Helen Traubel
type: MusicGroup
genre: opera
description: Helen Francesca Traubel (June 16, 1899July 28, 1972) was an American opera and concert singer. A dramatic soprano, she was best known for her Wagnerian roles, especially those of Brünnhilde and Isolde
popularity: 3
followers: 544
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x9c7746958c53ac63f110b43323f6bc587b88323ddd1084ff83846b111b61a896
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954623
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954623
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/cacdc1e1-f29a-4cd2-9306-e6aef6bbc1b5.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/cacdc1e1-f29a-4cd2-9306-e6aef6bbc1b5.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/cacdc1e1-f29a-4cd2-9306-e6aef6bbc1b5
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T23:40:06Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x9c7746958c53ac63f110b43323f6bc587b88323ddd1084ff83846b111b61a896","name":"Helen Traubel","registered_at":"2026-06-20T22:39:24Z","symbol":"NIM1736349","token_address":"0x8cde617183dad5b0ff5e50fc69585d41756340f7","type":"artist","uuid":"cacdc1e1-f29a-4cd2-9306-e6aef6bbc1b5"}
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 0x9c7746958c53ac63f110b43323f6bc587b88323ddd1084ff83846b111b61a896. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cacdc1e1-f29a-4cd2-9306-e6aef6bbc1b5.json and https://artists.proofprofile.net/proofs/artist/cacdc1e1-f29a-4cd2-9306-e6aef6bbc1b5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T23:40:06Z
  text: {"copyright_id":"0x9c7746958c53ac63f110b43323f6bc587b88323ddd1084ff83846b111b61a896","name":"Helen Traubel","registered_at":"2026-06-20T22:39:24Z","symbol":"NIM1736349","token_address":"0x8cde617183dad5b0ff5e50fc69585d41756340f7","type":"artist","uuid":"cacdc1e1-f29a-4cd2-9306-e6aef6bbc1b5"}
album: Lauritz Melchior in Concert 1944 - 1949
  type: MusicAlbum
  date published: 2021-07-02