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 0x24a5f55b62eec9708e2ea2ff67dd75a4c1ead834d0312d359227fcc4719218db. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ee111dcb-bf54-434c-a31d-60aadac43d12.json and https://artists.proofprofile.net/proofs/artist/ee111dcb-bf54-434c-a31d-60aadac43d12.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 0x9c46a4601b9370956a9e1237d22c8b2b85fb61b6295cc27dc1ac76e6edd51014. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/SE5752433624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e8a56f6dde3389a2fa92ac6136914a8b34a24021bf0c4cd6be05c71374cf6b. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/SE5752433625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b806ff763aacc7a307cd7876cc5147960a1ade144beadd43a36248a334985ba. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SE5752433626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2224f1c959d216b34f4fe015ba9108ff1df98883c89d6846ca1f3255f1e541f8. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/SE5752433627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ace1f11ada703f91b0c663af562208b648415e294ceadef8da5a92b9eb905c3. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/SE5752433628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83170c2419122470281414c594f90b901d3cbc8f0d5662b162e6212c3ed4b571. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/SE5752433629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e294384df0ea8b8d7db9383bd4780d0bad3c1567fe760900b5713453d748e4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SE5752410065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c648b280ad99fe36f1f0a807e5cc100c932fc6bc35c15626227cebf5a4ae8c4. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/SE5752411770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41ffe566a0e8b1433ad915551b3822112ae9611a70af744d30d5baa176bc01d. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/SE5752410036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c8d82d8bec25ba5bed1e9bcf2fc2562c1f4597967ceb7723687dded2fd6b0d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/SE5752410047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6aabed6f838373c0751b0c5507b823b26fc4b43af5f2d5a57d07e9f91c8b251. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/SE5752410066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0cafb2842b087974c93903f863226174654d55e7959bf08b0bcbd40c309c5d4. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/SE5752407761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e7218b4c615a5463e9d800132a3adf5060b8cf951f45979ead84a9923bd217. 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/SE5752407545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41130e63d563bf8cecd0ce5bf04e669b5bf4ea087d853ee8342e4f06eed19a80. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/SE5752407336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120b0899f8fa210380fe7ccaa536ad2df86ef622588767aca05d72c7661c8a6d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SE5BU2473991.