("Works without opus number") (WoO), also Kinsky–Halm Catalogue, is a German musical catalogue prepared in 1955 by Georg Kinsky and , usually listing all of the compositions of Ludwig van Beethoven t
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 0xe05ffbad2e26474b106cc1103478f344d277f21fd928545207aa2a7802dcd114. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e340da15-90e5-4aa6-b6ae-43d96eb57310.json and https://artists.proofprofile.net/proofs/artist/e340da15-90e5-4aa6-b6ae-43d96eb57310.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).