A Four-Tier Smart Contract Model with On-Chain Upgrade

Algorithm 1

Contract on-chain upgrade algorithm.

	Input:
	contractAddr
	userAddr
	userId
	operation
	Output:
	bool
(1)	Begin
(2)	Role ← invokeUserContract (userAddr, userId)
(3)	If (!verifyAuthority (role, operation))
(4)	return false
(5)	ValidationContractInstance ← loadValidationContract ()
(6)	If (!verifyContract (validationContractInstance, contractAddr))
(7)	return false
(8)	ProxyContractInstance ← loadProxyContract()
(9)	UpdateInfo ← updateContractAddr (proxyContractInstance, contractAddr, operation)
(10)	DestroyInfo ← destroyOldContract()
(11)	If (!save (updateInfo, destroyInfo))
(12)	return false
(13)	return true
(14)	End