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 0x91451f465596a4fa23190367168c64e2d63252045a9ea4eb91cd5a68fd38f280. 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/2b4cdac5-fded-4aeb-9aa1-acb7ccc9dac8.json and https://artists.proofprofile.net/proofs/artist/2b4cdac5-fded-4aeb-9aa1-acb7ccc9dac8.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 0x6bb1da36d666a9bff1c45f5bfe76016b06399efa07b5650eb98a42a16304b969. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T10:44:48Z), 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/PT4CA2131230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25ca745080854370669146df91332c9e3c6aadff0c091c2bbcce766ab3a606b. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T23:09:21Z), 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/PT4CA2131892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89281284a58ca9e369fd60234166889ef477e3bfd1fe5f94af7626e789b67af. 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/PT4CA2230581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c648fe945f6b24e98ede60254dd3823af0cd3cd2affdfbca760801c1f0eca87. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAHZ2470119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b672b239fb1a7015b3f73b719ddc9dd9b1cee26c6def7731e97448a53c98ce. 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/TCAIL2455522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43ae472fd39be33b851a8f544f32fc46ca9ceb9ac1ec1c6f8d1e6036de15ceb. 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/QZZ8A2414232.