Jan Broekhuis
type: MusicGroup
description: Johannes Franciscus (Jan) Broekhuis (Amsterdam, 25 February 1901Robijns, Jozef: Algemene muziekencyclopedie. Haarlem: De Haan. Published 1979 – Lucerne, 18 March 1974De Telegraaf, 23 March 1974) was a
popularity: 5
followers: 29
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd2b746c6670e664517fe7555898a68320465d9ac426e1a04aa8072134586e7dd
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953997
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953997
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/210b0fdf-c914-42cd-ab7a-6703a635fcd5.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/210b0fdf-c914-42cd-ab7a-6703a635fcd5.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/210b0fdf-c914-42cd-ab7a-6703a635fcd5
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T20:07:57Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xd2b746c6670e664517fe7555898a68320465d9ac426e1a04aa8072134586e7dd","name":"Jan Broekhuis","registered_at":"2026-06-16T01:06:30Z","symbol":"NIM0889246","token_address":"0xdcded0c3f51cd075fec90a41448f594db66cd1d6","type":"artist","uuid":"210b0fdf-c914-42cd-ab7a-6703a635fcd5"}
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 0xd2b746c6670e664517fe7555898a68320465d9ac426e1a04aa8072134586e7dd. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/210b0fdf-c914-42cd-ab7a-6703a635fcd5.json and https://artists.proofprofile.net/proofs/artist/210b0fdf-c914-42cd-ab7a-6703a635fcd5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T20:07:57Z
  text: {"copyright_id":"0xd2b746c6670e664517fe7555898a68320465d9ac426e1a04aa8072134586e7dd","name":"Jan Broekhuis","registered_at":"2026-06-16T01:06:30Z","symbol":"NIM0889246","token_address":"0xdcded0c3f51cd075fec90a41448f594db66cd1d6","type":"artist","uuid":"210b0fdf-c914-42cd-ab7a-6703a635fcd5"}