How many nodes need to collude to harm Casper or Sharded Eth? - Economics - Ethereum Research


    
    
  
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      How many nodes need to collude to harm Casper or Sharded Eth?
    


      
          
            
              
              
                Proof-of-Stake
              
            
            



            
              
              
                Economics
              
            
            
      

        

            

            
              
                Equilibrium94
                
              

              



              
                  
                    August 16, 2019,  9:36pm
                  
                  

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              How many and can you explain why? (I’m familiar with big O notation) Thanks!

            


            
              

            

            
                

            
              
                adlerjohn
                
              

              


                


              
                  
                    August 17, 2019,  1:24am
                  
                  

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              2/3+1 of 128 i.e., 86 validators, of 32 ETH each.

How committee size for shards is determined:


  
      
      Medium – 15 Jul 19
  
  
    


Minimum Committee Size Explained


How many validators sampled can make a committee safe?


  Reading time: 4 min read
    


  
  
    
    
  

  



How to bribe said committee:


  
      NEAR Protocol – 24 Oct 18
  
  
    


How Unrealistic is Bribing Frequently Rotated Validators? - NEAR Protocol


Many proposed blockchain protocols today use some sorts of committees to propose and validate blocks. The committees are at the…



  
  
    
    
  

  



            


            
              
1 Like
            

            
                

            
              
                Equilibrium94
                
              

              



              
                  
                    August 17, 2019,  5:00pm
                  
                  

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              Thanks! And and are the validators chosen pusdo randomly? And how often are they rotated out?

            


            
              

            

            
                

            
              
                vbuterin
                
              

              



              
                  
                    August 18, 2019,  5:16am
                  
                  

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              They are rotated once per epoch, with a lookahead period of one epoch.

            


            
              

            

            
                
	
        
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