Hors Piste is a 2018 CG animated short film directed by Oscar Malet, Léo Brunel, Camille Jalabert & Loris Cavalier during their studies at l'École des Nouvelles Images, French animation school. This s
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196b7e3dd4fc90d9d96a3721f3a0d163dc16479d938ccb8ca1ab6826ce4f788c. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c2777a6-8591-4574-87c9-b0fe9c263434.json and https://artists.proofprofile.net/proofs/artist/4c2777a6-8591-4574-87c9-b0fe9c263434.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).