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 0x6015d91872d9e0a305268cb058b1838e6965b37dc89c9d8d2c70743d33fbdb4b. 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/8a075f15-be88-409d-a31c-0d79b9ce8d73.json and https://artists.proofprofile.net/proofs/artist/8a075f15-be88-409d-a31c-0d79b9ce8d73.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x9108534b9f612fc918a4962bb529769b5bcbcaf13813f707a0f34fa68a5f68f5. 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/BER181941501.
O clemens, o mitis, o coelestis pater, BuxWV 82
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedbe3d4f532edb335a69e8a5efb53fbe30d4d57a6ca728b96b6446bf3013fe79. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BER181941502.
David Pohle: Complete Sonatas & Ballet Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8694cf63051198a3c194d8580a4f68b6872bd3cbab34339972d0548dbc95ae. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BER182346015.
Monsieur Couperin. Louis, Charles, François I ? Pièces de clavecin
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
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.
Sinfonia decima settima a quatro violini
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035eecd59532a55fd0991f391321a8818f6b6743fbd3df19d4b2de65ff54d1ae. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BER181840401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf572e6b91c2856846fda9e0c68a69de4a7e0f1ff469e576ffa0470666461395c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BER181840404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0892ebfefbfd234a49b9690d86f1c8d0b4a79a6d456d428193a7bbaa117cecf3. 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/BER182245820.
Deuxième Suitte in C Minor: III. Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf27c6a666fc27deeb3ff71c5a25a0bfffca422af79cd117ea6e71e8f52a4f1db. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BER182245824.