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 0xe576df0183295f4a7115b30891e761048c3836fedbcc70aea13b76b62ac66e5a. 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/3d365871-1a35-403e-bfe1-02d5c8fcf9f5.json and https://artists.proofprofile.net/proofs/artist/3d365871-1a35-403e-bfe1-02d5c8fcf9f5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x9b31349d39a9706b2f61636c2de2af2e458dd7f35f0c439826fe49ac8c65e4c6. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QMFME2131654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ea56bafee2c4a0e77a7c24625f9d2c0c7d2ffa1167a9b07df452c2a83131d1. 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/QZDQH2263124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ea56bafee2c4a0e77a7c24625f9d2c0c7d2ffa1167a9b07df452c2a83131d1. 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/QZDQH2263124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f28981ec34d335b72a31d8de9cd3ba255149f41d3fe94709aac81ddd6fb6919. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/USANG2272288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3c732dcb12e045e072f6a875026f90945f8e0f053a41adbb5ec7f95a0634b0. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/BK4DA2300815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee0c8b36a887e0246d2e0d3b3003a61465d25f7b52b3492d394f53d3fea89cc1. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/BK4DA2215276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f28981ec34d335b72a31d8de9cd3ba255149f41d3fe94709aac81ddd6fb6919. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/USANG2272288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f28981ec34d335b72a31d8de9cd3ba255149f41d3fe94709aac81ddd6fb6919. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/USANG2272288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c71860bad93a30ba329ec7cdf09a374f4d4b6138f2540456596094036e7618. 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/US3DF2455204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6489211b46f0301f93ff583adaa3c498d3c3038b3c007d43661447c4dd8941a8. Chain 2 (Bitcoin): anchored in block 957838 (2026-07-13T10:04:52Z), 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/USANG2294730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5299299305191cf72552e8ecdc433e69ef72c4df835d648b1936fb04e201d243. 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/QM3DF2226185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aebace88e0027b2637594ecca387ac6be4a35d5e2e7d66f8609fd5389de9140. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QM3DF2261637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb3be6e3d7d53cd5b919dc264dfbfd627e66f69b7a70ee802469498663f0df5. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/US3DF2408291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c3cba889e11e1bb942b24e241686781e0a75d49195819f3b9759d5b9dd29f9. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/US3DF2417047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c71860bad93a30ba329ec7cdf09a374f4d4b6138f2540456596094036e7618. 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/US3DF2455204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa25f74ec34e6a5154a90104387c185278c1cdd8bfef2a39ceb1d3c4536dbbaea. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/USANG2438070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa25f74ec34e6a5154a90104387c185278c1cdd8bfef2a39ceb1d3c4536dbbaea. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USANG2438070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4619d0c8f5f733fae0b7da31f1bb923aceda8567df539d0f194b0a8e91d2a280. 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/GBLFP2356863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734e45a35d924ec63dd864f5ff2b228ebbfe0695b9b7af449bdc723d3a127937. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USCGJ2035118.