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 0xa5f1695059356756829d3fc7d6af51ca5f471cfc2b5064e84c5aafb8fa823f1d. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f797177-d9bd-4c26-ae86-836a39760e15.json and https://artists.proofprofile.net/proofs/artist/8f797177-d9bd-4c26-ae86-836a39760e15.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Recorder Music - Landini, F. / Thomas, S. / Buxtehude, D. / Vivaldi, A. / Muller, T.W. / Playford, J. / Mulligan, G. (La Spiritata 2)
Ye sacred Muses: Music from the House of Tudor
Flautando Köln - Werke für Blockflötenensemble
Prelude (Fantasy) and Fugue in C Minor, BWV 537: I. Fantasy (Arr. for Recorder Ensemble)
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 0x0c5416406c104e3b41c5e0303f6adab4e42faf72ae2baad48f53b4b4d05f3e5c. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/DEB111001901.
Stimmungsvolle Weihnachts-Klassik, Vol. 3
The English Dancing Master: Red House in G Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b1def400dcf86287f010ddf6a0110d6436a9e153165930ebf1ea855d6a850e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DESC71911001.
The English Dancing Master: An Italian Rant in G Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5430ca9f0f0b9bbc9f0191901888653edb5593857db2651d61512e1ba1d113ac. 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/DESC71911003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41db5efe9727f8da00ad9cc4b2f25899986c161d3ef5b74c3f34e99c27e18fa0. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/DESC71911007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e53a71a8742bb56529e3863cd24b1dcba61fa9112ed32f0944efdb9dd25d15. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DESC71911008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e33174bd677a5698e021bb0abdd4692de2855126e13e544df3488431fa88fe. 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/DESC71911023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fff84950b5b5810093e4ff5d26dc31283db268654fa458f2535955a8b614836. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DESC71911024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5430ca9f0f0b9bbc9f0191901888653edb5593857db2651d61512e1ba1d113ac. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DESC71911003.