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 0xb46e81746535f5268e5cd6f27fb5147773dce5e396deea158c15d8b49f962512. 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/f2cffd90-7ff4-4775-9e15-2b13abf6c3db.json and https://artists.proofprofile.net/proofs/artist/f2cffd90-7ff4-4775-9e15-2b13abf6c3db.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 0x432ddef4fb784a3390656326424f1b465616dd9d6183960fff60ac89ee6d30da. 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/US4CL9910263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8165ca40b9c8aa1a844d81d0e01398a1b108335f42c978458eacba80c4d5c26. 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/US4CL9910264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7865915ae331c7e2bcd40b77530c7373d7d98dd22467560c366dea01752a823. 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/US4CL9910265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa167fbabf03bbcf6f90b0244e3981967fdb79f69035e286521595055db253651. 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/US4CL9910266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ddf1d81d1a74cd0848d8f003c1fa041cea666e7bced9713c43ad957af167ba1. 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/US4CL9910268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1466cf2e071ef9ce7f5108cb4d3809818755c1bf828b788d7e2707daddea150. 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/US4CL9910269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9def730f108dfcfe1e90fc2caed6decb53e635c7dbc4148e991fca191181e483. 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/US4CL9910270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b248d638c5a3c3d6020fc330ea5f5c8d8ca5ecdee0c76c22e94e1b91e1512f4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US4CL9910271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c55ecabe0907b0d236bb2341da61fec3fe61e53126034f4a00594906505008. 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/US4CL9910272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312698bfbcc632b76704d8352d35e20ea56eacec7922619be08382af43a6ba60. 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/US4CL9910273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fef40516435ccf661de088e47ed42ecb10b554b8a9f293dcc27275a1c24ba04. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/US4CL9910274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe819bfff86a357ec6544bb0899312507615c9a02521969830829ed0a72aa3a51. 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/US4CL9910275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5caf386b7234b0c1f3651921d883db1b6e4fe56ed99c509583cbe58d9e0d8350. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USHDH1400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fea6e548e41fb8bbb8546afff109ba7849965791db128aecd8bf7be5e3f560d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMKKH1400083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a0153edf7e3fb70d738d84e3c46d42586b25c9cf776edca731f04c3c2cbb1e. 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/QMKKH1300009.