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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d149cac34dc646bdbd5c79fd66c732ca8236d0d1d6eb14633e9e656a2ae6c4e. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dac5e11c-28bf-4702-9e89-8a66a60afed5.json and https://artists.proofprofile.net/proofs/artist/dac5e11c-28bf-4702-9e89-8a66a60afed5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Fè chiff (feat. Daly, Debrouya, Riddla) [Bouyon version]