thumb|300px|Le Moustier Neanderthals (Charles R. Knight, 1920) The caveman is a stock character representative of primitive humans in the Paleolithic. The popularization of the type dates to the early
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 0x00b3b7c65619ca610b9d908bee14ba959fb694523488bc53ad1b25013ab77e10. 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/3cc4d4d1-4055-41b6-897c-a1f52250dc8d.json and https://artists.proofprofile.net/proofs/artist/3cc4d4d1-4055-41b6-897c-a1f52250dc8d.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 0x8d2f9a37aed99c7a98f39d444e13fa2a0e4916984fdb9bb950c80e3c5790e1f0. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USFP71329503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb5ce1c73541a5ba9723afc53ae0dd37d4519cca31688e94fb84a254d9fa0b4. 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/USFP71329504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2565fbf02093bb16ec0dc02e4cb068907da829ec3455af0bb6ae2afc24c257f. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USFP71329506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1befc1fd029649f9e9f1174c7ac5b77f4ca32e8483a2c4573ec8fbaa1a41ffed. 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/USFP71329507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb783ced523ad7620327fa6c9710c5dc3e0cb8a69e315c8effe88ef08c9f86348. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USFP71329509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d61826b78ec2cae4929aee6b0ede552bf36ad0f9ccd9cb41d5417b33d4fc1f. 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/QMV6U1100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04cfa071d6a0966decaff601d4d13205e6f297d03efe7a56d3fb71650a728d33. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/USFP71329502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2f9a37aed99c7a98f39d444e13fa2a0e4916984fdb9bb950c80e3c5790e1f0. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/USFP71329503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb5ce1c73541a5ba9723afc53ae0dd37d4519cca31688e94fb84a254d9fa0b4. 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/USFP71329504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3722d52e071e1f17a9872335a0ef15b9d174c2bfc80b85cf11715fa4ce05fa4. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QMKSC1600017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc04918162de406bbf0f3a55d030b1c97bbb4e408287f538c14fadb97cef6092. 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/QMKSC1600018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a187929a40cb96d4794f8953b0b2397fe10ea542ba6f726da8a238b6f7a10c1. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QMKSC1600021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f910ad0a0b3cf2d869a7af6dbd66cb0438c48e3441953850d83fed2b27c6cc. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QMKSC1600022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf981413a06b030a2fbd527917321d4d3b05db209905e99bff9b20a41910817d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USA2P2104369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9fdf60c16d51aa73cfda6f0f75bbd2b6e9a2827ac6a25203a665e1a916c630. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/GBKPL2099771.