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 0x5012d4e166cb87a4e00055feb5f00b6a6951faad43e26b0786888c217447c16d. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/99c893c3-97ce-4c62-8d6b-9f32228e0bc2.json and https://artists.proofprofile.net/proofs/artist/99c893c3-97ce-4c62-8d6b-9f32228e0bc2.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 0xeb55a519eb2400be865f8f91107b21c5dea4cf221963061b032138685066f5cf. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USQY50976197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf88cbe9f30c9521dfecbc5a7a4da56d3acadff6db5c9240293e71a9bb796cfc. 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/USQY50976198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x870373b933f651b3ad3caf9b4171680c6244f67e6bdbea812287c48aa41ceda2. 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/USQY50976199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70dad7b97803dd04f1907bec0b24c83a0c27eb4157f9459c481f987260b33918. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USQY50976200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc55bdff02e5bf16099adcb5a031f573ad344940a5b49a6cf4a98498de26275. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/USQY50976201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf253e622c6b8f2e6d63245f91a38f1525eb7b76de98109bd0a9e7b03f33d2c3c. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USQY50976202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137b6abdaf0984d9ef71e9e1fceea71293249ab84691a11d0ebe710e4e97e1be. 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/USQY50976203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ef5f3c23b85aced9b750ce747f78de7631682ca2921789d7d5df49d9d4ccfa. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USQY50976208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c11a67cdb49a9f47232798f15f573696d31d0a53baf8dcb13da320b094ef515. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GB8KE1000406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161b0c7f02b6191f37ccffddff1c7821e209e600ee1bc697a18fc3cae3916423. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/GB8KE1000418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ae28869578c274c645f823073a7e199acf4ee30f41f8fb434ed9a2652f33d2. 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/CA1NM1210301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849e9ea09acb7676630440b1d49661cf971857569cd3f9c4ba3dbca18f0ee3f5. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/DEH262218704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2766bbe10c60431f99889516ed71ed7b3079607102840315b3b9ef7f9b0982fc. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/CAHKY2508001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7e61c77ff934b15ac43a6acf3a39c8c2b34ee0cf0d00cd9bc9d26f9cca1760. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CABD21200213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e06f43e1a74879fc8b1ff617901b0e16d5ccf59b1afe57bf15e4526aaa3dff. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/IEFVX1400059.