Research on IoT Forensics System Based on Blockchain Technology

Table 3

Comparison of PoW, PoS, DpoS, and PBFT consensus mechanisms.

Parameter	PoW [38]	PoS [39]	DPoS [40]	PBFT [41]
Degree of centralization	Fully decentralized	Fully decentralized	Partially decentralized	Partially decentralized
Node access license	Not needed	Not needed	Not needed	Needed
Number of access nodes	Unlimited	Unlimited	Unlimited	Limited
Block time	Longer	Longer	Shorter	Shorter
Main resource occupation	Computing power	Equity, token	Equity, token	Bandwidth
Application scenario	Public chain	Public chain	Public chain	Alliance chain
Whether to fork	Easy to fork	Easy to fork	Not easy to fork	No fork
Final consistency	No finality	No finality	No finality	Finality
Security guarantee	More than 1/2 of computing power is credible	More than 1/2 stake is credible	More than 1/2 of equity is credible	More than 2/3 of nodes are trusted