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 0x4ccf7a5be5ca765e35e434089e50d94492d66e08c8aff05741b32bf69b467b1d. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/71acd09a-2e7f-4901-adf2-19a9cafab0ed.json and https://artists.proofprofile.net/proofs/artist/71acd09a-2e7f-4901-adf2-19a9cafab0ed.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 0x75cf564ba3efc3fd0c8cf07a9e83270fd99eb3dda2ccfeaec257954d9e472580. 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/QZFZ22399645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc50147c0b7a70c99cd8a3b330d9427402714c46294d342aebd54dc8a27ad3e5b. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZTB62353844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e127c31d582994aada82410c0fa994c8c8f13390f75b7bb09f132efdf954f8. 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/QZWFL2367656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72cfe1f463285f9d27e6b62861b09b3145e0ca9ed97766dd86272f813b1afc37. 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/QZHN52417277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2260a61cebeb2f52427978ba92bbc7ee3f893f549ff492a31d299f0c6fff72. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZHN52417278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe0ddb0833026b940481213bec9181f43918f54f46db953c0d24f668fe10ec5. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZK6M2410594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53951b982b1954a76afdea55bfb3690f59c7aebfff079e5cd6f3a24e4bc67b2b. 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/QZK6L2426070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b1dd97e523db7e116effdb4cef87006e01e1fc48d86530e55983cdac30926f. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTAU2441213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c02072cab22cdd79dc542e05801b7b13758f93b25cfbe0b3d69d25d2f1a365e. 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/QZFYZ2529536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2f90e58929a739bd58e4656a968046e9a22676f77e2264a6ebeb52bf263ecb. 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/QZFZ62502730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1162c9aa3777f04ffcbdacf93c3a711e7645f6da6cb2c48697a420ebf53eac5f. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/QZK6F2554291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535748fe88173d71b35e200443f08aa26efa75499614beb6eceb04ba33f702d4. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZTBF2519830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002e0bd7cd0b39bb7496b25dc66d4eb87fb20ec984acd8e2b100cd515cf71d72. 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/QZTBF2520113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3405e64f54b09c0d0d7249fbf9c19da8c9dd66a20a7f45676479e85cddf70c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7M2584011.