thumb|A man subtly smirking A smirk is an affected, ingratiating smileB. Kirkpatrick ed., Roget's Thesaurus (1996) p. 572 evoking insolence, scorn, or offensive smugness. Human ethology categorizes
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 0xdce7e4e2550f85a211a53b0287eb7f1d41c7ec5ea6aec9223dece966cb883ff9. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7bab2a0-a6db-4ca7-b41a-dd3e7d00ff78.json and https://artists.proofprofile.net/proofs/artist/d7bab2a0-a6db-4ca7-b41a-dd3e7d00ff78.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 0xbf2f3ef99baf64ef1d9b12a7d37a9eb4d67b90f61acee46de2b514e4af40916c. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USA2Z2001933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d002ae5a394b6635622de0c94fb1c6e41ddb2c8b65ca02226911d4b05916ecc. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/USA2Z2001936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985bee233b7503e6258a0046e71ef5e495110d19c1b5d4c1b10e2c801ec46039. 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/USA2Z2001939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1bd8afebc983274f41b084329f170f6aff7653f906a8e92b8b92ff50af0922f. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/USA2Z2201106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8bc7288b7dd5bd647748f62c628e2265187f7beba2588e725d1118586c66dd. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USA2Z2201107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d81143f01dbeed23d75f3baf048a7c3143ab606116fb4f2ca5e2001ba942240. 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/USA2Z2201108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dd60d1338ce37c9a604fbfb09d54692200a7936f2d7a30e17f30f59af2e7d13. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/USA2Z2201109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27029069eadba52e180b86660b6bcf9c1e0fea4fcd7245b6e20366dcfb814e57. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USA2Z2201110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9d116d036eb4bc8abb193c70945e0ff3e2aa871398be77bab01321b8d18463. 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/USA2Z2201111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2097d7b2c599d470242aaf1a35edc15ad0cc17b5c8116587523ffa4b02a035cc. 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/USA2Z2201112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559450809a9c84a50f4a3aecd073c0f4b60254f6bea94bb8d37340e2bd3e85cc. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USA2Z2201113.