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 0x5b2741f1fe240b3b93fdc1bbc6db03f113d42894a8dd74a0985cdd610f0e3baa. 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/44aa4dd2-4411-4c86-a2e4-64f6f6c2caf3.json and https://artists.proofprofile.net/proofs/artist/44aa4dd2-4411-4c86-a2e4-64f6f6c2caf3.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 0x7237f0ebc8563f1bef073ad5978cdbc5352d866ead33ab6a9807abfca295093d. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/US3DF2420043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bbbefc41341ea36f53c25234dd524a172564b30d62f3499ddb43fdffcc2ab19. 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/USANG2430328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79dec11ae4c2459b8a8759cca747c68994f23e432d17f38e9ad4d5bbafd0bd7c. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/USANG2441826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cfede198a361da606e3e4cc9ea44437bc58d522d5d6671d73a8172ba5b80593. 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/USANG2471807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f18ce595d0abccf0f5bc8c50a3c6d7e8d0db403fe7f2c5960b9a7f604262ef3. 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/USANG2498233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe628c506d1158740d2058fa837cf42740c17ba5faa5f133ec1162a47fdbf1074. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/UKZGC2410553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf17040ea18369018525a8c03f98c5443303269d7fbbd27b9c5f8ffecc0eb387. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/US3DF2514970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda60204cd9f510af323bacf21e1617c14123f9db548af17501ef04f55797876. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/US3DF2562402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02fd2ae362c432e46f039bdd1c7e61d2f3b10b1201826a34b419b273294717a6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US3DF2581055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f92b53bf1664992fd9f5a91ba9de326d3f32af24a83daba8197d7553e199846. 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/US3DF2585466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4527e08dd16b0c978045b91bfb1c7d7950c48382afa5be6a1fe55428383eb1b. 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/USANG2527903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0deaf8fb51026cd88937471ae44b62a697f75fed95afff81ebddea8d9ff48a. 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/UKZGC2508274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7868ff8717ee919656760519cd30af93c7e948bc83ecd3ec3e599ca1e448aac8. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USANG2432183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7868ff8717ee919656760519cd30af93c7e948bc83ecd3ec3e599ca1e448aac8. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USANG2432183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79dec11ae4c2459b8a8759cca747c68994f23e432d17f38e9ad4d5bbafd0bd7c. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USANG2441826.