Formal Modelling of PBFT Consensus Algorithm in Event-B

Listing 3

Event ‘Go_faulty’.

Event Go_faulty

ANYnode

 Where

     @grd1 node∈corr

     @grd2 3(corr∖{node})≥2(NODES)+1

     @grd3 step1=Commit1∨step1=Reply1

 Then

     @act1 corr≔corr∖{node}

     @act2 faulty≔faulty∪{node}

 End