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 0xd058c7e65f1ac9f66ef712af8af0b100764e6611d2178b1e1ebc9f2d82f1e9f9. 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/2cb0ac93-f162-42c0-92eb-9287bf8626c9.json and https://artists.proofprofile.net/proofs/artist/2cb0ac93-f162-42c0-92eb-9287bf8626c9.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 0x372b944d177b153e728b39917164f1c8b8c1f390c0ab7f9736c9b6679447fcc7. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZK6L2329146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0514c7d8ec7cc9b04ffa65903ba019281dcc425639ec6158eddc1b18f4396fc. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZZ782436157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed11b693ae77312827290c9f5fbabf0cadc25d4e8b1d823760114157baf50f45. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZZ782472464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4746a0181921897917c72ea0abe387fb5610073bac5b4a098d8a5d8c12725fdc. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZZ782469655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963cf2660d49020cadcba81d0b7bf4474f06d4bb3a439140f9a1493d47854be3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZZ782474933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf24b7072de53a22abc1cd35f777b29ad31d878ef6551bae38c6bf7cf4864f82. 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/QZZ7L2498028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f5d9a34ae0e4b7c8a119fa6aab87cd15d7b14f677aba915723abb5ea05ba84. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZZ7M2478619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4904f576ce1de8f89eac6f43d4546c76328cfd90ad1f50763188e45a0a36b2e. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZZ7N2445873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441778b5ffe6f54606d862e4689f6d58482b8ec757b2a9c1b405d37adeefb35c. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZZ7S2426596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf627258cc96a467a7f25673222dcfbd8ee200b714441806fe9a3911a5c920d32. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZZ7W2402761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f2210b888ad2454456aa404fb6866101d358f0fa6fe7f51326a24cc29ccf201. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QT3F32414770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb897f6b0e41b1d9b605556d48758b197688b3c2ae6797dc3d57bbe75ae4989c7. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QT3F32414780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4230de1baf5f01427601961c421aa9efa7587b815397daba6f2deb9b8ef1aaa. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZFYX2582260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a66f4260d9a1c5b7b7fdd8720506237ebb1df45873940de1e61b93d45f8afdd. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFYX2594470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e677bfff252db78fa985a34d5e505fffea9bb68f81c8b65559dd19856ced1fe. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZFYX2596337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99db70d458d2ccf258fd01c2b2219308cfe561cbd1cc5d234dd9e67bd3edb17. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/QZFYZ2533806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531d72896a9833f66bc03bff23f17662168bcb3ca6d5feddcc138a5bdba12940. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZFZ62503441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd665e739c10bea94b35629c45e42272be3ea08b5053fb08157534a31bed2202c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFZ72598831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444c1f8def4db1e0b9226be7133b817a48e6ae76e463bbb0ea807830730ebee3. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZDA72573409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e30c60d76fce4339c18f01338ffdf33077fed01d91b6c9806974459ec10741c. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZDA72599485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe744b3e6e038072bbd6945d0704a251bad6eaf2426add287b6cea688736c05. 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/QZES92599667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed3e0bc2d701bb76d263bb036d8effd08582f7c3bd4ae13f671f1bc324c3c2e. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZHN52581604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e6b7c271f5a932777d070fc4e804d453c7b16a4947405daeecc19208da2af9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6N2574211.