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 0xcc61e22531cdf8649f1655fbbc927e54c2f81cd69e25e4953716a1cd19750154. 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/86a5e8ad-0efd-4638-b15f-f01858598720.json and https://artists.proofprofile.net/proofs/artist/86a5e8ad-0efd-4638-b15f-f01858598720.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 0x9aec8ed233da9c889f1204bef70b82d0898f974b4f5a0acf46515cdeb15eb82b. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T16:00:54Z), 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/CA5KR2036241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d29164fa96d6e4cad4a19b2c846b6098eae1e45fbf82e059fdbe44dac5d73e. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/CA5KR2032969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f48260860244e4993c0e6c7e8dcb76e8bb052bc81de0fb753ec3dc11d0681b. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/CA5KR2024563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba53752f2bcbbfbffc46d5d38ce000c97253d8fb461c6ee940ae9a5f55aa9b99. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/CA5KR2032966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6c0ed10e4f7e545fa590782a913b9cf5ba086caa53109270ec8cac0181ef0b. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/CA5KR2115239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86b3a8c757a6a3c4b972203bf42d3b3a52f358b2898788f4f65e600db5d4b34. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/CA5KR2121669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe09846cdee1aa00ad68e617cd577e90d781ab0673bf6a9053dc6d10d6303de39. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/CA5KR2121674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414c554335f52ca20b0a750509f8f8cdc9e8ec93c6fd18e2c996edc217ff59a7. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CA5KR2305734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd336ca4244162fc2dbf2f2246ad30dd51f9188d8aa02a7e44604dd5c11150437. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CA5KR2304736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4534ae9553e7a414782f2b050d34c6b0fa368e32dd49bc3750d0e463e2099f. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/CA5KR2427482.