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 0xdbd0243ecefdb7864ef71779ed646d411fdbddf7b19e6f57fda19821a28eff66. 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/e8289d02-3ed3-4497-a9a0-b557389a1946.json and https://artists.proofprofile.net/proofs/artist/e8289d02-3ed3-4497-a9a0-b557389a1946.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 0xe72dfb351363ee99b15a963d9a93f1c49b36a9a709cb1498b61531582f20d7a1. 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/NLD681302584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e89b11f0e988f08db284855beba51340d8db26a61fcb4d3c8761762c945e7c. 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/NLD681302591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd486c908ea1ebbfc6374a2773ab961f49c68183317bca9626fa2152703c711d. 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/NLD681302593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72ba2b70bc1b864ca0236ec411bef9bb5b4338f393210f0eff968a83b194d8f. 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/NLD681302595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5ec55da1cf23b0f4ea38f357bae7dc34ba6107373a4868d6ace6c007a1f207. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:45:32Z), 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/NLD681302597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf39da36d17547afd6d0da21f4b19b0c0e0ea69dc3c9740c4da5886adeb9027. 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/USHM21760892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a0f9d8bf6bd54a475677e56e24612c69b72af2a9e38ed449ed42805bebcd06. 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/USHM21760897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd10651bfbe8ff47df57847f415f702832538b9c7fdd9a3b5b76b7d8da5c4bc. 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/USHM21760899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc85759db7bedc255efbe68543c86eca69fabee433f232c2924773bad374e71. 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/USHM21760901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b6794292141fa291cc47fe153ff957482ae89bd021ff23e58f889b2c77f093. 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/USCGH1733028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b64eb642c04a3a9f78e54de6badfe12493e7486b9101c4b6bd6f5ea10e5a2c. 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/USCGH1733030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7237ca6d18c71d726deb3a6bd833979220b1fe8e27da7075b7d1bd90e5f46e9d. 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/USCGH1733034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e179aeadc9966ea97d134254b0a429fd444bb4089838c5174537e31260e88e. 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/USCGH1733035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda038dd323b2182565fc27d5d46425e08d23b10d641072e45f57f43d859904b0. 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/USCGH1733038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4768c624633963e114fb2542b1286d0cd2ae644f70be79f5d6f5cbf419c0191c. 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/USCGH1733039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7f9e5dbb2bae459505c25c293d22b820018a6dd3f391116facedd29dea8f2a. 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/USCGH1736327.