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 0x54845c4768c974b12d2935b1faa309285aa899f2f24b38a30ad602d9148e5ba7. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/065f2294-e053-4214-a238-9ea20dcf96ca.json and https://artists.proofprofile.net/proofs/artist/065f2294-e053-4214-a238-9ea20dcf96ca.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 0xcefdddb86ff5d3ea4b4a6b932efaf2e1873ceb6b2270677ee190267ca511b73f. 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/AEA2Z2545106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e986f080a8008fe3620ebe1e8f76213ee92ee89627c58c03531e0785a4f482. 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/AEA2Z2545107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3b5bbc13a184f6769e4798d47578b646dddbea271bb1df44a7141776813b84. Chain 2 (Bitcoin): anchored in block 958487 (2026-07-18T03:43:59Z), 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/AEA2Z2545108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0cf2205aa2f58e47500bf9c5060245142f0ac473cb589d1b628eb28da6fc9d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/AEA2Z2545109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a76b3d2019b50c4fb62d77c5d77d23b85416bb1b90feb9e83edd49e923b3fd. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/AEA2Z2545110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df8dee3e5b296a0048e9166a4177c7f9bcd889c3798128a638037252f9b1b63. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/AEA2Z2545111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675751dfecf78d903d34f030920baf6bb1321495e4b35f11f9cb35ba3e638c7d. 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/AEA2Z2545112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d9a15f5fce42a8ba1801e49554b1dd77ef7ea486660b0c633e4544468adb62. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/AEA2Z2545113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31826db56c636ddd4169ccdf5319b7289e85b7806e7065f4a686c3d3c242c08. 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/AEA2Z2545114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4387404727475badfd7ef6fa1bcd6268020786290c334dd940acc0f9fdf691fd. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/AEA2Z2545115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d42c14a2ce588db6b0647af02ffd9fb5c5eb16c5e7903427617b798c539ebe. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/AEA2Z2545116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb92b35d6db81ac122580fe4c9598d89f03a36c4889369ee43b6027867a08c5. 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/AEA2Z2545117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277cd2b9628b2c745f4d89e3e1c79a6096f9ba1ba11b8dd21b304eed744ab7d8. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/AEA2Z2545118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f7b44c86a2fa4b65796210c20d766a9dd7cef5909b418d9d4a130fc0ed4827. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/AEA2Z2545119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e55e972dc544fc834a9c057590d424f1a5d1ef1aa3399b1bd419a4ca0bc3c59. 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/AEA2Z2545120.