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 0xbb5d4097a8655e1a40dbe6029887eef83c8cdcae1f1527dc72b5bef4fb964493. 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/953cd3be-2688-42df-a8a2-fa6c3a6cfbac.json and https://artists.proofprofile.net/proofs/artist/953cd3be-2688-42df-a8a2-fa6c3a6cfbac.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 0x56fbc39b6430304482d2e5239e32d34192b1d1ad59b6665808e18788b9a82f43. 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/QZHN52227990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda14a99ec59b1afe59444f446b4552424d86014f1f63b513c943aa81a44241a2. 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/QZMER2081408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749446288b8ae31fea73bc20fcfe3d288136a2de4e7be279799d540e0a2f6fbe. 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/QZHN52227992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1d4c61780c7dd355e587ca930dfb3b257cf65b43fa32b205c19c8ce6a5b812. 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/QZHN52227993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a33e12bcc1c05b7a77991491224fe35a5e382bcca0191d7ee76c5240211d927. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:47:26Z), 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/QZHN52227994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2156640ed710011c9a06f800ef19716d91be817559fce4437e58fb7b12fca5b6. 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/QZHN52227995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074a018cae2a24b6b655aa761fffe01c361cbdfa4d35e05f1744e11d0f619e5c. 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/QZHN52227996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b07270f8e45d64fa907ff14e6c7434d5628f076c3dbe1b6361055c5c14c875c. 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/QZHN52227997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ebb572bdd61ec46d5c73ebe9c244a3710943374221958be99492975f97117c. 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/QZFZ42162509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda14a99ec59b1afe59444f446b4552424d86014f1f63b513c943aa81a44241a2. 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/QZMER2081408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517ed3f96c7deba88f8e4a2b18b0fa2f6b19137ae6b8c6d04cce7fbbd57dc122. 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/QZFYZ1939156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9e0cc90575005051cfcf4d835a402fc5dd00d137e5d9076a06efe5f63141bf. 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/QZFYZ1939157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6423dbdea58a5bbcb28f953fac4d228bc80fa8977853eee88d637197f76155e9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCACH1580317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22108fcc15059d039e67485260a1217b78a19327627365df3fca502baaacf98c. 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/QZHN81931875.