Phạm Duy
type: MusicGroup
genre: traditional music
description: Phạm Duy (5 October 1921 – 27 January 2013) was a Vietnamese songwriter. With more than one thousand songs to his credit, he is widely considered one of the three most salient and influential figures
popularity: 9
followers: 3338
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x8e6480adb4b8161d910b213065c55d02c7f8f7431b0fb40405fccf7f604b8f64
additional property: OTSHash
additional property: OTSBitcoinBlock
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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/e943844f-b1ac-486e-a8b6-70072134189a.ots
additional property: OTSRecordURL
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  value: https://artists.proofprofile.net/proofs/artist/e943844f-b1ac-486e-a8b6-70072134189a.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/e943844f-b1ac-486e-a8b6-70072134189a
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-22T02:53:59Z
additional property: OTSCanonicalRecord
  type: PropertyValue
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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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e6480adb4b8161d910b213065c55d02c7f8f7431b0fb40405fccf7f604b8f64. 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/e943844f-b1ac-486e-a8b6-70072134189a.json and https://artists.proofprofile.net/proofs/artist/e943844f-b1ac-486e-a8b6-70072134189a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-22T02:53:59Z
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album: Folk Songs of Vietnam
  type: MusicAlbum
  date published: 1968-01-01
album: 10 Bài Tâm Ca
  type: MusicAlbum
  date published: 1980-10-05
album: Ky Niem
  type: MusicAlbum
  date published: 1992
album: Ngay Do Chung Minh
  type: MusicAlbum
  date published: 1993
album: Tieng Dan Toi
  type: MusicAlbum
  date published: 1996
album: Tuyệt phẩm tiền chiến 1
  type: MusicAlbum
  date published: 2000-01-01
  track: Nương chiều
    type: MusicRecording
    duration: PT5M25S
    duration ms: 325466
    explicit: false
    by artist: Phạm Duy
    in album: Tuyệt phẩm tiền chiến 1
      type: MusicAlbum
      date published: 2000-01-01
    genre: traditional music
    isrc code: VNA0F1766063
    additional property: CopyrightID
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    additional property: OTSHash
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    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956856
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/VNA0F1766063
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-06T01:25:57Z
    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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f81cc8b8b6c1112239230cb59931387a30a3728adac68c23fbb13bdbdecdcc1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/VNA0F1766063.
      date published: 2026-07-06T01:25:57Z
    audio: Nương chiều
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 78.219
      additional property: Musical Key
        type: PropertyValue
        value: 7
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 3
      additional property: Danceability
        type: PropertyValue
        value: 0.199
      additional property: Energy
        type: PropertyValue
        value: 0.296
      additional property: Speechiness
        type: PropertyValue
        value: 0.034
      additional property: Acousticness
        type: PropertyValue
        value: 0.923
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.136
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.179
      additional property: Loudness (dB)
        type: PropertyValue
        value: -10.298
      additional property: Key Name
        type: PropertyValue
        value: G
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Hen Ho - Pham Duy
  type: MusicAlbum
  date published: 2010-01-01
album: Bai Ca Dao
  type: MusicAlbum
  date published: 2013-04-18