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

Algorithm 9

Location extraction.

	Input:
	Response from LDO ; Record in the blockchain ; LDR’s private key
	Output:
	Location or rectangular border , or
(1)	;
(2)	if then
(3)	if. then
(4)	;
(5)	end if
(6)	else ifthen
(7)
(8)	; ;
(9)	; ;
(10)	;
(11)	;
(12)	if then
(13)	if
	then
(14)	; ;
(15)	; ;
(16)	;
(17)	end if
(18)	end if
(19)	end if
(20)	return.