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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b548cbbbcc4cd41e42e3183e0ce3d38f733087f066eeef49c5094ee7c50053. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef3c9577-61d8-4679-b57f-8f7ac7fc5829.json and https://artists.proofprofile.net/proofs/artist/ef3c9577-61d8-4679-b57f-8f7ac7fc5829.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8034833367dadaba07bcc108270b02785a17ae151330bfca5ad5066181d286. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/GBWWA2200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda509d3fd66567c63a0bca0ff7d2171a0a6bebc6a08f2e86a8d7aba6855e6c7. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/GBJX32230045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb432e33b08bc2db76207397aaa7cfa14e67674e03832ce2781786d92c847d0ef. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:47:08Z), 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/GBJX32230046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984450f4bd1ea3f6d8bbf960dd043c2f18a05ce04ee8f9bc7596e594b28f8f76. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T21:37:16Z), 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/GBJX32230047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb115f2caabf872f33db5e06f48faa10735fbec97a24e896b8de5f49c8af3630d. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/GBJX32230048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f516150654de01a3e454185c67de79d835973c923bd2848238b473bc79e0ae7. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NLCK42226524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b251b2ba2d625488d899f5fb8f753e3e10194c1e4b51f135829298f510ef32e. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NLCK42226525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9fc35a8dbad02ef98b2d27ecef665633ff9ea790f5285173882d7514a864b26. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLCK42226526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfaa0ca515d97d5096ac58c82b3295a90d91840621d644b76e13de5372a4dc44. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLCK42226529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623c3ce6ae29aa547e64623af0ee27f30fc28cc42c125022faef48390bfff232. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:57:44Z), 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/GBKQU2430971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73890e0c5008b7142e7da54763a9178e232431ec5e9f6aa46f2abda35258067. 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/FRDX62201980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f50352666b35794c6e081822379e5b670c88c914e044326d7713d899a7d84b. 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/FRDX62201990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2cbee7008cf44c3f80985a5e9c016014a48f1edbd21c181234a7756c8a0e9b4. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QM6MZ2424102.
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