[Retracted] Healthcare and Fitness Data Management Using the IoT-Based Blockchain Platform

Table 2

Comparison between PoW and PoA properties.

	PoA	PoW
Permissioned blockchains	Yes	No
Private	Yes	No
Energy consumption	Low	High
High processing power needed to create blocks	No	Yes
Risk of 51% attack: network takeover	Low	High
Trust-free	No	Yes
Transaction time	Fast	Slow