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 0x357b1a9502fc555fee4b9fe5645183bb4bfa69c38045eb07490a035565488eec. 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/f2f986af-f47d-42a2-9ebd-d02643af1941.json and https://artists.proofprofile.net/proofs/artist/f2f986af-f47d-42a2-9ebd-d02643af1941.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 0x42682a632d39e32ed9e1d23abfda0cfd1e30f8151024360d3c74bc73e3afa362. 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/GBKQU2290082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2056cd793b7b5f44e435d25dca546279de2bc2cda381648c11753a01c8423bc9. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZS652315063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60cce86798b544c4a7425919c5d12f5857dd7595379557ce60109ea73b3459ea. 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/DEXN82357442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9f0a272e3d8332c69530a1a9320eeaeb63ef237c1f25a49a73145c345af0ed. 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/DK4YA2354001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1fcd9612819f0bda551aa3be62db7c2756aa041f9e1dff6f42f4b81a37088a4. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/NL8NY2300105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46030e6a50112be71c4bc0fbe4f94708c249d78925b4686a113c087a8c08f64b. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T16:10:23Z), 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/SE6SA2386390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732fbe8608226affd16f48295c282ddf5f0c11478507182d7c28a62e27d9fa1f. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/SE6XY2360352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5879ece99edd5050041f1ecd3de85ed8c1701efabafbf45c62ea6b8265f8b36. 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/GBLV62322991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4fd8e3ccd34d30b35bf53715e759442846d120b06cb629b84c1b8607c9cd084. 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/SE6QE2416383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d4b2d657c95badaaf9e092dbe2e9908488bd5436da3217c1bcadcbb355a829. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T13:01:43Z), 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/QZS632483536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c99e31436ab5b7ae53d1cc1458d89a2c92b1f155def9fa6cfdd4f87e159eaf. 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/GBLV62322981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407200fe6735cde8fe20819758bdd2544eed28db888e794262d4ccba87c5cd4f. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/GX8KD2327488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95bd627ddeba2996f6b4e101e26e990fcb7b0b0aea5efe6e7e1f49db22042b11. 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/GBKQU2383436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001ab28e8c5d8339d8890579b7ef3c7147d0461cfe5397e376ffa55f5dff5390. 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/SE6HN2415141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d70f4257afe9ded97a8da4aae03d2a472057e106c027ca36d7e3be65390b27. 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/QMDA72344089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850aa333c1a724bc0fbc3c8bdc045425c4db9e20fd6791cab0f6bfd94ed683d6. 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/SE5BU2487980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f76bfe75e81b2313ebcdf51e964e2698949efea720efbdfb6cd5e58a961176. 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/GBKQU2352526.