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 0x1c8ffd0a6aeb90c4bee87abe61f5d066a80cba55b2abb80c62632eb4b873d2b6. 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/dd8de39e-7fa5-4488-a2eb-ce35a7e8fe33.json and https://artists.proofprofile.net/proofs/artist/dd8de39e-7fa5-4488-a2eb-ce35a7e8fe33.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 0x13b402f0daad56e16bef4f7713646b773a511eaa0b0308c1088e4009700f1bd1. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZHN62183243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594c21712f75449ce02891548f2a06b14fc2ca1cfcca1168d40d9785b9023684. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZPLS2180626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1501249757f1ede92f198078760403364c42e44759cded71ef0346a06991b9a6. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:36:54Z), 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/QZFYZ2211014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc244a8c91b0ff0c2e8b3173161fe48903746af231e7515da3c954298eec56b. 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/QZES82319946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67567bf6329426d2dd57b92ed5df2c5b93804ccaca4291f5828a9d410cef8391. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T06:32:55Z), 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/QZTBB2324805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae36a0b707805fa085b31a0b0af2ebb5e9dabd60619f3e40a49982bf3abf00b. 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/QZTBB2324808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa85e364dd77288039852776ca2790b229cfdfb1d30419a10f88e80368f05cef. 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/QZTBB2324813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ed5ac7d828ab04c6d03a322e14b578a53488eeb46f47c15fadc80bcc95e8fe. 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/QZWFK2349291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d471301a10625865dd84ceda0f22b715b2b388654a4a5072a009730a0c22b5. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:28:25Z), 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/QZWFK2349292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4bbf8c15d4c394cde343e31e8e73a83f5a2d8eab944da8420655c8308396464. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZES82406449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71530243537fe63a067551ce9e1e60b7707ccfdd08bb584e25812becc8ac9de. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T08:05:37Z), 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/QZTAY2477245.