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 0xe49e56f143df71e690ec24ddc67d4757941030cab4e1764187ef200214c7f1ab. 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/18dcfd4c-388e-4787-b14e-6bb683fffe30.json and https://artists.proofprofile.net/proofs/artist/18dcfd4c-388e-4787-b14e-6bb683fffe30.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 0x75713e35baee7fa50df02f5dd75a9b3886466439749a22a5333c1447fa517bcc. 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/QZMEP2574143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582ad5ad019983b10401d324d590ed9228325159ef50ab59af9fc8c4eb078635. 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/QZMEP2574146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff7d775ee4476d16a7a73dd0afe64660f53024a5aa885243ca85ee71c1e2b71. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZMEP2574147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff550556333819063947caf0fd39b47eac35e6f3ab0c0b6f3169c5add63bc49f. 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/QZMEP2574150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8904df02fbb03d255443d1529c4e016f7e60743d398dce1c803b3e0d58057204. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZMEQ2575442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6814338672f0c83486e82742e72d754ccdb3281f42f85c64a850cb07cb1befb1. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZNWV2560145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67e28fde47e3cea23233afdedef8dfa0570123c097b57795b155cbeb99bdcb0. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/TCACK1562531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb107f9859bf28be72d2e135f812e18a74fa8166fd7d0ba233213649ec784ea0a. 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/TCACK1562533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9000c40bbba8b1ae9ffd55b6bb9dce33f9821f488e53b6b5fc0d3309b79016. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/TCACK1562539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb73c9e0ec7f0723bd83f8169fd8bff5c5fbf2e1e706a6c8f81a167bdff6c8e1. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCACK1562614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1451c1637d134f5e2378d1af9a868fd5bb84f6563b0ebefd6f51c34cc1bacb2. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/TCACK1562616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4617d7b4b04d8387b439ce91a39c40c19021d75d13c24f2af8d8648d337beaf. 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/CZA161651593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95948e8beae3cd42412eafa2ed2bf74d55a618002964f8b21e4cbc513a38836f. 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/CZA161651595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3cc3914437a571eaa8a0707332c4cf7a5b62ee00ed73a19f4e29895ed0eb57d. 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/CZA161651599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c84b33ad0a3b577bbb79492ed6785efcd81250494c664810443c4222a9b42f. Chain 2 (Bitcoin): anchored in block 957642 (2026-07-12T02:46:48Z), 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/CZA161651600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f58b2cd2807b30df77bf17009f25d327b696c33dcff7d881b24d0270ac0f7bf. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/CZP021900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810c238e6f2031006ee9515dedd718b21bc7ff9954d9cdc6bfd47c071ff66c8e. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/CZP022000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6ff916ab96811aaf9cf04c65f345b083e046a79e626638f15513dead42abd4. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/CZP022000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c472b88616fb8e6d4a87d58810cc2d9be1877313b33f75b686fc1e1a460d15. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/CZP022000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc677c263e0b0f43816d5f5a420d873cdd4f7bfa9d884e4acae95ae245223fe9e. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/CZP022000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabecfe9ffc71b80e2f9ed46bac0b00bf8f972ea74fecd2257c96e25a6c1cd231. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/CZP022000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372959b36b90b7b2c67e58324a5f1d7b5ae02e169190febff4ab0212bb92af82. 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/CZP022000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b38b884d34b52f38d66d5712b048855843c6c06609e874d1afc803fd8ee0a6. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZK6K2379337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8584ed5979a4a46d718570f4bc59e20d6ad8cb5b7000307c217dc75f427ceb81. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZMER2422917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd5bcde71fb62f009f75871d53771867d42a1c95fb15de0f7729f007fdf7ee0a. 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/QZTB82539409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644ed11b2dc817052035c6d10f5d2521e856100aa40eb6950685127e478f12a7. 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/QT3F52578793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b8f884169ed9dd414f45d399c3733eb08ad89e5de6e6966de64780f2d168cc. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QT3F52578794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d3c2edecf65825232b8487d5d18937c9c330afd40e681a106082f173079228. 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/QT3F52578795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2295665fd2271d1eb350119b4c260927b46096a33b1cf5fb4486e0f0b47797f. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QT3F52578796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc319f37176fe9a7c539799a65d8510af318f95b94ea750490197ff50dfcfdf3d. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QT3F52578797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0ba66ffaef789f0917228a8963d3dced79a8046e9f8ea989a0b0bffc35b5ec1. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QT3F52578798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e53ffc2e0d8455f6d6c7fc78165e58b53e836c434c8ef3eeef7361df503d80. 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/QT3F52578799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e30fec0ac80add1098d5736f92ae78f59c54126ade6aa3cc56222c23911f52. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QT3F52578800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e77dc8d16d00f9522aaafd2a37c2839b1696d9409f0dd506f7f7340c454aa32. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QT3F52578801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca1f130b81d75dd973b131124460604e20a3191b769c3604d7a4fdbfcf013f93. 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/QT3F52578802.