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

Algorithm 1

Generation of registration record.

	Input:
	Region ; Maximum level of location partition N; LDO’s secret key
	Output:
	Registration record
	(1)
	(2) for
	(3)
	(4)
	(5)
	(6)
	(7) end for
	(8)
	(9)
	(10)
	(11) return .