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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb58d591345958aa1aaef003c05bd5bc4a193f01ea053b8b1826a97bccc33bfb4. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7f2d8cfb-b947-41c8-a727-48f6c5ab5fae.json and https://artists.proofprofile.net/proofs/artist/7f2d8cfb-b947-41c8-a727-48f6c5ab5fae.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19cd88d05778e571e74b054b60f422dfc1a553328cf3e7f3c9374e1744d721ce. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZFZ22138496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e140ea33a18e73cf309a4d58d94ce698d71a5eebb2d3db1bbc98ec8a5ead47b. 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/QZFZ22138498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6d48cf38da715fa23ded00b8b025a75b41568dd6cfaaa4d8ede9afb2dead78. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZFZ22138499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711ecfe0690f85e314bb923db0007885b4fdfc83ae882052d75296fce92f146b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZFZ22138500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad32e83ead96b9452530adf0ac526b82a266c2e044e2a7a627b7b809da01d264. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZFZ22138495.
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 0x860ca211ef1b697372c7e1171f757443c0c3b4fc261a09f606157afd116d6db7. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZFZ22138497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff593b5299ad224de4fb004d48a8ef0abcba30cf46514fe8e24854bb24e98f2. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZFZ22138501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdfa51e5354b239b357abeffcddca4805114ccfbb32179d51b980c40519059c1. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZFZ22138502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351affa57290a507a39b2eb8f90f202bba059f70e4ef86b8ff41e25ea967f413. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZFZ22138503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e8ce16114e7e631f9d859ab202e24866f87ac61d60dc206c3d2395c2ae2f627. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZK6K2125342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fb7c9e5e6688de7d154b91a20cff30ef25a05815f15760c3d302c1b67af338. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:10:17Z), 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/QZNWW2204406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd2679577539419eb096596fb00b68d3aa8d5ade0ac7e22b6bfc987b65012ba. 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/QZMEQ2304797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40fc9cb94c4ea16a32126bb53d9401a4fde46eed4b3b448709d587d5b48daa64. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAIC2496192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d839dc00e952524be005004e299e6417f8c52befaf0e65296953f857e1316f6. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCAIC2496205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8744ec970db80ca2da5b3b8344e2afc187cc0c69583ada530153f645e71165ad. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/TCAIC2496259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0f3522e5a41c9ed7fbcd3be845d6cca5bb8478a4c6eb18875333e52c44e1ef. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T03:07:22Z), 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/SE6XX2545767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39fcf69777483555ca81ba84d1ec9c70ba75e8d370beaab937f47824643c7860. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/SE6SA2567158.