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

Table 3 Comparison of proof-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
PoW (Work)	Public & private	Permissioned	Medium	Yes	High	High Computing Power Wastage
PoET	Consortium & private	Permissioned & permissionless	Medium	Yes	Medium	Dependent on Intel’s SGX
PoS (Search)	Private	Permissioned	Low	Plausible	High	Dependent on resource provision
PoAh	Public	Permissioned & permissionless	High	Yes	High	Low computation need when implemented with fog and edge computing
PoP	Public	Permissionless	High	Plausible	High	Requires further research
PoS (Stake), LPoS, dPos	Private	Permissioned	Low	Medium to High	Plausible	Requires further research
PoI	Public	Permissionless	High	Plausible	Medium	Requires further improvements
PoB	Public	Permissionless	High	No	Low	Requires monetary value
PoC	Private	Permissioned	Medium	No	Medium	Uses Storage as mining rights
PoA (Activity)	Public	Permissionless	High	No	Low	Can experience high levels of Delay
PoW (Weight)	Consortium & public	Permissioned & permissionless	Medium	Plausible	Low	Requires monetary values
Casper	Consortium & public	Permissioned & permissionless	High	No	Medium	Unable to meet IoT requirements
PoL	Public	Permissionless	High	No	Medium	Efficiency not high enough for IoT