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 0x8879f448e68f36456c9a610b4cf919da3c45273ed2d9d851c17ad5b228d3d3d3. 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/146a402f-4b2d-4109-ae56-7549e9cabf37.json and https://artists.proofprofile.net/proofs/artist/146a402f-4b2d-4109-ae56-7549e9cabf37.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 0x9d3c92970644b5803119cbb47f01ae2fd8e516b79bf0b12a143807360a188a26. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/FRX851901709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc049863ea15b61974f17808ff2b51d8dbfcdd7b12e80d45c03b344d4234c5689. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/FRX851801236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61f3e761138472b2c8c5d2fcb6b4ff6464e653742af923ebfebd61708e0e92b. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/FRX851801276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f0871dc9fec0f3ecc83fb7093712b8d52ffb0d4cc3e34fe3518870efd0a5f2. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/FRX851801239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73fadea9b157297206bd42802cc2fadf5abc39ad94ef948261302c42c4bf9609. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZDA42427950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5981371e519bd4f28459cdbefbe674d6822911c93ebe68ebefa84b0e9ec7279. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/FRX851901776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6038eadd7fd6734cc305f66c12233798c41bbf9c5f6dc23ddb2aa2b5cccb33. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/FRX851901713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf465a7a3041ad8e94abb98393521b23e3d29fda3333c5de7e6e4993005b513. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/FRX851901777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8cd7eac8eae3896e331dd32fa01f677541b02dedb741ff61d51f7fcc4135157. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/FRX851901778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4586478b3956e5c77263e1afbbbb6c6bef6d53fac04e5d17b19d10105ff7ad6c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FRX851901781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb91a02b6d2214355ecb51036d10982364637608e9e2975544d67a3b57a7e3a8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FRX851901782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227f924434da01c312e851e07b2fe9941247a596a910a0ba0bf88d4001331d24. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FRX851901783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99527e232e3e9fb50615c59e11c324e1b3b1d5da352dbeb36f13fe2d2281d0a. 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/QZPLR2443094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c53e3f7d69f5d55584d6b2e5946b2d13f249f18d79113f183e4643b75c4320a. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZPLR2443095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be75c7dffcf9f85bfa0779635377e7571dfa2eb69fd8104720a10235e8b13d4. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZPLR2443097.