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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 0xe164363ee4b4a81940ed3ec92817d3233b47c628a37ce24582583ec89927e8aa. 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/c4458e12-73ad-4e99-a8ba-254b4f5877ec.json and https://artists.proofprofile.net/proofs/artist/c4458e12-73ad-4e99-a8ba-254b4f5877ec.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 0x86cda842535a09bc261e51c3d50f6e4c769d9e47d1cf17efae9ac1cfdcbb78f4. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/USHM80535415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26c0defd921181b75e9f5dbe4b8cb19e3fc91fb761082a5e59408b71a10c955. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USHM80535417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71648083bba55bf8e77317eae2350e703173e5be2567106f9a06f16175160485. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/USHM81082437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9c13753821450ebec3b595b388c09951a6b04b67688703997dab96423bc52c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USCGJ1302903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b9aca55b351582167e9c3a70cd937d1e68b792a15f1f125173c6ebed9b9e83. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USCGH1878162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b53a06c78d7851222f62b0d7f868b69656fe7e1dcd62def97ee0a1ab517050d. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USCGJ1833132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce0d46cddf9982b607a5855dbc478f19be47baa70ee2df4cb033f5bd96878d1. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/USL4Q1837679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c3160943f58e27c6ece3f7833618a3601b488af0f346e08a1a8c01ae662b8dc. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USY282012735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d1e7a90ae54bfda77d3ae9d2ae9cddf64ddd108d8ba61c0a17a6e33310d110. 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/QZHN82350465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7526c82610bc71eaff76f046d939498285b8187d7b74b61aedbd0c38043d78a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZHN82350466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2251c6a5763cdd505dacd50cda69a55f4426d8c4ceab49ef0c46c52262600ce. 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/QZHN82350467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc567dfa761c499fe3cca292b51e61ac92414f111439c797945c313d62fbc5cc7. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/QZHN82350468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe199bd2184906ba9c18380367bb3ea25c0973058ea4903f484d125d013b069a0. 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/QZHN82350469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb273f36ab264164ad50bd995135ad1966fdc9ec20886049a5d53feda8a198a. 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/QZHN82350470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888dfdcc32092c30822767b30242e0b7d8e88fd849b9ad6937cd3356aaa0fef9. 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/QZHN82350471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4354a7415a69a40788a968f9b68654ffd71946f6dee29e046094405aa1b455ff. 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/QZHN82350472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d6268a77e5b47f4acb29dc1da5ff0dfa7b130f31543498ff83f72f187f393b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZHN82350473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34166c3ba31db0bbaf6a923330fe9b4557c4e3a12f8e57f7c3fef19e5f685fd. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZHN82350475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ac569f9ae21a244784dd3fe249a09c2da2fa88c306f05a61e54636ddde65bb. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZTAW2339635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d39ae82eaa3c787aafb53488c107935e139464de7a3439fdf2cfdb5e909d10c. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTBC2338402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c66a831d684ba6f93fe5feafc39319b7adbd6d9a1c8132bf20036d5d5483959. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZWFP2409054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b6a55084cad85003e01bdec12ce3d326a9208b7f8f6984de838718404f8f58. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/QZZ7V2422709.