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Re:Bitcoinfs: A minimal full Bitcoin node in F# by lightlike on Sunday January 25, 2015 @03:04PM (#8944054)
Re:Bitcoinfs: A minimal full Bitcoin node in F# by xkarga00 on Sunday January 25, 2015 @06:15PM (#8944658)
From their README:

   Features: 
   * [...]
   * Headerchain implementation (Blockchain with headers only)
   * [...]
This makes Haskoin more of an SPV client rather than a full-node client.