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 0xdf0cd3c259f8ccc893319b48775b4a371f2eda994d40be1fdaaf514e3a99c553. 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/aaf7bf1d-215a-4941-b558-39e7abe86439.json and https://artists.proofprofile.net/proofs/artist/aaf7bf1d-215a-4941-b558-39e7abe86439.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 0x1d8c3e1c6d0b97c4bfc150b1557db0d285956f7c757f12f50c465a94dbc616e1. 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/QZFYX2247018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x777513bd872ca9e088e30fd189b2b76240bd26a2e45d3a8e2fee9ce96d344c68. 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/QZDA82349099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9012f1b5decafa5226104b5f07891af871d0018bb7a84b9420a3136782abb0. 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/QZHN72358791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07dd3a07918c235672ba28fb334b82b5e1b2f224e9f46187eabb47a3f296343b. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZHN32513798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5caa0f1d0752d572e0a8c7d9df74cb09fc5dc2e2a29d452663c88bb6457edf6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHN62572869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b3960fb6b3ac3913f6c6544abbeae1c03de3063a1dbd7e2065db3d82fdaa3b. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZHN62575438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2151d4c0a980cee2c365c124ba20d3dacaacb9e30786956fee879e234961b77f. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZMEQ2525664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeecbfc154e903bd64f1bb9422212e359bf7169a85bbfcb0aab06354d0c143a8. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZZ7W2513252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9eedefc02995b60cf655bc83fe186e224d6aa18ce3f185e707667079c13818e. 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/QZHN52302902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa18ddaa658c23857ef7470c8883f3f886d50e585bcc193240b9e72085e55f38. 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/QZES52213609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec6b2d313a821c061ce7527b818d468c0c386e9bed9ad6849038e8dc7cd7c67. 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/QZMEQ2266628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f1dc6fcf1838deb06645f5371327db7b6e752e2bc9de17bd5d466c877d0e82. 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/QZDA82242693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee268152f2f6fffe54132d645fb35441d3225ae14b6293cf686998fd1146f910. 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/QZFYY2278770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b07588494cb7022f89da232df5960dce8db8980e917c8b80dfecaad82f5eec. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTAU2241427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccfacda4b8799055af2a98cfc32bb2aed2337674f66a0b49981b4569b6cfb1c3. 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/QZMEQ2393560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29edfb57acb7810e1ffca194e53e3f3dd56e4412f806427bb18ef81881dc4d38. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:47:54Z), 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/QZS662236648.