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 0xe2b182d2d31178aee41a2fb516d83a43085ed36c869c403ad2229dc91a958185. 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/e90f1bbb-b9c0-4499-b2f0-10c8c6800bb0.json and https://artists.proofprofile.net/proofs/artist/e90f1bbb-b9c0-4499-b2f0-10c8c6800bb0.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 0xa5e8584da70b04b5c6365f61ab00047da8b6c98ab4cc47cdf213d8bae28e4b9f. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NLCK42404227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f62bff24a0c0b3db0acf8deb10dd9af539df0806f41c02e907aa21c05b4b687. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FRX202467123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61f9e0406d3feb82bc99214d6978263048c2cafd9b92a57a100a006c89840a1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLCK42341280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34ea2d9822aaea4237e88b5b7fffa2b310374c78c1beac4802cef5293ad4c34. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLCK42341281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61f9e0406d3feb82bc99214d6978263048c2cafd9b92a57a100a006c89840a1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLCK42341280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34ea2d9822aaea4237e88b5b7fffa2b310374c78c1beac4802cef5293ad4c34. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLCK42341281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6336f71b8c37eb91a2e2505cff857ef5de71d3a26ef021af00168c8d15e1b62f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLCK42341282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a045a893ac695bfee149586c86c17308ca632c98bb4066efe766c17cd2f0a7e. 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/NLCK42341283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d4c5e34d260395a5370796013d7fa751653991c1b4d77d6091a3ec1bd9cc0a. 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/GB2LD2320209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10b45960fd93266ed429871faa1414dc4ce0fbbbbae13de091f292db552b0a21. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NLCK42231158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7246e5f88b6b545f6260a814713f15a9a31cf279bc49fb3b36aed17dcdf85075. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/BC5A72300058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30c808da81fc2d26c9601309c4af7797b97b9d2431bb4c7b15513d506a2ac86. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLCK42220301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49bc1fdc6700f4bad16d31429ac6f801282dece41ec59f71dd064b09154b9259. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLCK42220302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343e0390032e6dc649e7193f183a5963e30b7c62c64fc7a0543349401d68e638. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/NLCK42220303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042f8faf49213dbad0d0c59f6a9ad4a3177e528db80ab1f10e86f98e0b8fbeef. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLCK42220304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52b7b3316d778e464d1672d156c481e1d0cd222a99244ce04f32db0fd4552a1. 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/GBRF52100066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0acbc62cded72ff5a9595c68d877647df636446c862ba94ebd93e0e7a7d473e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBRF52200062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a28f248aa4716376d778486e9a00df7f503808409c0353a30878ed68dbf46e. 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/GBRF52100137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a0a1bd9b0871f1457f5a7eac8aaae728fddc5c9636304bd83fe5caa4ec9463. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBRF52000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ee4c9c0610569777d320f24f73a29830d9f5e023598d2d4b55e3bdbfa768d7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBRF52100064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63846a9050c4e5c020f6b17543102abd0f7efe79882a0c7af0dc363bd293d4e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBRF52200061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde65fcd58f656773053b932f68e97d22c5e2f999002505aab1a9e8dd139036f1. 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/GBRF52000043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2c17dc4f5a8ffcbdbebf0e2fdc97934f207c501303c22670f2839ffdc02906. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBRF52000041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422d8f8aef9a964c0607d2c46030590fe7b54fcab082f04bfadf398743ef0092. 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/GBRF52100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1a2bc515743988c9e6e4ae897bd33d0066f7c8e4c7b265ab0fed276b04fa77. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/GBRF52200051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859549fb2ed2760de8dc60ab04081249d28aa50ec6f160aed1224bef9bd2e278. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBRF52200052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f17fb1ac709aca73f5271c7ab14e82b17cdd55e1cb0f8459c25ebb6f9cecd1. 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/GBRF52200053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09419a9f1888f852456d1cc4778e26776c836ac695a286ebfe589a0916624c10. 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/GBRF52000057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488421da4b2ec3d53e9db5e9993c916cc40b97338ce5fe2e5682d4e1bfb566fd. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/GBRF52200054.