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 0xd2539301f17b6eac997f995415c2835c389081411ee2e70e8a8b8a13067e480e. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4abed860-c6dc-4ddf-a078-d92f15e8289e.json and https://artists.proofprofile.net/proofs/artist/4abed860-c6dc-4ddf-a078-d92f15e8289e.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 0xb019ed15e23918d9be47298c0c64fc7185ec1a61b9fdd49a684e3da3bda9ebe0. 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/QZNWX2341945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd338a38ec530e9339065f7d5b334a98e75a0a57053355dadd194b5f4799429dd. 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/QZHN62333106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e92ea48de477a720c248d233dcc1e7bd9f2c2b93c352f0824b268343a8a643. 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/QZRP42261523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2fcc38d5b9d4155e7a18d7e2ca9cdd2ba6a410544d330025784f9ee70cb7935. 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/QZPLR2289580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa349be340257042421db8e9bf4530542fef5a1ff67e5096e6d279666f2a96f05. 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/QZTAS2175110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf1f71f1a40c91912a55bf9c50fde147743d1dbc6521debd384fa23e09af4a1. 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/QZMER2181474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c2574129b60b6c1ae2e87b015775e9b2f73980ef5c62d55c05ca469414c07c. 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/QZMER2167982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb342e8c352cd6ce7d143e9f988060979df96ab438246f9f413dd3afb72f864c3. 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/QZK6M2118711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c4fe3a85f2b600e3b8638625e5a58c26490af2a36c714b73dd0033f9f3ce7ba. 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/QZES82024283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e831f866fe09a30f05132d2727441d3f90502202e6b4a7bcdaad28d7b46f76. 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/QZFZ72055263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e98089dd3181d5265a2143fcb5c24cb3ce7ba37d6e8fb72cad2a6f756691c9. 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/QZFZ72073040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3ef7e5d038d698cd3927c79e3ee45f0ab8cf6f05f883109883ca8e4690af4d. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZK6N1931607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960089377026f6166d373c9a33b3408650b5022a39c282691454218edfb579e4. 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/QZFYZ1925834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1e8d81ff3e97f85d7e8f3d9e7518bf064933a7415f73611a3887d565af43c6. 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/QZES81988944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47226a559a5dd7969c6800ddebe73bd11364f09c9656aa313c444fe596e8c166. 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/UST8K1848123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c4b97758e44235bd72a5a159d9054ae7b5cdb5f394feac52170cf55d5fffa6. 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/NLS6R1711374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55ad0e4ec338745a26a956c136916c670195aaf885fb25fe151536badf009e3. 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/NLS6R1701601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ad8cba1dc7f031d21bb1a56ea168e610dea572d7f78063a7a9cce1d91eea622. 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/NLS6R1701602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26249a568b5771d5fa963dd623b0433e7d51c11f50a9c6aad0072af75a110eaa. 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/SE3OH1729916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9dc8f29bba9a85d0a308cd1310c1a951c7bf3c536e644c884630cfd2424465. 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/SE3OH1729917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71cfdb3a1e73d5a9c7347b0f56c90baf1a32aab4121258ccb3bfdd43cc4ebf9e. 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/SE3OH1728748.