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 0x98526d11201c5b11c03a81173f45b94fa544d8184a01e84a2347c0f1aeed13fc. 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/c209eee0-c262-4638-88c7-8315f085c3fb.json and https://artists.proofprofile.net/proofs/artist/c209eee0-c262-4638-88c7-8315f085c3fb.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 0x08a2261a869c13811ee634f098a231ee34264f1bc647f871fad54eb1772d4734. 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/CACWV1829952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcacccecf23426e175fe675cb7dec95b0c8afdd2fcedaf7b87affd1af3e1c559b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLPM11826845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487d574c177879fac41e305f71ac48fc5f66769bde7a19015ee2bd4186a5ede4. 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/QZES81813215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74293743ec901b29f8a4a01fa7e5ca71985559edda51fa76abebd04c9db44005. 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/QZDA81946339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4359fa522ff3a7d1904b79027f7fc82dc9ae7d254092b7045afd2a4ccd58b3c. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZDA51959238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0792e12adc64d2a34da822555d5d07a216074399d75d1d3d5c5dda0dae01d76. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZDA81946341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487d574c177879fac41e305f71ac48fc5f66769bde7a19015ee2bd4186a5ede4. 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/QZES81813215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72151e9acdf7c9b45ce48965d19a7f049ca4d5c7a43abc3eade5ee7d54926ed9. 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/QZDA81946342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03deb8563a57d52e4c0bc10fbe130e8286b97cd58133606ea12ff982c8eb863a. 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/QZFYW1935292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d544e802b0a9f1ef4caa74f630ce62a6836e94dc2b42c4a8eb1a5be4e076ff5. 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/QZFYZ1900029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44cfd1f2d98f90f68ecc8ad3294b17cbdbeedbdb6a81cdd350f852ba2b93b566. 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/QZFZ21929084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0515833a6ee2e05c3f7c86fd1a745ead7b5c882b45a90490b32e08816bb03217. 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/QZHN71951864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0515833a6ee2e05c3f7c86fd1a745ead7b5c882b45a90490b32e08816bb03217. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZHN71951864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e71e32762c1cb56d53fad1f2f74fde8cfe4e6f9d857ff4fb82c48d64ee84caa. 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/QZHNB2044677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e2be70ad7ab6e619d98afe7e750010588f3d3531ebcce2a70ff075a28b4c98. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZFZ32122500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5209eb212eca89be577540e95fbdebe7cca862f9e0ffa3e315e4bf3f859bbcf5. 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/QZNWZ2124043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b62b80f8ae1f774e823ab7c7bc5bd449207130cbd366dbd30db7a5f049c1dc. 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/NLMA22200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe74d002d68231d7054e6ef635f0603d3c86e2000eec5ed809fa6088521505d. 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/QZTAS2238825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc188e9a5bb79628f7f9c049895dc4e48712339fdfc77c3a4434aa24bd7242ec. 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/QZES62449317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976ba04603105726740bb4e18ab8d594e482ff271f300891aef89a3709c68687. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/QZK6L2458628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78cefddd754383bec9c7f55151c710d9c16e17d46dbc97632de7049b174b1d8c. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZWFX2441639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc353cf1cd96416c3cf853f39a32a566e0111cd56a114014eee51dcb53b0370. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT3EZ2400545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x168b2e8978f8e9b52570e96a545aa930e6939f0dcdf96d4ab74a97a86456de98. 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/QZFZ62528605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af475191649842f3a4cb286bc042a96df7468ffd676e7b6de7372caec69afd0. 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/NLAM42100113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c0fc21f7bcdbee532bf028fc0be54068c95e5a5f00efefa0e74432866d82dc. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/QZFZ62026920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79863035d8031da40c0837713f97a2ee92ee851e6de7b30792854f596d0f3f33. 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/NL5MF2101049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3743732b7616eafe8cd1d4a4e4de6b89f49a9e58664ac6266989d5b502a91203. 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/NL8RL2504861.