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 0xac140fe1d4d9deb76687e2c94dbaf22212ace6b9b8690339fbc0a2c1f404aa05. 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/f1f18993-1155-4694-85be-bbefedf0a7f8.json and https://artists.proofprofile.net/proofs/artist/f1f18993-1155-4694-85be-bbefedf0a7f8.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 0x3eb3b03792e6bbc11265826896c72e06f32ebac77f4904e11d9e8d62dabd0b9d. 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/QZN882230148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02fbe2d42bb61de082f70929e4218036d4325d5ec4c27ddaefffdffb910c8edf. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QZMEP2207762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af33730f35c6ec114de3f7cc8e51a7a84cb025cbfbc2f6309a7d621450b1571. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/QZMEP2272719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93848942905fc9940ce408fb2db6abf1da415c4d70eb5cd36c2262188aa4206. 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/QZMEQ2228507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15c2ba0c62642a05bb5b989bfe622220310431c4234c2de460d8d6da8019f8b. Chain 2 (Bitcoin): anchored in block 958731 (2026-07-19T12:35:36Z), 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/QZNWR2290679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19032cc9a6ec37f7caa5c87b8015845b033f8e62346bed6388cc20091a7a1bd. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZES72372132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec3a59058d1ee1b6ec7e0435a4ea56bf979094cd558221a2c35e0c0b603b33aa. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZNJV2324233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1198ff76fa7eb21e9baddf873a1bd07e90d72f8e9300f8a0e1e623d44f3d5feb. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZTVM2213790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b19c0ad90f0381ad80c0ec9dcd64fb28dac18efe47e3ff18627285f7d0dc546. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTVM2213791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb865ceb13eca74d34ed559f2813443e9fabec0a8fc2c9eae442109931b05585f. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZTVM2213792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe685a24335948d1b81fac5a59e39265e5c3f72dd70e3ca3f0b50f1746deb722e. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZTVM2348956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a1b9664bce189ff340f46f790c48cb7fc343525b2e5820e86ac2cb1838f290. 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/QZTB52378144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ea7ddc4e77472ade9b56c77f097db0c1cf3b8836449bc707bba1d25730319f. 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/ES75E2306711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213b912e61daa85502a4223dfcabc51cf9d873a7f6f9bdd8b3bb286755af1cb6. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZTPX2414094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bdb53716fa0cb0af2b4454443fe4a9d19a2f31e70feed13d0f49878d11a685f. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/QZTPX2471482.