thumb|200px|Kukukuku men, 1931 The Angu or Änga people, also called Kukukuku (pronounced "cookah-cookah"), are a small group speaking a number of related languagesEthnologue: Languages of the World, 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb368768e3a8e9309465d5d0ef24efe721177aafb31002eab6228eb31f4c321d1. 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/623656ec-ea51-48e8-ad81-b2f5bf6d0d99.json and https://artists.proofprofile.net/proofs/artist/623656ec-ea51-48e8-ad81-b2f5bf6d0d99.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).