Privacy-Preserving Redactable Blockchain for Internet of Things

Algorithm 1

(implements ).

	Input: Blockchain , redaction request
	Output: 0/1
(1)	Parse the original -th block ;
(2)	Parse the old block data ;
(3)	Replace the old transaction with the initial candidate transaction ;
(4)	Parse the new block data ;
(5)	Parse the redacted -th block ;
(6)	If , return 0;
(7)	Parse the initial candidate transaction .
(8)	Calculate using the disclosed transaction data and encryption key .
(9)	Compare with the ciphertext in the original transaction. If not equal, return 0;
(10)	Validate the ring signature contained in the redacted transaction and compare the message signed by with the digest , if not equal return 0;
(11)	Return 1.