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 0xe1028373fedc39f4e6fca49093831a2a7b12f93a8e2d0170d4866b37ce62caa0. 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/4dcc05b8-6688-48d6-b229-f5dba110069c.json and https://artists.proofprofile.net/proofs/artist/4dcc05b8-6688-48d6-b229-f5dba110069c.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 0xe47bd7ed139b3b45c634f61584dec5c1116b33d15edbcdb352357b6279a5c6ec. 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/QZNWT2204941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09865eaf6090786d5ccc9d878e16ad572377ca2a0b30efd4aaf0195380b54562. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNWT2204942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21a5cadc962279e0e2cebfb2ddeaf3eb07b4fd0564a61bbf0c0c1813212efa7. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/QZNWT2204943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60af0dc0a293ee81d4497d43ec82943ef0ac8acc3b52898ae09ceb4b8f017e84. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/QZNWT2204944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da04ed810ca944be4f0478a25f07ec8544e3fcf10d75da862d2a2b22fc7d9ec. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZMEP2356586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d54b93664a30a0bc88623bcfdd15c24bd27b94c64cb7a7b0fe035cfcb4d6cf. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZMEP2356587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42168958c68bb80baa38da03b8fe4dc7c20558aa82cd386f6c3f25a1f21dc512. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GBJX32366959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a6315b817ded39da7156d2c6f00f3efa4abb74c578e3c4cb1b03272b4dc14b. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZFZ62471353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8c9a00351e37cfbd764aa5d0672d3487c2340f3a2650931eb8e02407a1305f. 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/DEH742421965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bb0765da910c9e2fd442abe9d14f7ee9143a6305c04466ee6f060017bcbfe3. 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/NLE802400246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e347906458ea48f66dc9984be91396018f6c1bfd191cf21888853ef14152bc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEH742427727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e113f699acfe89c4d50f828956ef3a4a45e99a11d41bb0029c7d105636d9c8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZWFM2491954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0983b2448c8833ffcc77cbc8b681b40b7c4aa1c60bcb727a3478aafe7c546126. 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/NL8RL2500200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bb0765da910c9e2fd442abe9d14f7ee9143a6305c04466ee6f060017bcbfe3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLE802400246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455c712e230c853e818025cf7107e162263acc9fd663b613e71ce4e439ecb14d. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/IETLY2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a9c7a2ecda692c652d4ca4e0c82c2622e469afda4888d322c4b6f82610f3f2. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/NLE802400023.