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 0xcf642720f90e8c0ca22c957d616e4f608710a442acafdf8fe0fda89983ad6844. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eea5fa6f-2b2f-4bc2-b98b-85d11470d75a.json and https://artists.proofprofile.net/proofs/artist/eea5fa6f-2b2f-4bc2-b98b-85d11470d75a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Brahms, Mendelssohn, Schumann & Rheinberger: Organ Works
Windsbacher Knabenchor: Psallite, singt und klingt (German Christmas for Choir, Trumpet and Organ)
Sinfonies de Fanfares for Trumpet and Organ: I. Rondeau
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0x503a0d773a9aa88ff2377f23470d013e012ee8fa193cb0b86f70098eefac15fa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB240215101.
Sinfonies de Fanfares for Trumpet and Organ: III. Fanfares
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc077299c02a737da5324fb35fad90c93f4f07f231f6de0ac721199d54310b2cb. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB240215103.
Suite in D Major for Trumpet and Organ: I. Trumpet Tune (The Indian Queen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32fc4f924f9289bbcd0e404b5ed85bb405ce27b5f86e5908be35c3661323675. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB240215120.