f04dcdaf45781212036ff767f8f898d880687bc
3	left	70d0afafaec93a3e0779f6969f9bd7f593da9f72187b56d5fee2207e8c5b5a3c
4	left	de42128ab75b05c1180b53296e109b29d46a6c35f5c4a2161f5ae3eaa7ed546c
5	left	9c35144997c1f95839a65dfc94dc3a1139864f7417424a4c114d696b14c74df8
6	left	fc52f76fefc833e1107b03796f834d4ba1336aeb1778053c068d9688bda96b1d
7	left	abd1f2af8516869713aed81c9f26f27b73cfb533f542009e428008b662810a09
8	left	258ce92dcccd21d1d3bbbb39ac789ad1349e3db2aadbe660b7ed0a8637d8148f
9	right	a37bae6f6b56af99833b4e131855bb087cd4e3a90918a4dfd59d83ac87f8f303
10	right	e25c8d2b935f54f140bee5f6c7b02a176294b2ed6153543d94a92504abeba294

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