thumb|right|DAAU during the What Jazz!? festival in Hasselt DAAU (short for Die Anarchistische Abendunterhaltung) is a classical, jazz, experimental and multi-genre music group from Antwerp, Belgium.
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 0x0807badf9c16fb9437ab051e8475455dd8bf98dffabf6c9c82b9aae033246cd8. Chain 2 (Bitcoin): anchored in block 953980 (2026-06-16T17:16:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c0b0616-116f-4c53-9ea6-0b6d99c15ce0.json and https://artists.proofprofile.net/proofs/artist/2c0b0616-116f-4c53-9ea6-0b6d99c15ce0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).