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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e9590e5e98737e5b105b10f87946ca7f838f21c0c5dff139c7a49c5ca77f8c3. 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/6c4cb9c4-444d-46c8-ae29-56d0f0c57bac.json and https://artists.proofprofile.net/proofs/artist/6c4cb9c4-444d-46c8-ae29-56d0f0c57bac.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5750fef177a2a2f9df8dfd3cd10985be37bf28ff72ddcce0109598b3862e01. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NOCEM0611070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463f7b122a4e294b35600d37d835e38f9ef3fc91ca3f4cccbcca57be1d1c1bde. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NOCEM0611150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4374c7930ef5b7b1bb40e79c53de51125760baf81b387acf291dcb97a9d8755. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NOCEM0610020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca2d8071d2f08b420a6672575c0fbd4316a7f4a4062d655d736b6506fcaf6347. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/NOCEM0610030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78a555df4a62f884d3d3e77f546d8534b4595926ed2266cd4debf58ee36e5c1. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/NOCEM0610060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b3b0b7e292bbb9c2c8ee85ab9a2f588aabdbe2458bd8df03619912f975f367. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NOCEM0610070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601ec0386e29f37cb6d1e254a5ceb75e56b8c2f1bc1e03930396ec8fc0bc3899. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NOCEM0610120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfef7aae5e8a31978b43c38df4b65365ca2f005fe6106b93d82201f4a6989f4c. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T02:34:22Z), 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/NOCEM0610140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e90c422c8f222ffcbe060b21cd24bae6b62e7b6217ad44586a43b94d887be6c. 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/QM6N21906099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07f50bef46787c8b8b51e906126f551786af12a85a766389d6754a4e50ace41. 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/NOCEM0505140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc848dd5db085df59315c3f8644e423a98d92c0997c566185f6fee7e1f4bbf0c9. 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/NOCEM0505031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705b9fa01e1876173c806428b749768282387eed981327bf20c70cddae0ecb09. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NOCEM0504200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d850d9a7f98676f1a4a16a1557a0ca1fa1bf23c61bce807433baa472a401d4. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NOCEM0504020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc476472dfc47874ca584fc4962c0a352a7987376ea4070cb015284b48eec37b8. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/NOCEM0611100.
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 0x742b68d0356a06050b1dedae8c2ae90739359487b94073030a51ac4e5eff61c5. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/NOCEM0505180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ff9ee72b40f801f51eeb03012be9d86a854302d954c83ae663e7065660c6a5. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/NOCEM0611090.