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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e02f50b4192078c2dd51d83332567d477da6ad71e9f6bcb057edade89bdb85a. 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/9fadee48-f5b9-4f55-8b4a-aecfa6fe8175.json and https://artists.proofprofile.net/proofs/artist/9fadee48-f5b9-4f55-8b4a-aecfa6fe8175.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42912b646fafdfb870d1a3c912a2de26ac6ff3fe60c7647da8137a0c7f308e3a. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/GBLV61802530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab125348d0a664f960706a43b2d819749359b98a1909190ab9e3cb56e805e0d. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/GBKQU1904942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3117d5c8e8d1287a8af802c6d9a49842713cf7aa984d052e2237ea9e9a74cc45. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/NLT2H2000246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633b79b80153ed70dcb5b162e0d63e38ab1cf8bc145c409a06d4738d165c5022. 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/IT2VK2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959968f6ecbee785a9530b6d09e8d63888ad9a8c5b2c92221826288ad5aae1e1. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NLT2H2000447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20a5a9b68f5dfc8b3f644854bc4ce7e0c7b55fb45a69f8c8d2e4b8a3557ab54. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NLT2H2000448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7ee2a281ce4c57faa0910c0fa643a588c4f40c83c9309f494361f79b599af3. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/NLT2H2100094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff36a6d3815d28dc4b1d1858a903560fe1f3ab52b60a34de785af5d229cfaddb. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NLT2H2100198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4858dbab0c2981cc0f1c752524991032a57b880eeb83b5599ea9fe87735868. 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/FR1A92101402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc80cf438712573c6367e23ee67a7f1d285d287da999a5c9042bf7619d117f941. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/FXQ892300239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2525f7995eac01b36bc5ef911e043bd2baffcc32526dea9af7ed6b8500388a. 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/FXQ892300240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4e00b11d9201e2b51d466ff768a8264ec7ee11e4e298b7573571436b72e11d. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/DEH742325926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cac62dda023d6c234d7d9940491ffe00651eabd5d59b9e4a1e2f0811303a977. 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/NLT2H2400353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1526d3b5411de36300b5472d17bd913937eb1acdef63b1ddba1239fae847af7. 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/NLT2H2401326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd1ad7654c4ac44e3d188052f8abb2caac0835b1e163920638c57d88c3d88cd. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/US3DF2518047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf758cdc33303265e5d293a062d376d98130dbbdd05953c49a49aec74aa00f227. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T10:59:03Z), 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/US83Z2526795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd1ace6a1b5bb7286e01c6d54e5bb464b0fd6d8906a24982cfb8498a27c1f8c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:23:26Z), 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/US83Z2539646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7786bc1acd564e38696d0a68591abb52a7cf185b5f5a0f1cbea3a08bc0d5a7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-21T08:55:28Z), 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/US83Z2539829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963e3e37682a95c82e138d86a93eec81cdfc3e5ef85fae6ddbdc43e35915467f. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:11:36Z), 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/QZZ762560859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x530487f3f52a9f94ee2b02b0416d6cb8e8d7e0b819024d96c45bb72fbe99cf85. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/IT2VK2500103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff4a07f3917754c651b3afa618a93b3afefec07becd047fe146ff59c5c5a124. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:04:10Z), 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/US83Z2554178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4653d4eeaf95d997b25f29f8cd7a021f471f9e2d3673e1a401d5e0510636ebcb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/IT2VK2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99cdedba3accb92fe030f3cc961123550264934b0447b24737ede8d7ad9e8944. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMANG2209288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d533fa53617287bf1524af91dc4de55ade73bf42b8a9b4e1eeb7b5055b59256. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/UKACT2060570.
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