Aart Staartjes
type: MusicGroup
genre: children's music
description: Aart Staartjes (1 March 1938 – 12 January 2020) was a Dutch actor, director, television presenter and documentary maker from Amsterdam. He portrayed Meneer Aart ("Mister Aart") on Sesamstraat, the Dut
popularity: 9
followers: 241
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0b228e830598dedb906d41bf962dc7590d63d5f32664f0bdf098c742260adcc1
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/77c93b39-7298-4ed9-9abf-d0d9d4292ddf.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/77c93b39-7298-4ed9-9abf-d0d9d4292ddf.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/77c93b39-7298-4ed9-9abf-d0d9d4292ddf
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x0b228e830598dedb906d41bf962dc7590d63d5f32664f0bdf098c742260adcc1","name":"Aart Staartjes","registered_at":"2026-06-17T07:25:50Z","symbol":"NIM1323461","token_address":"0x9f890c332b6b17be1c8e7c6d4587361f3fd240ed","type":"artist","uuid":"77c93b39-7298-4ed9-9abf-d0d9d4292ddf"}
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 0x0b228e830598dedb906d41bf962dc7590d63d5f32664f0bdf098c742260adcc1. Chain 2 (Bitcoin): anchored in block 954115 (2026-06-17T15:44:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/77c93b39-7298-4ed9-9abf-d0d9d4292ddf.json and https://artists.proofprofile.net/proofs/artist/77c93b39-7298-4ed9-9abf-d0d9d4292ddf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T15:44:10Z
  text: {"copyright_id":"0x0b228e830598dedb906d41bf962dc7590d63d5f32664f0bdf098c742260adcc1","name":"Aart Staartjes","registered_at":"2026-06-17T07:25:50Z","symbol":"NIM1323461","token_address":"0x9f890c332b6b17be1c8e7c6d4587361f3fd240ed","type":"artist","uuid":"77c93b39-7298-4ed9-9abf-d0d9d4292ddf"}