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 0x5c0535152016ce2ce61d90209886dfe5400ae441b8fcd6c19a0b48b19fee8572. 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/1410f10c-1a09-4e80-b4a8-d208734d3583.json and https://artists.proofprofile.net/proofs/artist/1410f10c-1a09-4e80-b4a8-d208734d3583.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 0xa4fd7ac545a8c7b6b4354ec269c1ddcc3aec97758165a718f78d2dfc6c5fbcb5. 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/QZK6L2089400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2566521fabd150e795d167f88599407d15b8b19e4a4656ef1b4c2cb2097fd6e. 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/QZHN32039996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c17a44f8e42117121052a076ada9d5d380b7c88de724f58fd3ba3e925ac608f. 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/AUBEC2474823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe776701e8d061da842336f7f1076e8da9c5a630a743b98ff74ad4d651493b5a8. 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/AUBEC2436039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2425d160c9c4b51204d6d18f3c7c06371600180791c9cde60b7c08b0d89235e. 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/QZK6M2496358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11cbe6a74e32801cb2ab9067dd4ab07df9b244cbb86671c5d22660cc138ed82d. 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/AUBEC2422054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc408ade15b599c603b5948ef4303ed96eef47b9fccf3e2743909f2cd4cb615f5. 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/QZHN62250010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef5883ea2608f6d45dc1adca3d4f76fdb67357d153c3f84d8dc5b592b5579f9. 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/QZDA82260184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0557aaad03d0aab94d4b74560ace5fd5a79065564527aef56bf48c2bc4469b60. 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/QZHN72190971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8767ec0b1d557c562901ff13d1bb0e0a2ab3ce79dc134075476a9bc6b13b5a2. 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/QZHN92089553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c755083e79200e25e96147995c35b0b93d3350e6e4b8672c95e3e71ef03cc0. 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/QZDA42024159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46038e1c3a2e0e878eb0e2ac8c355ff29c4eececf7c0eb1165b650118dab3fd9. 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/QZFZ22022474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6dd6fb84128424b618f6bffbaff923ec99870a7838056e0eeeb441fc23f135. 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/QZFYX2010492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b01512a92e5e2e5c346142d4a9f5b4e5accfd8da2d3ea96ff2e24facdd1be9e. 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/QZK6Q1950812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc39a3449dbe75616285931fd02c75945ed259644a3a199101d9758b29cd86fbf. 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/QZHN41979636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c5689981df3d90202f3b405d888b1fd49bd5b2be1cb81ef4578c0b4504be65. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZFZ31932274.