Analysis and Improvement of Blockchain-Based Multilevel Privacy-Preserving Location Sharing Scheme for Telecare Medical Information Systems

Algorithm 4

Location verification.

	Input:
	Response from LDO response; Record in the blockchain ; Session key with LDOkses
	Output:
	Boolean variable b
(1)	initialize bFalse;
(2)	ifthen
(3)	if Hash .LocInfok LocHashkthen
(4)	bTrue
(5)	end if
(6)	else ifthen
(7)
(8)	;
(9)	;
(10)	;
(11)	;
(12)	;
(13)
(14)	ifthen
(15)	if    then
(16)	bTrue
(17)	end if
(18)	end if
(19)	end if
(20)	return b;