thumb|right|Vincas Kudirka thumb|Litas coin issued to commemorate Vincas Kudirka Vincas Kudirka (; – ) was a Lithuanian poet and physician, and the author of both the music and lyrics of the Lithuan
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 0x799b8c8f511a78dc7cb20bff805f3e79996713f6bd7f041aa4bf334729c11981. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/22311439-e50c-4786-a9f3-40cc9f715fc4.json and https://artists.proofprofile.net/proofs/artist/22311439-e50c-4786-a9f3-40cc9f715fc4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lithuania [Tautiska Giesme (National Song), "Lithuania, land of heroes…"]
Hymnen Europas - Die Nationalhymnen der 25 EU-Mitgliedsstaaten
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 0x3c84a2cc7dd0a1c8799f3be1302f843cb852ad6d181cfdbab01ffd3acb228cdd. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HKI190507510.