Samuel Lutzker
type: MusicGroup
genre: chamber music
genre: classical piano
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subject of: OpenTimestamps Proof of Existence
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track: Violin Sonata in D Minor: Andante
  type: MusicRecording
  duration: PT4M57S
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  by artist: Mathilde Kralik von Meyrswalden
  by artist: Oliver Triendl
  by artist: Korbinian Altenberger
  by artist: Samuel Lutzker
  in album: Mathilde Kralik von Meyerswalden: Piano Trio / Violin Sonata/ Nonet
    type: MusicAlbum
    date published: 2024-09-06
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    value: 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
  subject of: OpenTimestamps Proof of Existence
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    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b40e8150808a966b89e826ac84408449d6cc41d8bdec8e92cae052717e3924. 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/DEAD62307806.
    date published: 2026-06-13T15:41:10Z
  audio: Violin Sonata in D Minor: Andante
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