Wireless Communications and Mobile Computing

Research Article

Blockchain-Empowered High-Frequency Spectrum Management IoT: A Multilayer PBFT Consensus Perspective

Algorithm 3

Two-layer PBFT consensus: .
 while valid sub-pre-prepare2 received=True do
  multicasts sub-prepare2 to in the same
  consensus group
 end while
 while valid sub-prepare2 received=True do
  if number of valid sub-prepare2≥2fthen
   sub-prepare2=valid
   multicasts sub-commit2 to in the same
   consensus group
  end if
 end while
 while valid sub-commit2 received=True do
  if number of valid sub-commit2≥2fthen
   sub-commit2=valid
   send sub-reply2 to group leader
  end if
 end while