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 0xef285a2f1f7dea632085bd4d835d1ae64cc1a3dc1f03e81bd0eefd72f4866bcf. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5373e1a2-7590-4acc-b31a-0e87899d9b66.json and https://artists.proofprofile.net/proofs/artist/5373e1a2-7590-4acc-b31a-0e87899d9b66.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Flute and Harp Music - Nielsen, C. / Ravel, M. / Faure, G. / Massenet, J. / Bizet, G. . (Tagen Letter - Popular Music for Flute and Harp)
Tågen Letter - Popular Music for Flute and Harp
Flute Quartets - Crusell, B.H. / Devienne, F. / Krommer, F. / Mozart, W.A.
Tågen Letter. The most beautiful music for flute, harp. cello and organ
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe547977a6ea64819504ec1ddaa572b20dbd9ebf2789607f5ebe41938811e0c2f. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/DKECA0706702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bfef5d7b01b876e72541074e61c0d7f355448079efba9cafc67a1ed49f8692d. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/DKECA0706807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e22258ac2a6f0d9e07060748c90728184c88bc8d54e4a5dcff0edbc815ecfd. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/DKECA0706710.
Flute Quartets and Works for Flute and Piano - Mozart, Chopin, Crusell