Ivan Kusnjer (born 10 November 1951) is a Czech baritone opera singer.ND a jeho předchůdci Vladimír Procházka - 1988 "KUSNJER Ivan * 10. 11. 1951 Rokycany. Zpévák. Po maturité na Stfední prúmyslové s
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 0x8af83ee3d8cebe46beda15d6c0c71c5e1e453666eee2d85a193cdd0b8f7ed652. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1cb515c8-0912-4a27-9884-aa3c4f0339d7.json and https://artists.proofprofile.net/proofs/artist/1cb515c8-0912-4a27-9884-aa3c4f0339d7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dvorák: Svatební košile (The Spectre's Bride), Op. 69, B. 135
Mozart, Mascagni, Leoncavallo, Tchaikovsky & Bizet: Arias
Le nozze di Figaro, K. 492: Voi, che sapete (Cherubio)
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 0xdcac19fb1070f8824def9327c78fea08006ab2035ba7758be0e5b5458c6e105a. 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/CZA160202050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4e4786093b15ef590ec4d6de6c162fc9f7051fb443219f6b2d7ac12dcbb92a. 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/HKI199283001.