Certificate of Pick Authentication #183 · 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: Power Fizz
Race: Newcastle (AW) · 27 June 2026 · 15:45
Product: Horses to Watch (Sly Man)
Advised odds: 11/4
Confidence: Medium
Prompt version: htw_backfill_v1
Predicted at: 2026-07-07T09:56:15.374351+01:00

Cryptographic Seal

Leaf hash: 98bfde9101b56aef249087925991db5e470eeaed7369c4ab2ea36b6da4d9ac3a
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":"htw_backfill_v1"},"committed_at":"2026-07-13T21:10:28Z","issuer":"saturday-racing.com","predicted_at":"2026-07-07T08:56:15Z","product":"horses_to_watch","product_lane":"","race":{"course":"Newcastle (AW)","external_id":"rac_11978785","internal_id":2016,"race_date":"2026-06-27","race_time":"15:45"},"schema":"sr-pick-v1","selection":{"advised_odds":"11/4","confidence_final":"Medium","confidence_raw":"","horse":"Power Fizz","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	982943c2f27c7e41bd6b6e77c1ea246f97c2debef77e28cc266b8a6dea669a32
2	right	df150a9c491e4b4e31bc3cfc71ccaec4b1f28c36dab3c0e78f132cf278b8dda9
3	right	09ead5e93cfe3d150dc89801e86f2d03c8ca9af41ebd22434a8c3414f4c366d1
4	right	567d199b4d3883ccdf9007923583636056512020ed229fbd4f7a22d03ff3bde4
5	right	32969f22a66e840a786dccb6b5ee6e302709d53b2206fb9aebccabc2478b63f7
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/