John Koch
type: MusicGroup
description: John Koch (August 18, 1909 — April 19, 1978), (pronounced "KŌK") was an American painter and teacher, and an important figure in 20th century Realism. He is best known for his light-filled paintings o
popularity: 8
followers: 27
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x67d41c3d67e1bffed8638e1473d83adf4c7c7f131fc6ff4c901d09b59bf64fde
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/78487ff9-21de-407c-930f-9ed7d71fe6c9.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/78487ff9-21de-407c-930f-9ed7d71fe6c9.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/78487ff9-21de-407c-930f-9ed7d71fe6c9
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x67d41c3d67e1bffed8638e1473d83adf4c7c7f131fc6ff4c901d09b59bf64fde","name":"John Koch","registered_at":"2026-06-17T07:31:49Z","symbol":"NIM1324878","token_address":"0x5030240ba45aa27d05dd5e6ebd3a8aa068ce8c2e","type":"artist","uuid":"78487ff9-21de-407c-930f-9ed7d71fe6c9"}
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 0x67d41c3d67e1bffed8638e1473d83adf4c7c7f131fc6ff4c901d09b59bf64fde. 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/78487ff9-21de-407c-930f-9ed7d71fe6c9.json and https://artists.proofprofile.net/proofs/artist/78487ff9-21de-407c-930f-9ed7d71fe6c9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0x67d41c3d67e1bffed8638e1473d83adf4c7c7f131fc6ff4c901d09b59bf64fde","name":"John Koch","registered_at":"2026-06-17T07:31:49Z","symbol":"NIM1324878","token_address":"0x5030240ba45aa27d05dd5e6ebd3a8aa068ce8c2e","type":"artist","uuid":"78487ff9-21de-407c-930f-9ed7d71fe6c9"}
album: Trapped in Church
  type: MusicAlbum
  date published: 2022-04-08