thumb|Giedrius Kuprevičius near console of Kaunas Carillon Giedrius Antanas Kuprevičius (born April 8, 1944 in Kaunas) is a Lithuanian composer and music educator. Life Giedrius Kuprevičius graduate
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 0x58ebef3b3bf518de0d4201658cb49c0c76dbc15addd24d98a51f7f3410815605. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/890338b7-ab27-4e95-8c85-76999fd90f9a.json and https://artists.proofprofile.net/proofs/artist/890338b7-ab27-4e95-8c85-76999fd90f9a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Kuprevičius: Chamber Symphony "The Star of David": David's Lamentation
Chamber Symphony "The Star of David": David's Lamentation
Songs of Fate: Weinberg, Kuprevičius, Šerkšnytė, Jančevskis
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 0x6b6840624d34eb1b77fb205e43b41399db56454b66444c4a11dc3d5b045163eb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEB332274502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c3b24492716c0a594aa67b449bc7a6dd73391490a490cf27de82cae3e73e191. 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/DEB332274503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d72ac9f3c5f89af8bf877bc482266bcd4a8daea07095835f6f6cae8e4eca534. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEB332274504.
Chamber Symphony "The Star of David": Postlude. The Luminous Lament
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf418b765a976091fc704d387ba8c5e98b09d0fb194d53560505cef6136196ab. 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/DEB332274505.