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 0x55df15e5bb71a25fc0c09dba705cc74d25b0e27faa3f284c7c93705727036a80. 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/7bf8e311-f6c2-491d-8460-ef890d1c61fe.json and https://artists.proofprofile.net/proofs/artist/7bf8e311-f6c2-491d-8460-ef890d1c61fe.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 0xbcb207a058812a75694cac4087f440c52520e59778ef4b044ad0797502249509. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/USHM21442447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fba3523bb2d8bb046967e5942cf91ba8ff5f3919fd30196df57d7d3a52328bf. 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/USHM21442450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5d897fd4deeeb6a26ca6f70132bc36fcaeff56dc0e9ef1103455012ff9f39e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USHM21442451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00bf7befe62cf8c4d0803c1fd629554b6bd2ed74bdd19d0b419244e37e1ac46. 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/USHM21442453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c73177bcc827da71f344a1e7c79f4ed3339effd8b0ff5102d61136f5718f2fb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCACM1659779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56160ccf58312cd7db90c7b9bf938cbba18478115dcd7ca17127af3173381b75. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T01:42:04Z), 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/TCACZ1774068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12dd9e29188cf5867e4c316a6dc4d2255e3c8108a6c9af25addb40a483b9f72. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:24:41Z), 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/TCACZ1774069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7add9b3c640576beb3f5dc0fdfa3f93e09552bfae4edd6cc1138c1ce6a405fb8. 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/TCACZ1774072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc33dbca2399eb7bd0eeb2424e8385dc0dffce2801a45d39cf4fb79a165f3b3f3. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCACZ1774094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17bd1ce2dba9e7ab01a3cff7335375c7092bc9cb278b06fe49042dc074850b25. 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/TCAEU2009091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b3c4cee77231b831757e2096561ffe29ffaafab028bfb1f32fe12f9a27202d. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/TCAEW2048708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5f45afbf37b70b33a94dedb390b465b24796b4e38c0d170549d8d1a77e8016. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAFC2027981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781bfb460f489fd3a648c4e8e3bdc54438e5656f29ca39aecd25af9717e202c0. 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/QZWDD2223518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e34b79b3120cc05a0fddfa27e5eab0056b41488431700c998b1ab8432814b3. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/QZWDD2223520.