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 0x68779dbd713f54f0d5c33938aba5086352146b419443a5ac059d5297adb715f1. 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/1b6d0091-fb92-42c7-8c55-2cc0f8d57d83.json and https://artists.proofprofile.net/proofs/artist/1b6d0091-fb92-42c7-8c55-2cc0f8d57d83.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 0x461b9a67bf250aea9444c3f816d90d446c3b4052b1266c808e156da091552980. 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/QZHN72370641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x421b27ddde953c72ac1ad3f8bb53044abb1bae3dfd7257529f23b8889594e09c. 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/QZK6J2380892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e44d5f250cd1291526cf9df82d94556a50399cf5c246099b353bd46fd056d6. 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/QZNWW2308226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9bb4a0b9db90b8c0019a6ad46bf4f5db55db5be172127e64bff330ad271fe7e. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZNWW2308227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d38514986a490b74d1e2c9c08e7fd0da6a0a8ea07d5069720f87307ebd91bd. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QZTBD2319226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1db48f3e5693300170112a8c37d39d0d6f76513903e66a83ecaec6d2d48ea6. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZFZ32445241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5fe1a6e358c8bad480508c64d16ef64227ce1bdf70954dc103a84b9088abdeb. 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/QZDA42436017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503003b49006f0170562b617191c9ade865223b4945810bdf967511f3bfd5123. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:50:34Z), 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/QZHN72457317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe662720217dcfe9b457cf28802ed7bb9e5a202337a4aebff6a04a6e5ec5c6ed1. 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/QZHN72457319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcedbbe7ce005b800a0962c9df6e479979adcc7d563a65fa43ad4b05822e068d. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:35:05Z), 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/QZMEM2443554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa3fdc7860fc4ea97a52b1589b1d9d498a3101b143032970540f710ac3f316dd. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTB92469735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c266f6652d289e16f9627a96c7723457af066fcc258dc041bc96d3243ae22c. 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/QZTB92469736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb929003d884fec6cc5a160eececa05129ae8e233e489d103a0692932150d32a3. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T10:49:05Z), 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/QZTB92469739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdb9df8a913f7e2c92ce737b284637c53054df43c4a949f537b2fcaed3a8abc. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTB92469740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524d038fe84264525464da6bce316d631fdb4eb48998390794981e4e3fe9540c. 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/QZTB92469741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1408edeac0fd6c2061a868922b7de7cbe8e7b47ecfb121613f5cde927e42d247. 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/QZTB92469737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa750321ef6cd7ec1926db3bafe24b7ddc362c5887a18b51c0989dd4ba54ef555. 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/QT3EY2413742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59bd94a462f5b67d22dc4a558c5134bb3e5b6b94e5022b7ceeace10d9520f064. 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/QT3EY2413743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15e8cb1e421276c6fe8cedcad39db39de5b9867859b023105a082f50561771d. 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/QT3EY2413744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda32699dece28caca51af46c65201cdff5bdf503864c1434ed024c4833072e4. 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/QT3EY2413745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0bf93e1280d40dd9f089fd82ef63724c0136bb9e54c7732f0cf3dd15c0872c. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QT3EY2413746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d05f5aee333fe2e1569e7783d2d1235de05d4c0f90ebe3d723cf09a51872258. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T21:37:50Z), 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/QT3EY2413747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a083cce93fc9aecf9bc4d6622f34d4bbe81b458f31ab664c5112a41095bf53. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T13:08:14Z), 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/QZES82581308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1113510e7688ee55adf09b631ec491425cd99752f7bbf7df3832f004384dc4c0. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZHN82588266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324f831ab70e49731cd35a4ae6c37205a0edc8204eb76458973451a12a665263. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZTB72522770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe409608a42ce31f1100810cda43beb4f4576b2ecf9f141044f65318c68c743fa. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/USLD91781040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9865b3312f995b8cb033b2c7efd5cb642818f01b50b51c1b867ae577e620a949. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZQAY2424965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb67f7eefa8117aea73136ea9a960c98e4522d4c3b468fb9d3eb52be20a89014a. 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/QZQAY2371050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7956f5514660bea0d7a4a8f4a608cc552e680e033ec2d8236de1f4904e3d3968. 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/QZQAY2314953.