Walter Levin
type: MusicGroup
genre: chamber music
description: Walter Levin (December 6, 1924 – August 4, 2017) was the founder, first violinist, and guiding spirit of the LaSalle Quartet (active 1947–1987), which was known for its championing of contemporary com
popularity: 5
followers: 36
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf9233778cf9904f05a69c459fb5c8052928343ae9601a734b086f0d43fa14956
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954055
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954055
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/44579858-aca0-4a24-b166-438878a37131.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/44579858-aca0-4a24-b166-438878a37131.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/44579858-aca0-4a24-b166-438878a37131
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T05:51:24Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xf9233778cf9904f05a69c459fb5c8052928343ae9601a734b086f0d43fa14956","name":"Walter Levin","registered_at":"2026-06-16T13:23:40Z","symbol":"NIM1065229","token_address":"0xa97801d30248f2833e5b280962bd6ba06cb6da41","type":"artist","uuid":"44579858-aca0-4a24-b166-438878a37131"}
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 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
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9233778cf9904f05a69c459fb5c8052928343ae9601a734b086f0d43fa14956. Chain 2 (Bitcoin): anchored in block 954055 (2026-06-17T05:51:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/44579858-aca0-4a24-b166-438878a37131.json and https://artists.proofprofile.net/proofs/artist/44579858-aca0-4a24-b166-438878a37131.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T05:51:24Z
  text: {"copyright_id":"0xf9233778cf9904f05a69c459fb5c8052928343ae9601a734b086f0d43fa14956","name":"Walter Levin","registered_at":"2026-06-16T13:23:40Z","symbol":"NIM1065229","token_address":"0xa97801d30248f2833e5b280962bd6ba06cb6da41","type":"artist","uuid":"44579858-aca0-4a24-b166-438878a37131"}
album: Debussy: String Quartet In G Minor, Op. 10 / Ravel: String Quartet In F Major
  type: MusicAlbum
  date published: 1992-01-01
album: Brahms: String Quartets Op. 51 Nos. 1&2; String Quartet No. 3, Op. 67 / Wolf: String Quartet In D Minor "Entbehren Sollst Du, Entbehren"
  type: MusicAlbum
  date published: 1992-01-01
album: Brahms: String Quartets Op. 51 Nos. 1&2; String Quartet No. 3, Op. 67 / Wolf: String Quartet In D Minor "Entbehren Sollst Du, Entbehren"
  type: MusicAlbum
  date published: 1992-01-01