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 0x0f707fee71ba397b2648cef3da28b7c35c7add6051922c3dce2f03d8e57f9f60. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/06d6af9f-22cc-4ceb-8ed0-600c28cc6d06.json and https://artists.proofprofile.net/proofs/artist/06d6af9f-22cc-4ceb-8ed0-600c28cc6d06.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 0x62afd39cd63e1988f2615688acc713e2c8d49ef3442a82d8da79bc63b3328ac1. 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/TCABN1340744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca25e17e680d741c3a5f55fe3c374ee13087082dd324d0c97cd49abbe0441ea. 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/TCABN1340747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1eb5dd13aee110e6049dd2fae71ba5842040dae040f77ad487e4aff89906b35. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/TCABB1188949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c65ea0a17b315448afaa6a17a8f1960c27c5dcfbdcc31bfb2700027e8f70317. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/TCABW1466036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2133957607ef4a2f13ae33277667e4d107181f2a095284951fc4ead1ecbb0d3. 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/TCAEA1825108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008f72e9df9b194e3e3f62f93dee9ac280c6525817e88da1fd720acf89d21570. 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/TCAEA1825109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707e9671eb04d67b30b8fed3083f7307537c26134679bbe00a130f3b7e92dc30. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCAAY1192729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ecd1fd604f140d206d2604ee9b7dc4a75f5bf4396165fb5aeeb048aa310ff61. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/TCABB1188950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cbc64fca191ca8924cb0011c0f4a6d2ae6cd6be7b05fd2819af8ba0128b5b08. 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/TCABH1217635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba1cc7fbdb114fa84d1db1da41ec0f5da56b4a5c83a23e0b1ad6af013a3a27b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCABH1217636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa4903c927231631ae98052ad33dfe335fd0fe9770aa04cb5d7bcd87630507e. 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/TCAEA1825122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9f45068151dc467a819b28ff4df2e0fdcf103e7100adf8a6f67849ea76727e. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/TCABN1340746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98c3a9427aa5dd6168e77b986bd47ac14df6ef1abb84195679544863884313e. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/TCACD1528156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x504d5c78cea2b32ea147be4b22743deb3b7fc2aaa38afc84b1950d7d7158aa4a. 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/TCABP1381067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6a96d4a86bb8eef3622cece6468f5f1a39565d22d706c46c56b45ef64c41e2. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/TCABB1188951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2444d8d5829009f70132a79960586ca53eba954c1cda086912a1779d3d64255. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/TCAEA1825189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f736469afb192c7fe51b07297ac62756524ca8eda3c4b66005a0a028fc3d230. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TCAEA1825190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76c6c81f0c9807f9207a9e711ad4591d0441f2272eda255acc0ca54450fa8cf7. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TCABH1217637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ade49102bf03de1ebd24402baa91c3d7793736d441741b3d29b82f734c162f. 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/TCAAY1192727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419945da3ae400d92aed4c70bb440ed6e48c193517d0857ebb964e7f849beb35. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/TCAEA1815173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d80e560fbd795e855916c149dc41f5b379ace51e250d4f916d067f53950edb4. 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/TCACF1575933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c48373245d1b038b106bc4b10b874db0a1ac57008dc648b99cd6246f4f70dc5. 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/TCAEA1819071.