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 0x08e79db51cb80d47f29440ec6d8bd931cf6c74a11f0e15762fb27d48339d1eb8. 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/5004a5e1-6572-48d0-bf51-8251f77a24bf.json and https://artists.proofprofile.net/proofs/artist/5004a5e1-6572-48d0-bf51-8251f77a24bf.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 0x72e78a690d1b44fe0c11f512ae594b97876c1d392e7d0453da150f841e5e301a. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/FR9W11901195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb75c2ec1202dda0c8047e5a3105e4df9c47e1c4caf92047af04703d3f755bf. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR9W11907815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb631ecdf4ab87a268fb2c8481efabac0f4a3d06ca8a67ed5a2962f67cd899214. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/FR9W12235451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996b5cec1106cc94908b90ebc43bf8bc0cc0895389b06f12fbb813691c256d35. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FR9W12235437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d3ca4b4066d6a4c9217441cdf37abb8c13b5bd6e71f305b66c8e2a415f2561. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/FR9W12235438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721d750a5dfe7b82eaa073899e4d600bb6435710aa4142933a4cdef9efd7f9de. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/FR9W12235440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20593d424d0acdd7c487437f4b90458ab5a53b33939f3433f7c6ba598bad46da. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/FR9W12235441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd42cfb1c5ad7dc216102fd0220d7e1605e2a948fa9e33ace3b9edcad57b5d0e. 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/FR9W12235442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af40d663a3cc08473620843c1a167616770c8029d55e7555fd85cdb275e3585. 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/FR9W12244986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc05210077ccd8d34e1e46fe26a13c0fd623ddacf36ccabfaf2a7991195eed94. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/FR9W12244991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c5c9aebcad7407b10703ece33bdcc58dba71f37bae90a938d6804f047e151d. 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/FR9W12244988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84dc2b5ff64d98e94097b95b310e70c07238fcdca9fa2bcbfe1be7b52432e4fb. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/FR9W12244989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb650f51a8aa4e1767f5ffa0a03b9fe5a902667b68a721cc53ba349ca0eb31db. 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/FR9W12244990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca5c7a0fe4ce5c1b9aa02ea443a795afbb28e079938074080bb07a7be77069f. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/FR8FB2302800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07def959cf3613d04a371aa29b4053217b25f2c0deb33e2bf396ce6c547828cc. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/FR9W12309626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea716059df7571412eaf8b698345a11d0593d14fcc69344161498067952f1a63. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/FR9W12309627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be568338ad360d442c61a3abf85ab61093da2598fa7175f26d2090b7883bb61. Chain 2 (Bitcoin): anchored in block 957959 (2026-07-14T05:54:20Z), 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/FR9W12309625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa963ec8ac3a14f31fc87bc218e29ea82be9bfd4ead362d89a94c243e1d0c873. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/FR9W12346481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc629a279924a8beece646bebc03e4393617e3a932b20a45de19f519992237391. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/FR9W12329628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9356c43a48e8ed29b87c06e2d8880fcfb14e04f5f2f85d8484158b6ee2179848. 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/FR9W12329630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6601c1e16694538b0eb1ef4dd6595152ec3e1ef30947af4b411f28775e231d6. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/FR9W12418676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b58421cd62b24b90af00abd22f7afd145cdca3b02702bdcb9a48a0c8311805. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/FR9W12418678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343accc0eded9890a4612b8d68c99a95bd1bb21543ac022f6dff8ecd7848ea41. 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/FR9W12418677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f83a6966d213c41ce3d86a3d3e34804a99ead393fc5a12a2937b17445bad59c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR9W12437203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea533f86f73b3341405ac767af1580ab024d3c799867c0cc2174b996a772ec4e. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/FR9W12458907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93173e28ad9e42e9987a18fbabbcfb5535894b19870adb7426b3b91d751a758. 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/FR9W12458909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c99dd71f8b18d675435706ef9aeec47ba5d626b2b3d3a92d0bba471904a622. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/FR9W12458911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc837f22d3989d4fd635e025679a830904c2661eeaaf6f54aa3420bdda1e7a861. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZTB42514560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe66521c037f39eadf9ccef62b70a3f4eb34cae03de33f75bb1116f8d2b2d6c. 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/FR91X1902300.