Egil Harder
type: MusicGroup
genre: classical piano
description: Egil Georg Harder (7 April 1917 – 7 April 1997) was a Danish pianist, composer, conductor, and music educator. Early life and education Egil Harder was born in Copenhagen, Denmark. He showed an ear
popularity: 2
followers: 17
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSTimestamp
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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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e01fe690a10aedc667fb6b449af5ec11f0e5d5e517ec73815bc6550aecd137. Chain 2 (Bitcoin): anchored in block 954008 (2026-06-16T21:31:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/33ae4adb-b39f-4196-9355-43cfb707dff6.json and https://artists.proofprofile.net/proofs/artist/33ae4adb-b39f-4196-9355-43cfb707dff6.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-16T21:31:27Z
  text: {"copyright_id":"0x94e01fe690a10aedc667fb6b449af5ec11f0e5d5e517ec73815bc6550aecd137","name":"Egil Harder","registered_at":"2026-06-16T07:32:03Z","symbol":"NIM0981344","token_address":"0x370b9a0c11e722ecd88a4cce37e6d6edea959056","type":"artist","uuid":"33ae4adb-b39f-4196-9355-43cfb707dff6"}
album: Juletræet med sin pynt (Arr. for Voice & Choir by Henrik Metz)
  type: MusicAlbum
  date published: 1997-01-01
track: Den blå anemone (Arr. H. Metz for Choir)
  type: MusicRecording
  duration: PT3M2S
  duration ms: 182613
  explicit: false
  by artist: Egil Harder
  by artist: DR Vokal Ensemblet
  by artist: Bo Holten
  in album: Årstiderne: 28 danske sange
    type: MusicAlbum
    date published: 2018-08-17
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  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKHJ61800204
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-08T03:20:19Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04aaae5ab8daa6f728845899ccfd7dfc0c3613318b8fd470eacccd421e75f8b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKHJ61800204 — a six-check JSON result.
    date published: 2026-07-08T03:20:19Z
  audio: Den blå anemone (Arr. H. Metz for Choir)
    type: AudioObject
    additional property: Tempo (BPM)
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    additional property: Mode (Major/Minor)
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    additional property: Time Signature
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    additional property: Danceability
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    additional property: Energy
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    additional property: Speechiness
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    additional property: Acousticness
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    additional property: Instrumentalness
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    additional property: Liveness
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    additional property: Valence (Positivity)
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      value: 0.134
    additional property: Loudness (dB)
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      value: -24.85
    additional property: Key Name
      type: PropertyValue
      value: A
    additional property: Mode Name
      type: PropertyValue
      value: Major