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 0xcd880ad0ea6ce44715381e9b9a8c3bbe2ddd71a88d10b1fafd9c4853ec80198b. Chain 2 (Bitcoin): anchored in block 953773 (2026-06-15T10:40:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c6f45f75-2c64-4537-91d6-c7656101567d.json and https://artists.proofprofile.net/proofs/artist/c6f45f75-2c64-4537-91d6-c7656101567d.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 0xf991fd1277a92ee689ce7364736de53639735ab3fd94e4a5cc90bff5a25052c8. 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/QZHN72470646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf641c5a28f4de166ef14672d3971a28788e63d2a6cfe511b109d9324479869d9. 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/QZTBC2318427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0aae9d08cd19104cb4d8f73b6d7d8f6a760763d446cdfb0c257c297dc6f050e. 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/QZHN72470647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15eb9b1d0cc82b5fe8e029b573325c990a815753ba5583506cefb131b9ad9f62. 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/QZTAW2304701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f083dbe856d3dbcf016e1e168bdedaf3fdf59e935e11d1e92aa57bedbf4f6ef. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZHN72470648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3807ffa7c42fa4104a56624ce6f75a82c9d1c2cceba6c3dc0efc5261b498643c. 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/QZHN72470649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cb676ccf5f92815038cd77fe5513872efa2513fe79131d26988a33b067a043a. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZHN72470650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc5a2bcaad81c164451ce284f6feae13e420d95baab448ac0f59cd0816987bc. 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/QZHN72470651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cb73b2e9a87d77fe49f46a6315910e90dbbd374bde0a4af06e44a5488958165. 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/QZHN72470652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c72c26b073f8480e3842cc770b05bc6ec0c17127139ab8f32c2719c30d3931a. 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/QZHN72470653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e20f7d41dc9a1a85c4bfb699a94442fce95917133dc8515e27d1f0ce6731ec. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZK6L2514840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06e68b927edc5f4c3b79b0b029d40752aaa1af9cdd6a839a56630c4651d6e3d. 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/QZK6L2514841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9e84a019a878b254830e54eef38a4275b143002757c572ea2251300b075389. 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/QZK6L2514842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59dd1415a532df8be89dfbe9becd57bc9d13dcab3059a36d18ae75e5acb3d21. 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/QZK6L2514843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640127515bfe391cbb916ef8f35b2d4d8ba26f92a1ec80ecc8e917650978adb3. 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/QZK6L2514844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9af24dbe8c6bb7eb4bdc780ed113d7a6a6dfd09d1eaf5ac14c45a01fc452c10. 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/QZK6L2514845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ca263d7d1105c19e66e8159d187ac4d3811c20e08dfa217c97ca1296aa6e90. 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/QZK6L2514846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1f55eb221ac48d86286e2227286e63a9e8991c8363d428f856c439c7a2e901. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZZ7Q2501982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f5c6e5aea7aa4077f0094e301452720f6f1b4fcc561d8344574f0a8730049b. 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/QZZ7Q2501983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17615a9dd335ea66614711a3194e95da7f1da920af82705618096530063f73df. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZZ7Q2501984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35ca4035c1ee3d1df6e8248f588697f02d9a34f5fe2ee9e9d9d415f98dd4295. 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/QT3EY2476717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09110dd6ecf51e63852418ffd59528a1ff70ecead7da49cff1eef4f6df95562. 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/QZMEP2473771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ef5208f064ee5f1f3bce9c8923205fe07b4b543f742e80d17275def6cede57. 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/QZMEP2473774.