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 0x0371d360c4b5a4c1f6cec197c3f86928afc9e8a28bfce13fa2c7552b5186b797. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4eb0da9e-c16f-4bad-9a06-db159a7978a7.json and https://artists.proofprofile.net/proofs/artist/4eb0da9e-c16f-4bad-9a06-db159a7978a7.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 0x0fd90a7e176b5d5338cfee217dcecaa46c11ca52818b24f4c04554a5be6c9ed8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKI199650101.
Dixit and Magnificat, K. 193: II. Magnificat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee3182936444493d87f13f6ab9829a5a9383b3d3241ebcd653ceaa0597000013. 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/HKI199650102.
Vesperae solennes de Dominica, K. 321: I. Dixit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x817d04c19ffaac9d1f02ee2e17c221299643a91acaee46192d081d9c127932da. 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/HKI199650103.
Vesperae solennes de Dominica, K. 321: II. Confitebor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2863b984d6a18a4df218456ac0d028c88b7ad18da7738c9a848262269ac79bb. 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/HKI199650104.
Vesperae solennes de Dominica, K. 321: III. Beatus vir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f6bb429e9a98a43389cc5b848f743c9d01472f04467da264c0a89289d35862. 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/HKI199650105.
Vesperae solennes de Dominica, K. 321: IV. Laudate pueri
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45740ee790e5e7fc63c6a73b6ca1bd9ab4c6fb6ef21af6fa334ddf199afaddf8. 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/HKI199650106.
Vesperae solennes de Dominica, K. 321: V. Laudate Dominum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd47ba1dcd7adeac53c01fea87a82672b2861fdb6fd4052c1a9ffa99c2ec7584. 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/HKI199650107.
Vesperae solennes de Dominica, K. 321: VI. Magnificat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d439ecfa2ef4f4130470385d55141a43506fc935d660de57852b676c9b84ce8. 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/HKI199650108.
Vesperae solennes de confessore, K. 339: I. Dixit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe14f7bd460c7b5b0d75669b73ea382a4aec4a197d1791e4c0642a906a41b86c. 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/HKI199650109.
Vesperae solennes de confessore, K. 339: II. Confitebor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7522e6c18b8ee5044b9e4778daeba32a2923dfbc32058465abefbf4e956b53. 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/HKI199650110.
Vesperae solennes de confessore, K. 339: III. Beatus vir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65ba4c988f66a2f3c21f1a6ef7f1b38125a7032b81dfc1bee3def714eb1adf0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/HKI199650111.
Vesperae solennes de confessore, K. 339: IV. Laudate pueri
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34373f61ffbeaabb3af3cf3ef70d0882852d95251504d5a4f8199c0680e0af5. 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/HKI199650112.
Vesperae solennes de confessore, K. 339: V. Laudate Dominum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb152bc5ff934a16a6d7270ea907586728a1c69cb7906036cfcd2a4abb9f2cc05. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI199650113.
Vesperae solennes de confessore, K. 339: VII. Magnificat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5490272a90af3bb2a37ff8e5b67cf321c9824ffde90896ffa3b14d70208d9673. 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/HKI199650114.