Louis Kaufman
type: MusicGroup
genre: chamber music
description: Louis Kaufman (May 10, 1905 – February 9, 1994) was an American violinist. He played on the soundtrack of as many as 500 movies and made over 100 musical recordings. He is also credited with reviving
popularity: 4
followers: 159
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0x20c299ef0a8b82bb72e20480c23a3e45e00d040086bf597f17eb67f54b81ddaa
additional property: OTSHash
additional property: OTSBitcoinBlock
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  value: 954342
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954342
additional property: OTSProofURL
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  value: https://artists.proofprofile.net/proofs/artist/8501b1e5-0e7c-4799-b376-32eef2750173.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/8501b1e5-0e7c-4799-b376-32eef2750173.json
additional property: OTSVerificationAPI
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  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/8501b1e5-0e7c-4799-b376-32eef2750173
additional property: OTSTimestamp
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  value: 2026-06-19T03:22:39Z
additional property: OTSCanonicalRecord
  type: PropertyValue
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additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c299ef0a8b82bb72e20480c23a3e45e00d040086bf597f17eb67f54b81ddaa. 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/8501b1e5-0e7c-4799-b376-32eef2750173.json and https://artists.proofprofile.net/proofs/artist/8501b1e5-0e7c-4799-b376-32eef2750173.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:22:39Z
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album: Musical Masterpiece String Orchestra play: Antonio Vivaldi: Il Cimento Dell'Armonia e Dell'Invenzione, Concerto No 3
  type: MusicAlbum
  date published: 1947
album: Musical Masterpiece String Orchestra play: Antonio Vivaldi: Il Cimento Dell'Armonia e Dell'Invenzione, Concerto No 2
  type: MusicAlbum
  date published: 1947
album: Chausson, Vivaldi & Others: Works with Violin
  type: MusicAlbum
  date published: 2021-05-21