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 0x6cf7ca62b5b0fb5be558334a9711e556646d919f2d7acfddeb8402950644000d. 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/23d1a714-3d18-4a55-9952-a2b8ad16c8a3.json and https://artists.proofprofile.net/proofs/artist/23d1a714-3d18-4a55-9952-a2b8ad16c8a3.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 0x762b57a69c1ccf86c3ee85fbb6c29f6d18dbbf884a12480d454845e4abee0ec0. 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/TCAFY2149837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d8861fb961e7002774f17b3c33d97feaae1484b103a740ec8a5cef344bc8a8. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TCAGO2210453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6560c21f1ba31f1ef2c3292fcf0e539ed15321b8747b8770fadb4ee0012196. 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/TCAGQ2245330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa3bef0f95d409f4f064a04269e1e33aaceb1f43f2a70adee8a492c9e034241. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZHN92393502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36e51ff49b11577c5eac7a1c69420c5f45adf8fb9a186fdbc62fc7c849d785e. 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/QZHN92393503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead5d651675741cc62590725179b4a13d5b94e97855f12ef685ae42db580665f. 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/QZHNA2364115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c6596a35de8e4fb7dc1bb3c90b3f01ef0444c9150878c1c10a5264299a7f756. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZHNC2359741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe239b72bda2220f061e90ed224a750f9d389399a93174969b7b328f81c9ad948. 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/QZRP42320027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb93dd87d474c685a9067c2793e0d3d28652e0334711489709655551562dee68e. 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/QZTAU2307223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c214b6e5da2731a6463d2171509ea6ee9da583217d558e3ec306b7583f32b3. 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/QZHNC2446177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c9f7ed1fc21e360f6909e6e66b91c5b617391b5726bd9ed83e43cad8e4bf3f. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/QZK6P2433452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f488b57aa8d16f02a170ed33311e59ca43831becc3f9bbbd52f506b7f7e9e33. 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/QZK6M2406916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1182d6adcad64ab9641377d7b1fdda99858cb28ac0f3d63c3243e882876493d7. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6M2406917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2f73a0874ada0fc1207e365cf3f6ea893ef5b2abc94d4c3b9f6d4f659a9394. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZNWV2489856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16de5a1ee7128b3008cf29e74e349c6baaa9827f0c2d2ee6925bdc6ded64545d. 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/QZNWV2489858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38feced0bcbe7a5115c6d2c47134fcc39f3c2e538331e3df0fd696599d70ee03. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/NOX8G2400321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45b61eb281db1bd06b9969a2ba36dc2b5edad9b20211eb0539abc38dd5e842aa. 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/QZZ7M2416551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53115e5f593a56df10ff26364e435255a015554222c32f6e6c7f556b2b0e6482. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTB32355608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62c3e58df78e045210ae3e9dd5b4dbeb34f0e81d390f8b4d5906a4f8c6857b2. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZTB32269722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7048f387a0d627a4bf484dbafad8c974457d2425b12fe127f4e44dd56b4f579. 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/QZES92325224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c1a47fc4938ac19170953a3e354997e9073b9ea8fc1262ee4eafdcf1d486a6. 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/NOX8G2301260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6dad7df08ec35526950d8ba8f8e4318a73a26fdb19701365bf6d6e09d03c04d. 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/QZHNA2315085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b53a5b307fefc8edd67d6fa1fb263d32cd812d9e37d56f3001a5c8691e3d14. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHN82302004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958c330e04040c42c4813799e75968a9d51dd8731a4d81255acb7d0c561a16ec. 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/NOX8G2300041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45b61eb281db1bd06b9969a2ba36dc2b5edad9b20211eb0539abc38dd5e842aa. 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/QZZ7M2416551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83bac98c12d6f89a7e7ef7572cfd534928e1b85566bf3fa248fb0ed09ef3b70e. 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/NOX8G2302047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90dbde8ede49b39c1149940a6d814a2e3938b550009e14ed8e4c361d16fcb989. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NO2DY2300673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d3a470411b4690797a09dac0cfeca719d3815c3024978817d5ac3b65612fa9. 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/NO2DY2300676.