Pierre van der Linden
type: MusicGroup
description: Pierre van der Linden (born 19 February 1946) is a Dutch drummer, songwriter and member of the band, Focus.AllMusic Focus Biography Early life Pierre van der Linden was born in Amsterdam in 1946. H
popularity: 8
followers: 109
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd0d679814d1e38234c2468a60ccc76e17509f434adcaadcbe1012e590fc5fc18
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954728
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954728
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f855e074-2784-4096-9090-726a1aba56cc.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f855e074-2784-4096-9090-726a1aba56cc.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/f855e074-2784-4096-9090-726a1aba56cc
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T18:08:38Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xd0d679814d1e38234c2468a60ccc76e17509f434adcaadcbe1012e590fc5fc18","name":"Pierre van der Linden","registered_at":"2026-06-21T16:13:44Z","symbol":"NIM1969037","token_address":"0xc51db8d056d15c5416557ba7c5917268850113c8","type":"artist","uuid":"f855e074-2784-4096-9090-726a1aba56cc"}
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 0xd0d679814d1e38234c2468a60ccc76e17509f434adcaadcbe1012e590fc5fc18. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f855e074-2784-4096-9090-726a1aba56cc.json and https://artists.proofprofile.net/proofs/artist/f855e074-2784-4096-9090-726a1aba56cc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T18:08:38Z
  text: {"copyright_id":"0xd0d679814d1e38234c2468a60ccc76e17509f434adcaadcbe1012e590fc5fc18","name":"Pierre van der Linden","registered_at":"2026-06-21T16:13:44Z","symbol":"NIM1969037","token_address":"0xc51db8d056d15c5416557ba7c5917268850113c8","type":"artist","uuid":"f855e074-2784-4096-9090-726a1aba56cc"}
album: Drum Poetry
  type: MusicAlbum
  date published: 2017-02-10
album: Drum Poetry
  type: MusicAlbum
  date published: 2017-02-10