Gary Karr
type: MusicGroup
description: Gary Michael Karr (November 20, 1941 – July 16, 2025) was an American classical double bass virtuoso and academic teacher. In the 1960s he pioneered the use of the double bass as a solo instrument an
popularity: 2
followers: 128
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf79f15e869dc91c609114391aa6250cf9b508c3c64545ffc348e878295c8f4da
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954066
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954066
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/6838f076-e3e7-4df1-b581-8f3be33b1019.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/6838f076-e3e7-4df1-b581-8f3be33b1019.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/6838f076-e3e7-4df1-b581-8f3be33b1019
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xf79f15e869dc91c609114391aa6250cf9b508c3c64545ffc348e878295c8f4da","name":"Gary Karr","registered_at":"2026-06-17T02:18:32Z","symbol":"NIM1250108","token_address":"0x6f937a1a2c30c5d54c253abd692ed2cea7b03d16","type":"artist","uuid":"6838f076-e3e7-4df1-b581-8f3be33b1019"}
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 0xf79f15e869dc91c609114391aa6250cf9b508c3c64545ffc348e878295c8f4da. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6838f076-e3e7-4df1-b581-8f3be33b1019.json and https://artists.proofprofile.net/proofs/artist/6838f076-e3e7-4df1-b581-8f3be33b1019.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0xf79f15e869dc91c609114391aa6250cf9b508c3c64545ffc348e878295c8f4da","name":"Gary Karr","registered_at":"2026-06-17T02:18:32Z","symbol":"NIM1250108","token_address":"0x6f937a1a2c30c5d54c253abd692ed2cea7b03d16","type":"artist","uuid":"6838f076-e3e7-4df1-b581-8f3be33b1019"}
album: Double Bass Concertos
  type: MusicAlbum
  date published: 1995-01-01