Koos Van Der Merwe
type: MusicGroup
description: Jacobus Hercules "Koos" van der Merwe (4 August 1937 – 22 September 2024) was a South African politician. He was a member of the South African Parliament, representing the National Party, Conservative
popularity: 6
followers: 773
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x7a5726668b9cf2929ad23bc4d95cf3f1a8504b32834acd99fa2355cd688a0181
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953958
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953958
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/2762feae-61ce-4d66-98c1-d88c9ea070b9.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/2762feae-61ce-4d66-98c1-d88c9ea070b9.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/2762feae-61ce-4d66-98c1-d88c9ea070b9
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T14:52:44Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x7a5726668b9cf2929ad23bc4d95cf3f1a8504b32834acd99fa2355cd688a0181","name":"Koos Van Der Merwe","registered_at":"2026-06-16T03:14:34Z","symbol":"NIM0919840","token_address":"0x2b231dbc95f4690be475123b0212367cce54bf70","type":"artist","uuid":"2762feae-61ce-4d66-98c1-d88c9ea070b9"}
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 0x7a5726668b9cf2929ad23bc4d95cf3f1a8504b32834acd99fa2355cd688a0181. Chain 2 (Bitcoin): anchored in block 953958 (2026-06-16T14:52:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2762feae-61ce-4d66-98c1-d88c9ea070b9.json and https://artists.proofprofile.net/proofs/artist/2762feae-61ce-4d66-98c1-d88c9ea070b9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T14:52:44Z
  text: {"copyright_id":"0x7a5726668b9cf2929ad23bc4d95cf3f1a8504b32834acd99fa2355cd688a0181","name":"Koos Van Der Merwe","registered_at":"2026-06-16T03:14:34Z","symbol":"NIM0919840","token_address":"0x2b231dbc95f4690be475123b0212367cce54bf70","type":"artist","uuid":"2762feae-61ce-4d66-98c1-d88c9ea070b9"}
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  type: MusicAlbum
  date published: 2013-05-13
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  type: MusicAlbum
  date published: 2015-05-18
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  type: MusicAlbum
  date published: 2017-06-01