XPost: alt.privacy.anon-server, sci.crypt   
   From: info@tcpreset.invalid   
      
   Nomen Nescio wrote:   
   > What I don't understand, why the POW cannot be automatically   
   > done by the server, without user input and why a digital sig   
   > is used, nobody can verify because a server or third parties   
   > would never fiddle around with the usual Usenet blah blah...   
      
   PoW (Proof-of-Work) must be client-side by design. If the server   
   generated it, anyone could spawn thousands of posts without   
   computational cost, defeating the anti-spam purpose. By requiring client   
   side hashcash, each message submission makes a real CPU cost (30-120   
   seconds), making automated bulk posting economically unfeasible for   
   spambots.   
   Digital signatures provide message integrity and authorship proof. While   
   there's no central PKI, recipients can verify that messages with the   
   same public key come from the same sender. This enables reputation   
   tracking and spam filtering without requiring centralized identity   
   verification, preserving privacy while adding accountability.   
      
   The goal: make spam expensive, legitimate posting affordable.   
      
   Gabx   
      
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