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 0xda0cf8c837f2524942f4546777d5f2bf7e2065ae95dc4b242238b5d68551427b. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/582dd695-16c9-4e1e-8c35-71c7dc78f4f1.json and https://artists.proofprofile.net/proofs/artist/582dd695-16c9-4e1e-8c35-71c7dc78f4f1.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 0x5840d5d9378c952ab4fee9429340b07d28177e1bd683eb37a9f70295ecd7f657. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NZYB01800067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5840d5d9378c952ab4fee9429340b07d28177e1bd683eb37a9f70295ecd7f657. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NZYB01800067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9b2e68375449e894a41e67d7b5bb8145ba62a1bc8664cb85c4a9f0c8630f6a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NZYB01800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533ca6ae043594b488d939babaa4d81815a66237620d418a98fd031a9d45d6c9. 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/NZYB01800068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f8706720dbe6b5abacd7222705fe0da5c3245ae39a4ed254d59e66e8e220e2. 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/NZYB01800069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0499d0584b6d965b6d6b87f9cf3c7e78bb26e5b1d224f000115464b29d65697. 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/NZYB01800070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b4e5401b9c73fa4ea5d960152826023160795c2226eb7c1da26495cc5fc871. 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/NZYB01800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77bc1c89a9bea85f88b43c7f65483d1c5c5a58749815c52b0b317a29ca55690c. 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/NZYB01800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab8c0818d8cd7bc275c524af4d7444fbc0c28bb4b66607d7caf56d8e51f82c9. 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/NZYB01800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b208e3bb61093d5b36a5d225667edd18226ea66fc8dfec8c6f8088cf77722bc. 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/NZYB01800071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b08fccd7d93a88a847b63f3a9e05e29eca5fd112fc12981995f785ea5ac790. 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/NZYB01800072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2221f760e2a10cd74a5b9a06a8ec5771682aeac2a98954ff4cf4613ea327535. Chain 2 (Bitcoin): anchored in block 957198 (2026-07-08T15:54:54Z), 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/NZRI11302126.