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 0x9488c210a8f126ca8f07a575b54c75e103f8e059314c62a6fe528c49c38dc58f. 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/6781516c-fd77-49d7-a2ac-814d630faba5.json and https://artists.proofprofile.net/proofs/artist/6781516c-fd77-49d7-a2ac-814d630faba5.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 0xb67f34e5a613ad732de614d40b868e52025d52dc954e0646c2af9747ff2fdaed. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/USCGH1137879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27541d3cc5deeaf9e5523348d20ed91a1b9b569a5b9ebf876f7229b99b161441. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:13:32Z), 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/USCGH1137880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe95747dd11485ec19c7fea903a55ba41c3dfcdd7cacb3831f4510d6047ff3b. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USCGH1137882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae5bf6ae32a71fc047e0a0886f63fab92e0da444387b7d9e47f2bab58c00296b. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USCGH1137884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e7ccf36ced24a4995b76293c79a49bbb1ab1c550b6dea9039098754c1288465. 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/USCGH1137885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x779ecf101d4d66e21100cb8e5043bb0ca1b6bdcbb05b72e39b191dddb0ee42b4. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/USCGH1137886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9023e13656b1079cf95b4041bd465583a84713e70a1ffdb85a0931b56e1ebc29. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/USCGH1137887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71cf50d83d347cf476507d59b5037d9eb976c2ed0538d2d9b5baa3f344ac0dd9. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/USCGH1137888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f4c65c2655e95ae9af3524c615b9c1be11ee83ab26ce69d7171d1090e72937. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USCGH1137893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b5e958fea2051929683156a1760fb7747fe59333490a9bec569946b1bba01d4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USCGH1137895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e850ad43e8f33df5f31338cae7a171ad7af7b389976cdeb3461bc735630b2f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USCGH1137896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975b1bf1f46f774c08b85c7430fc9614a7d95f4a6e2cf1c105b49f258d0f3b76. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USCGH1137898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc44b22a29d709095d158b1605551549e364540151397fb88d923f5656f71592. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/USCGH1137899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee6aa195a773886b533f52909a43eb7fc61d3e55767f50bb5bfd33e471cdbdd0. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/USCGH1137900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f1d35afda4905f752d9e8afa0ee16b2529a720a1a15409a80628cc47dc178f. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USCGH1137903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e543fb1b89fde79d0ca5d2438f37c3fe9b4747dd8a5d1a7cd214be08db2030. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USCGH1137904.