Willy Maertens
type: MusicGroup
description: Willy Maertens (1893–1967) was a German film and television actor.Shandley p.211 He was married to the actress Charlotte Kramm with whom he had a son Peter Maertens. Selected filmography Attack on
popularity: 5
followers: 10
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x6b67ddf9dffff2495713112108ebfd69d1ebe8909fb594aa254acf9860c8ea12
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954784
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954784
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/efa378a6-8ce7-42ea-b13a-367886fe9e93.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/efa378a6-8ce7-42ea-b13a-367886fe9e93.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/efa378a6-8ce7-42ea-b13a-367886fe9e93
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-22T02:53:59Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x6b67ddf9dffff2495713112108ebfd69d1ebe8909fb594aa254acf9860c8ea12","name":"Willy Maertens","registered_at":"2026-06-21T19:02:02Z","symbol":"NIM1923004","token_address":"0x670c9b12608cb77cf1d4f611a39320c99428d2d7","type":"artist","uuid":"efa378a6-8ce7-42ea-b13a-367886fe9e93"}
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 0x6b67ddf9dffff2495713112108ebfd69d1ebe8909fb594aa254acf9860c8ea12. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/efa378a6-8ce7-42ea-b13a-367886fe9e93.json and https://artists.proofprofile.net/proofs/artist/efa378a6-8ce7-42ea-b13a-367886fe9e93.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-22T02:53:59Z
  text: {"copyright_id":"0x6b67ddf9dffff2495713112108ebfd69d1ebe8909fb594aa254acf9860c8ea12","name":"Willy Maertens","registered_at":"2026-06-21T19:02:02Z","symbol":"NIM1923004","token_address":"0x670c9b12608cb77cf1d4f611a39320c99428d2d7","type":"artist","uuid":"efa378a6-8ce7-42ea-b13a-367886fe9e93"}