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 0xb8cf1151b09f745d6075c3a9828a150c7c2b2a268291ccf9b0706555a5e8375c. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ad371cd-54fb-4f4a-8e1b-72e87dddb639.json and https://artists.proofprofile.net/proofs/artist/5ad371cd-54fb-4f4a-8e1b-72e87dddb639.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mahboul le Sage et autres contes marocains (Contes et histoires)
Morocco: Songs, Rhythms to Dance and Lullabies