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 0x945c1fdcb08b54ccde1532b0c1934bb5f245fa1b55ca597b45a407a9206cbf3f. 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/44307be1-a1e8-40f4-93bb-3fc89751755e.json and https://artists.proofprofile.net/proofs/artist/44307be1-a1e8-40f4-93bb-3fc89751755e.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 0xa7524cb7ef2430830d3b6c0382efe46520e75ef61efb99a6d700b11fefddc833. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:23:23Z), 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/GBKPL1936965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2132d2b635d0cf32065f98fc068cc124e3745f5c8c6e4e3fb6245cec95c2f9. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/GBKPL1936966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e090a69202aa9399400ea6a3cb0e6c2ce720d4b7236a7873c05eee052dcc2d. 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/GBKPL1936700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcaa312467a317d24e3e2263dbb8f5a08c0fe44b5af8ea47cae6bc6374ebfd36. 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/GBKPL1933444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54d30ee9b484693b5316ce4c72abb51cd779adfeed9ada360a91f8dc272e8ff. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBKPL1936962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8f8b625f68548c614af66eb0d537d9d71a8188d25a8cabfd93ce1fa19fa7ac8. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/UKRNU2100395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f49893cd863d2350e45e44277fe9788a816097f5c434262c446705baeaf1f40. 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/UKRNU2100397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x003424962a902d337bc138e1346c25f0302ede05a8b6952f54b345c84062b420. 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/UKRNU2100399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb83fa4e323128e14da8ad462c4d83ace573d9920fcd8bb23fbd151ab8830fe. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T03:07:57Z), 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/UKRNU2100401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e4af9e6569af1875727142792368419924af4183c998f629ab155f17d6c073. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:06:40Z), 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/UKRNU2100402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82175643f3043dc62634bcc8985315db9b6deaf65ac1588bd7b6c0b5f92ff559. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:59:28Z), 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/UKRNU2100976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73827f482d3e81f9ab736bb550e3b73e8f0af18160b0b142aca1e29b9f5af234. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/UKRNU2100977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab97abaec4d884c7e122620c96836933a15780808faf2d245ed2ced0e7e7e0c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:10:03Z), 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/UKRNU2100975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae860a94b978c16ae61849fa9b8609eca517d02a5047ffbd13ace534b28d4a2. 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/UKRNU2100979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9cefb86f9d96c237aaf05cb9e2ee598bb4f97afc69cac5c594780190eceba4c. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/UKRNU2100980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc960d60903b7f1c803623ee8c5778c2e0bbcc0d7e63ce3ba085025bbd036391a. 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/UKRNU2100981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa598afbd25e126ca288feb77146d419859b8c13da49e4543b50bc2c8b6f6210b. 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/UKRNU2100982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d74e7b1803b7011f428eb407c0b30379a4ea92f65bd368208de815731cf704. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/UKRNU2100983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7add99cea0d7cb3f1ced061c298a7d15534bca406f3169e814aa0562cee40bfd. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/UKRNU2100984.