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 0x0a51cc722d5d0b7ce758ba43093f56bce14d45c2c2f31ff14ee178971c271467. 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/5e2e9e80-5e7d-45e3-b342-4d978645f30f.json and https://artists.proofprofile.net/proofs/artist/5e2e9e80-5e7d-45e3-b342-4d978645f30f.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 0xaee0c25b5d196433518a8381c1c4b13a575ccaecaa5193a7b8367a274522f70c. 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/QZHN62027531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8896e922fe4ab335f7bc7859b443b8b8402e5a04afca14077b38249a53093ca1. 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/QZHN62027532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f80609b4837d5e7bdcf02462d3d695eb739bc9b35ae83323683a5734772c32. 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/QZHN62027533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbc872c1385a33fb0b86a1ee11e12df48637262afd0750483aa5e9e54af1fd5. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZHN62027535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4378b79293de35a9a9bc75c4ff9ca5934cf8053715f187084dbbd51f3201199. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:17:00Z), 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/QZHN62027536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7089d4b3649801c2b51a8190386eb4f94280a0b3d450e7d85a2c77cf460a8862. 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/QZHN62027538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef0f599b1e548d4894fb1d2dbbe74d1c5a589720cb2c4363dff2391e981996a. 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/QZHN62027539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e0483aeb8504ccf1a43a200e76707a646098ef7164e760ee076c23f61b2be6. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZHN62027540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64be2357997a6190fba3334f717baceb63ea45cf226bc4fed7056a9dff072018. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FRX452506922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c71936cfb9cada18112744cab18802534e7941a82975528bd54af3bd71c865. 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/FRX452506923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53677b2a881f6668c4ca1522f6492055c77326d03de50f323f62f36f9d534874. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T16:00:34Z), 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/FRX452531920.