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 0x58c736d51b050f11e0f63b7e58c62446d35738da9b9a2ae23722a529ab418869. 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/5e2a27b6-0936-4cf7-978f-a8a47c9905bb.json and https://artists.proofprofile.net/proofs/artist/5e2a27b6-0936-4cf7-978f-a8a47c9905bb.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 0xe1a90a10265691d52eb8468bd9d40764e0d2dad97d1530ebdce0cd7e674f1354. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNWX2161187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f64ffae06c837543e5b82d67ec38a92595521b2ea8ff76cffd9021b28d1d873. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZNWV2197921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f69f8a832225e86454daca620fa43cfa9a211c451bf028334b28c13a1fb1a6d. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZNWQ2171793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bfd90cc3c79014fb559152383a8e882c13fc685ca04d67a222e830931eeeed0. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZK6H2149498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5865959f2074006e15d3a223c979a89160f6f9bf769d73476064677aaf7a8cf. 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/QZK6H2117536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea6d220270034a4601120037c6a0d6eaf077acff577dfb0f06e4f9b337ef094. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZK6K2125813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a94566fdaf65583f52aeb085f01976ba34f1dc111c804953ed4d983f4e9b83. 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/QZHZ62176665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61ebc6b927858da8d3e6230547a771947d4410c8ae5f0f4570d677104b30d04. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BCLTX2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb221867d97d1a8fc468042e007786d6fa13f927b521c7ffd1ac883a8d19d0a24. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BCLTX2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c821aaf8468ade912e14e283cde6cfb2b1b8aa10b33ee7f9b205c9afebc473. 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/BCLTX2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5045fb87cd532f002ef7bcdd878552daf35a5001d0fd6916eefa69eddb4f2f87. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZNJV2005468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2a631e8e99926bf505899d1728648ba37538ebb0b4e4006f3f759634788d71. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZES52130854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18beedb7f53281890188f7a170015708b14a70ca3033cfcee148b56c5d1e3953. 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/QZHNB2122173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc917e49f3d18440b4a66adbe06c72eb32042b1d1cb5a3920e8380a99ec264f9f. 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/QZFYZ2283895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87feb41ec320c6a478becf059d91ea66cc856373236a76dbff9a7c39e6f2866c. 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/QZNWU2270244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9b89b993209ec74fca1cc1d3f93ce80880c07e1a4163ee9c0cb0041ded4b8c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BXIV82348353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd770c68c782e0c3b676907f3b0e532dbbbab0d618e9f239a6ae0ea65486f37a6. 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/BXIV82494373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7163d6710594830af9c0841c122c54947cd1fa4414e2d6498c4eadd11c2f64. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BXIV82433504.