John Duffey
type: MusicGroup
genre: bluegrass
genre: christian country
description: John Humbird Duffey Jr. (March 4, 1934 – December 10, 1996) was an American bluegrass musician. Biography Duffey was born on March 4, 1934, in Washington, D.C., and lived nearly all his life in the
popularity: 3
followers: 373
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0xfbf58022c04aba5478ce43b4c13a290018355f3d19eab82c0d002fdd69a71929
additional property: OTSHash
additional property: OTSBitcoinBlock
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  value: 954587
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954587
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b9191171-5fc8-4c7e-b28a-efbc1f6b1894.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b9191171-5fc8-4c7e-b28a-efbc1f6b1894.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/b9191171-5fc8-4c7e-b28a-efbc1f6b1894
additional property: OTSTimestamp
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  value: 2026-06-20T19:10:41Z
additional property: OTSCanonicalRecord
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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 0xfbf58022c04aba5478ce43b4c13a290018355f3d19eab82c0d002fdd69a71929. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b9191171-5fc8-4c7e-b28a-efbc1f6b1894.json and https://artists.proofprofile.net/proofs/artist/b9191171-5fc8-4c7e-b28a-efbc1f6b1894.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T19:10:41Z
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album: Bluegrass At Carnegie Hall
  type: MusicAlbum
  date published: 2005
album: Bluegrass At Carnegie Hall
  type: MusicAlbum
  date published: 2005
album: Always In Style
  type: MusicAlbum
  date published: 2006-01-01
album: The Rebel Years: 1962-1977
  type: MusicAlbum
  date published: 2011-06-07
album: The Rebel Years: 1962-1977
  type: MusicAlbum
  date published: 2011-06-07
album: The Rebel Years: 1962-1977
  type: MusicAlbum
  date published: 2011-06-07
album: The Rebel Years: 1962-1977
  type: MusicAlbum
  date published: 2011-06-07
album: Big Daddy the Truck Driving Man
  type: MusicAlbum
  date published: 2012-05-05
album: Strolling On the Beach
  type: MusicAlbum
  date published: 2012-07-07