Thijs van Leer
type: MusicGroup
description: Thijs van Leer (; born 31 March 1948) is a Dutch musician, best known as the founding member of the rock band Focus as its primary vocalist, keyboardist, and flautist. Born and raised in Amsterdam amo
popularity: 9
followers: 16
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xb7ce2414d091d339e70cc0c001195f918dc2b3e7fab000fd2300df70eb53b56a
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/5c549db5-8ce5-4438-9eee-87b92c4a6645.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/5c549db5-8ce5-4438-9eee-87b92c4a6645.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/5c549db5-8ce5-4438-9eee-87b92c4a6645
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xb7ce2414d091d339e70cc0c001195f918dc2b3e7fab000fd2300df70eb53b56a","name":"Thijs van Leer","registered_at":"2026-06-16T21:45:54Z","symbol":"NIM1185068","token_address":"0x53ae243c248e5c35e2213e015a95cd1b5ce6f381","type":"artist","uuid":"5c549db5-8ce5-4438-9eee-87b92c4a6645"}
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 0xb7ce2414d091d339e70cc0c001195f918dc2b3e7fab000fd2300df70eb53b56a. 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/5c549db5-8ce5-4438-9eee-87b92c4a6645.json and https://artists.proofprofile.net/proofs/artist/5c549db5-8ce5-4438-9eee-87b92c4a6645.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0xb7ce2414d091d339e70cc0c001195f918dc2b3e7fab000fd2300df70eb53b56a","name":"Thijs van Leer","registered_at":"2026-06-16T21:45:54Z","symbol":"NIM1185068","token_address":"0x53ae243c248e5c35e2213e015a95cd1b5ce6f381","type":"artist","uuid":"5c549db5-8ce5-4438-9eee-87b92c4a6645"}