Milan Zelenka (born 4 June 1939) is a Czech guitarist, composer and music arranger. Music career Zelenka was born in Czechoslovakia and studied guitar at the Prague Conservatory with Štěpán Urban. Wh
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 0xcaf592a8ed520e5ae5b5786aae45c175c7ea588e72814e18165f40ebb2a48119. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df028558-77f1-4a1c-b77d-e70040b71e0a.json and https://artists.proofprofile.net/proofs/artist/df028558-77f1-4a1c-b77d-e70040b71e0a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Václav Kučera, Karel Reiner, Manuel de Falla, Štěpán Lucký
Concerto for Guitar, Strings and B.c. in C Major: I. Allegro
Vivaldi: Concerto for Guitar in D and in C - Concerto for Mandolin in E Major and RV 425
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 0x7d83239624f645a39b5423a48fbf49c421152e654021bf58611ae7a0913440ff. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USSJ10812921.