Berthold Possemeyer
type: MusicGroup
description: Berthold Klemens Possemeyer (born 20 May 1951) is a German baritone in opera and concert, and a voice teacher at the University of Music and Performing Arts in Frankfurt am Main. Career Possemeyer
popularity: 2
followers: 11
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xac545b8d2093618d5b7745643d208002be2cc76339389d1a1b49b0771abfdbec
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954062
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954062
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/464b756b-b857-4c48-b6f3-48e00a7b7a70.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/464b756b-b857-4c48-b6f3-48e00a7b7a70.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/464b756b-b857-4c48-b6f3-48e00a7b7a70
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T07:39:10Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xac545b8d2093618d5b7745643d208002be2cc76339389d1a1b49b0771abfdbec","name":"Berthold Possemeyer","registered_at":"2026-06-16T14:12:45Z","symbol":"NIM1076943","token_address":"0x670e38eb23ebe6b8073c018144dc345cecff795f","type":"artist","uuid":"464b756b-b857-4c48-b6f3-48e00a7b7a70"}
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 0xac545b8d2093618d5b7745643d208002be2cc76339389d1a1b49b0771abfdbec. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/464b756b-b857-4c48-b6f3-48e00a7b7a70.json and https://artists.proofprofile.net/proofs/artist/464b756b-b857-4c48-b6f3-48e00a7b7a70.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:10:43Z
  text: {"copyright_id":"0xac545b8d2093618d5b7745643d208002be2cc76339389d1a1b49b0771abfdbec","name":"Berthold Possemeyer","registered_at":"2026-06-16T14:12:45Z","symbol":"NIM1076943","token_address":"0x670e38eb23ebe6b8073c018144dc345cecff795f","type":"artist","uuid":"464b756b-b857-4c48-b6f3-48e00a7b7a70"}
album: Mendelssohn: Vom Himmel hoch. Kirchenwerke II
  type: MusicAlbum
  date published: 1985-10-01