Marga Höffgen
type: MusicGroup
description: Marga Anna Johanna Höffgen (26 April 1921 – 7 July 1995) was a German contralto, known for singing oratorios, especially the Passions by Johann Sebastian Bach, and operatic parts such as Erda in Wagne
popularity: 13
followers: 235
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xadfab236ff77028cc94d051e2ac63d4a75508981d8c2dd11ff0df03ac39e0221
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953625
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953625
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/227381b1-403c-4956-a4ff-41915c9d5945.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/227381b1-403c-4956-a4ff-41915c9d5945.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/227381b1-403c-4956-a4ff-41915c9d5945
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T11:37:06Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xadfab236ff77028cc94d051e2ac63d4a75508981d8c2dd11ff0df03ac39e0221","name":"Marga Höffgen","registered_at":"2026-06-14T08:02:30Z","symbol":"NIM0389588","token_address":"0xafb2f8e02924e52d2acbc3dfe11cce02ec38b422","type":"artist","uuid":"227381b1-403c-4956-a4ff-41915c9d5945"}
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 0xadfab236ff77028cc94d051e2ac63d4a75508981d8c2dd11ff0df03ac39e0221. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/227381b1-403c-4956-a4ff-41915c9d5945.json and https://artists.proofprofile.net/proofs/artist/227381b1-403c-4956-a4ff-41915c9d5945.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T11:41:45Z
  text: {"copyright_id":"0xadfab236ff77028cc94d051e2ac63d4a75508981d8c2dd11ff0df03ac39e0221","name":"Marga Höffgen","registered_at":"2026-06-14T08:02:30Z","symbol":"NIM0389588","token_address":"0xafb2f8e02924e52d2acbc3dfe11cce02ec38b422","type":"artist","uuid":"227381b1-403c-4956-a4ff-41915c9d5945"}
album: Wagner: Siegfried (Recorded Live 1959)
  type: MusicAlbum
  date published: 2014-11-01
album: Wagner: Siegfried, WWV 86c (Recorded 1960) [Live]
  type: MusicAlbum
  date published: 2015-01-01