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 0x2af22450bc8132a17f8707412e10a1df59a0fa1541c698cbbd8f2d327372c94c. 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/901a94be-0b26-4e06-b7c7-a040436efefe.json and https://artists.proofprofile.net/proofs/artist/901a94be-0b26-4e06-b7c7-a040436efefe.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Jean-Marie Leclair: A Portrait, Sonatas and Dances
5ème Sonate pour violon et basse continue en la mineur (4ème livre) Op. 9 No. 5: III. Adagio
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 0xdf22a32a8de93afd191cb578ef619756c9a31d9622d0dcdfac8ee49dbe72a359. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CH1262002605.
5ème Sonate pour violon et basse continue en la mineur (4ème livre) Op. 9 No. 5: IV. Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab49717c5fc702019596febcf4aa31bccc3ae2d7ae86c1a42ca215589ce86d47. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CH1262002606.
3ème sonate pour violon et basse continue en ré majeur (4ème livre) Op. 9 No. 3: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2d399ff5f15bb4ef196f561d3fd6e16bfd14d285aa31e1da5064cd342ce1c2. 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/CH1262002609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed88199e9137f1fbd95fb735a0ab634da325cdbadcec2e7b1a9308309a9b031. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CH1262002613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c6e1d280395c979203cab66dfa1d5fcf3ee10d491c14f78ac73907c1566539. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/CH1262002618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb580ad80af21643a3dbed0baeeb217fd17ae9cb52d3acf0957ad8aa1b92df962. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/CH1262002619.