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 0x2cf3e88b9aa9134518d1c8887d2d90377df8528a9c7dc175ffc87a3494adb667. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/792f2f41-d876-4b3d-a6d7-30605958ec49.json and https://artists.proofprofile.net/proofs/artist/792f2f41-d876-4b3d-a6d7-30605958ec49.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 0x3d0757efcf9d78870f88a7aca1c3a0a10cd52841df6f1abc205c70edcfa9715c. 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/QZZ7P2521635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9ff3269e8b8c6a9bb2a33468a04f7b55617eb69881228eae082b41a4bb8e7a. 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/QZZ7Q2515966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf7b325aa041dd444284f8e784ebdf0aced6c1c00e6ee4fbb331d2933796e81. 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/QZZ7Q2525973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf575c6e5ae47f88726452d327525c4d5fc9b28c2ef83fb3788597c0b4960019. 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/QZZ7Q2580520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d3016a7a417bff98b5743f8e4552dad240466cc74f5e71c5a996d33ca154f0. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZZ7T2568808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5f16a546d2c0557a789fb2063e9f764dd5882debf812740789b2217bd81d15. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZZ7T2568800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f2daaf4ae747e5216740fdc139c23720cef2e43080581949e585837f8d15bf. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZZ7T2567061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e87f2b380652f1525062102d0bc7066df944bc37e2a9a22653dca5269f309a0. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZZ7T2567054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac56f160bf0a1b0cdbf9b7e61f49af8d9f8502ca1b745044e0b8f512ec975c99. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZZ7T2568843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490965b45731f329d49b6f9843481d9508ee0d3d1a8d0c6193ca2ef9f6e6a7b7. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZZ7X2552234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf35078ed0daf3e6f47740e149b36fb35056a062a7b22eca5e4a47bfab5b6c5a. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZZ7X2553973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ac9c553c0bf6c857910723a9b618037862d0ad8ec8154c2c8fb70ffff0838e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7X2553982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9931e73147b5e42a2cce7b6678ad90af03ba6b95260b74245ecaeb5c0a5dc7d3. 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/QZZ7X2553978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbbbdaa61fc3eb619aafb7b81eb2e1a68a3e02cd8096afe6d91350629cb24517. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QT3EY2594798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1010602f679976169e50bde491299d1819f81b2efede765ab5accd77b683f4. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3EY2596589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250659a2e3d2c81c4ad8409da61e20bd59ee0ec6f03ea06d7901cb932c699e24. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3F52523378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7a8d0459b8319696d5d8bb11f2b4ff4f82c2e58c3785c927e7e5fcd6ae6018. 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/QT3F52525380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95aee6effaf6193630a468b0ded4256872fa8465ff83ad291c835b9c3e16200d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QT3F52525385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe378f852ce201268d564094533644c283e54ac07f764eb4c9b84b0d897c8bbab. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT3F52525394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe633291cd5670e7f1e5fa4f69440018e83880cb7224875cd12fae43f2622b667. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QT3F52525398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c78918001fe46d88049b755d21c4c2c240313a685d67f998cccb85b6be8a87. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QT3F52525396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371aa39bb1a0f4f1bc12343029995147e6fdcebd27390d9eca52035e8cb6b0e2. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT3FF2581251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e63b0ed4af71685b71130f110bcff8e53209b55fdbbc683ba613d19799158b. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QT3FF2583197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e31cf76cbb7f38c4dafb6daa3f6b41ef34e70cddb455bc41692eb68d7c85148. 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/QT3FF2583202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86414fdfe968aca647e56bac456096ff107aecef079d85994d019fe53769719. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/QT6E82552503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a560ef73b4c864666793404371fb6ebbf3a8e6b9d63fc22dad505388120b58b. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QT6E82552504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f1e1939559c78a0cde84e92bed3c070fb3ecf6186c76bf149a9df4f8670972. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT6EF2599157.