Meindert W. Kramer
type: MusicGroup
popularity: 6
followers: 63
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x4c14a8e71d8800b4a7667be09b1c0f3bf4460fa1b55eb0397538670177b3215c
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954638
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954638
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d4c68990-0f6a-4758-b520-33d30b68c7fd.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d4c68990-0f6a-4758-b520-33d30b68c7fd.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/d4c68990-0f6a-4758-b520-33d30b68c7fd
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T03:45:44Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x4c14a8e71d8800b4a7667be09b1c0f3bf4460fa1b55eb0397538670177b3215c","name":"Meindert W. Kramer","registered_at":"2026-06-21T02:21:47Z","symbol":"NIM1790109","token_address":"0xd83ad937b8c36fcf048b0ee8dfd8469765e22e62","type":"artist","uuid":"d4c68990-0f6a-4758-b520-33d30b68c7fd"}
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 0x4c14a8e71d8800b4a7667be09b1c0f3bf4460fa1b55eb0397538670177b3215c. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4c68990-0f6a-4758-b520-33d30b68c7fd.json and https://artists.proofprofile.net/proofs/artist/d4c68990-0f6a-4758-b520-33d30b68c7fd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T03:45:44Z
  text: {"copyright_id":"0x4c14a8e71d8800b4a7667be09b1c0f3bf4460fa1b55eb0397538670177b3215c","name":"Meindert W. Kramer","registered_at":"2026-06-21T02:21:47Z","symbol":"NIM1790109","token_address":"0xd83ad937b8c36fcf048b0ee8dfd8469765e22e62","type":"artist","uuid":"d4c68990-0f6a-4758-b520-33d30b68c7fd"}
album: Koor en Samenzand uit Urk
  type: MusicAlbum
  date published: 2015-09-24