A Survey of How to Use Blockchain to Secure Internet of Things and the Stalker Attack

Table 1

Comparison between Blockchain systems.

Blockchain	Bitcoin	Ethereum	Hyperledger	Ripple
Nature	Permissionless	Permissionless	Permissioned	Permissioned
Validation	PoW	Ethash PoW	PBFT	BFT customized (RPCA)
	SHA-256
Purpose	cryptocurrency	Smart contract	Chaincode	Cryptocurrency
Language	Stack based scripts	Internal code	Go, Java	C++
		Turing complete
Block processing time	600 s	15 s	Real time	Real time