Henry Grossman
type: MusicGroup
description: Henry Grossman (October 11, 1936 – November 27, 2022) was an American photographer, best known for his portraits of notable figures, in particular President John F. Kennedy and The Beatles, as well as
popularity: 3
followers: 4
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x7f539a63249b832758912e6bd1ef11a38f426599c038a3b9370b43d94bb4c424
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953991
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953991
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/2f7483c0-16e3-4e5c-b70e-2196878c9e14.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/2f7483c0-16e3-4e5c-b70e-2196878c9e14.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/2f7483c0-16e3-4e5c-b70e-2196878c9e14
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T18:47:23Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x7f539a63249b832758912e6bd1ef11a38f426599c038a3b9370b43d94bb4c424","name":"Henry Grossman","registered_at":"2026-06-16T06:04:18Z","symbol":"NIM0960383","token_address":"0x364b0684f4da60463877bbee743dea370d3d68bd","type":"artist","uuid":"2f7483c0-16e3-4e5c-b70e-2196878c9e14"}
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 0x7f539a63249b832758912e6bd1ef11a38f426599c038a3b9370b43d94bb4c424. Chain 2 (Bitcoin): anchored in block 953991 (2026-06-16T18:47:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2f7483c0-16e3-4e5c-b70e-2196878c9e14.json and https://artists.proofprofile.net/proofs/artist/2f7483c0-16e3-4e5c-b70e-2196878c9e14.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T18:47:23Z
  text: {"copyright_id":"0x7f539a63249b832758912e6bd1ef11a38f426599c038a3b9370b43d94bb4c424","name":"Henry Grossman","registered_at":"2026-06-16T06:04:18Z","symbol":"NIM0960383","token_address":"0x364b0684f4da60463877bbee743dea370d3d68bd","type":"artist","uuid":"2f7483c0-16e3-4e5c-b70e-2196878c9e14"}