Wireless Communications and Mobile Computing

Research Article

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

Algorithm 2

Two-layer PBFT consensus: .
 while valid pre-prepare1 received=True do
  multicasts prepare1 to
 end while
 while valid prepare1 received=True do
  if number of valid prepare1≥2fthen
   prepare1=valid
   multicasts commit1 to
  end if
 end while
 while valid commit1 received=True do
  if number of valid commit1≥2fthen
   commit1=valid
   multicasts sub-pre-prepare2 to
  end if
 end while
 while valid sub-prepare2 received=True do
  if number of valid sub-prepare2≥2fthen
   sub-prepare2=valid
   reply primary with reply1
  end if
 end while
 while valid sub-commit2 received=True do
  if number of valid sub-commit2≥ 2f then
   reply client with reply1
  end if
 end while