Research on Grain Food Blockchain Traceability Information Management Model Based on Master-Slave Multichain

Algorithm 5

PLEW algorithm.

	Input: Candidate: Candidate
	Output: Improve PoW Leader: P-leader
(1)	timeWait = true
(2)	Candidate——>server
	//Broadcast the request to be the leader in the candidate queue and wait for the approval of other candidate nodes
(3)	for ! timeWait do
(4)	if reciveResponse () ! = true then
(5)	//There are candidate nodes with longer waiting time in the queue
(6)	sever.State = follower
(7)	Candidate.Delete (server)
(8)	return null l
(9)	end if
(10)	server.State = leader
(11)	server.Wait = 0
(14)	def hash (server)
(15)	def proof (server)
(16)	server.leader = P-leader//Select leader node
(17)	return P-leader
(18)	end for