Trusted and Efficient Cross-Domain Access Control System Based on Blockchain

Algorithm 4

getURole.

(1)	Input: uID
(2)	output: string
(3)	% obtain the user’s role from blockchain.
(4)	role = stub.GetState (uID)
(5)	if role ! = null then
(6)	return role;
(7)	else
(8)	return ‘9000’;