Blockchain for decentralization of internet: prospects, trends, and challenges

Table 4 Comparison of BFT and crash-based consensus algorithm (IoT Suitability Level of compatibility with IoT, Efficiency for DI Level of efficiency in achieving decentralization)

Consensus algorithm	Blockchain type	Permission type	Decentralization	IoT suitability	Efficiency for DI	Remarks
PBFT	Private	Permissioned	Medium	Yes	High	Limited scalability
dBFT	Private	Permissioned	Medium	Plausible	Low	Suffers with low network speed
SCP & ripple	Public	Permissionless	High	Plausible	Medium	Suffers with latency issues
Hyperledger & variants	Private	Permissioned	Low	Mostly no	Low to Medium	Requires further improvements for a lot of the variants
PoA (Authority)	Private	Permissionless	Low	No	Medium	Conflicting design methodology
Paxos	Private	Permissioned	Low	No	High	Needs to be adapted
Raft	Private	Permissioned	Medium	Plausible	High	Requires further improvements