[Retracted] A Novel Structure of Blockchain Applied in Vaccine Quality Control: Double-Chain Structured Blockchain System for Vaccine Anticounterfeiting and Traceability

Table 4

Novel plan comparison.

	Novel plan	Plan in [3]
Traceability links	Manufacture, examination, storage, transportation, injection	Manufacture, examination, injection
Information data structure	Struct	String
	Call a smart contract to store multiple pieces of information	Smart contract store is invoked multiple times
Privacy protection	The private chain stores vaccination information to protect patient privacy	All data is stored in Ethereum without privacy protection
Anticounterfeiting effectiveness	EPC fraud	EPC fraud
	EPC label replication
Quality supervision	Transfer after passing the incubation period, and check the balance of the account to complete the quality supervision	None
Transaction format	After quality supervision is passed, the money is transferred	Vaccine coin transfer
Cost	4 trade gas	3 trade gas