Sebastian Holecek (born 27 March 1964) is an Austrian operatic baritone. He has been part of the ensemble of the Vienna Volksoper since 2006. Leben und Werk Born in Vienna, Holecek is the son of th
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 0xc3d9750fae44b11f3b53cd1830a0524ee2ec3756ce26824e649e0b007c9abbea. Chain 2 (Bitcoin): anchored in block 953959 (2026-06-16T14:51:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27aaf31b-3ed2-4064-8e97-1d7990914a3a.json and https://artists.proofprofile.net/proofs/artist/27aaf31b-3ed2-4064-8e97-1d7990914a3a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Die Fledermaus: Act III: Hi, hi … da bin ich ja eh richtig … Mein Kopf! (Frank)
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 0x644532759e11c6543212de5ababcbb3130517ade294859991a37b102d8355441. 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/DEB261300089.
Die Fledermaus: Act III: Spiel' ich die Unschuld vom Lande (Adele, Ida, Frank)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9feb7524afb82a292e2d21508556fd2674c5befb95994bd70108370e299042a1. 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/DEB261300090.
Die Fledermaus: Act II: Finale: Herr Chevalier, ich grusse Sie (Eisenstein, Frank)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5654ad78ab6c174601fb61da71c6076b2dbacb735ca0c5745faa2505e003e68. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:43:06Z), 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/DEB261300084.
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
Die Fledermaus: Act I: Finale: Trinke, Liebchen, trinke schnell (Rosalinde, Alfred, Frank)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ee3695f74cecb69f9908047e9e14572ddf1c2ec8d8a8740851a21424ddfa5db. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEB261300077.
Die Fledermaus: Act II: Finale: Genug damit, genug! (Orlofsky, Eisenstein, Adele, Rosalinde, Frank, Falke, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85c688b78e7b89cde5cacbeb4acc2d295a3c62da2669526c926a14703488618. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/DEB261300087.