Simon Keizer
type: MusicGroup
description: Simon Nicolaas (Simon) Keizer (Volendam, born 16 May 1984) is a Dutch singer-songwriter. Together with Nick Schilder, he formed a duo called Nick & Simon. Biography Simon wrote his first song in 2000
popularity: 3
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf2832f7f56e4ac867063c0c9c385cc54915921e01d4e29222f842d8c2fbe7c84
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953899
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953899
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/11414a5d-5ddb-44a8-926c-16c09c71af51.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/11414a5d-5ddb-44a8-926c-16c09c71af51.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/11414a5d-5ddb-44a8-926c-16c09c71af51
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T06:37:25Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xf2832f7f56e4ac867063c0c9c385cc54915921e01d4e29222f842d8c2fbe7c84","name":"Simon Keizer","registered_at":"2026-06-15T19:32:31Z","symbol":"NIM0809569","token_address":"0x98f4adab782af21a2c0bcde391cb8784e86589b4","type":"artist","uuid":"11414a5d-5ddb-44a8-926c-16c09c71af51"}
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 0xf2832f7f56e4ac867063c0c9c385cc54915921e01d4e29222f842d8c2fbe7c84. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/11414a5d-5ddb-44a8-926c-16c09c71af51.json and https://artists.proofprofile.net/proofs/artist/11414a5d-5ddb-44a8-926c-16c09c71af51.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T06:37:25Z
  text: {"copyright_id":"0xf2832f7f56e4ac867063c0c9c385cc54915921e01d4e29222f842d8c2fbe7c84","name":"Simon Keizer","registered_at":"2026-06-15T19:32:31Z","symbol":"NIM0809569","token_address":"0x98f4adab782af21a2c0bcde391cb8784e86589b4","type":"artist","uuid":"11414a5d-5ddb-44a8-926c-16c09c71af51"}