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 0x336f90a12033a9e60b109bacea57b5310c3ba8b27c93419ca278d20cd25d2c87. 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/e9070b2c-5eb6-4493-bc35-fb64fc749fa1.json and https://artists.proofprofile.net/proofs/artist/e9070b2c-5eb6-4493-bc35-fb64fc749fa1.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 0xbfb30caa77e5c09d1218383dccb5d93406eb83e482dd016a8a1a3e19f8dfcf05. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/DEXC82000035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f5b22c5dff799ad5b80984e8da7c2436f6a0db963d1397820c046b79b3f56d. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QM24S2105144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71f7bfe81ca0fa3dd5affcb58d274cdb4bb77123db0661e52aafa6e39a59957. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QM24S2106442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5ec9205a26ed97c38860632760585e652cf9bf76ee8faa23cb2c703ed3cabf8. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QM24S2303868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a7e5f132a672126c1498770c145b2cb240df2fa420161ab9a313ae568715e7. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QM24S2403290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a7e5f132a672126c1498770c145b2cb240df2fa420161ab9a313ae568715e7. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QM24S2403290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4baf7555271bee945e154e97402e30c256c8f1090517ac712d91af45cb787498. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/US4HB2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a7e5f132a672126c1498770c145b2cb240df2fa420161ab9a313ae568715e7. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QM24S2403290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22fc5fa66d9f7321e6d0ade6c7d9733dad3fb3ffac95f264371a039d781c5aae. 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/US4HB2500046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a7e5f132a672126c1498770c145b2cb240df2fa420161ab9a313ae568715e7. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QM24S2403290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241a3f8a090f7b1d6cf52bff8610f3bf74adcc5650690751614b5e414eeccac3. 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/US4HB2500047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9438a67d9ab46dd62570230d523e7228e0582aeea3c388c94160e753dca7a5a8. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/US4HB2500048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd388877db4c043b86028a946d17d065fb19b2d9127ad6bb834ba06bd9e4dc86c. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/US4HB2500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57df1ef869f5c68c88b46645cce03ccd436a331aaa352f19c4e3d6db57600edb. 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/GBENL2403873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09d40dd0b616d21d5eb616a7d4506e5310b8eca7ae876eaca9f61962ade25da0. 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/QZHN72250805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b66f3dcaa65a8cb0f68babf82d8ab77c0338a3c381ac82e94510b4ae1062bf. 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/GBMVH2400960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa43dc3188316313123f766ec0c8556a29b2de28521e6bd0843de3b17dca4de9. 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/GBMVH2400980.