Algorithm 3. BSF-EHR Blockchain Validation Algorithm
Input	:	Patient Pat1 blockchain
Output	:	Safe or not
Step 1	:	Blockchain BC ← Download Blockchain of Patient Pat1
Step 2		BlockchainStatus = “Safe”
Step 3	:	FOR each Block B from BC
Step 4	:	Block → Retrieve encryptedEHR, hash with Bilinear Map from the block
Step 5	:	newHash ← Generate new hash for encryptedEHR based on HMAC-SHA1
Step 6	:	newBilinearMap ← Generate new bilinear maping for encryptedEHR with patient ID
Step 7	:	IF ((hash == New Hash)&(Bilinear Map = newBilinearMap))
Step 8	:	Block is safe
Step 9	:	ELSE
Step 10	:	Block is not safe
		BlockchainStatus = “Not Safe”.
Step 11	:	Break
Step 12	:	END FOR