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The Three Cards
Card#1: PoW (Proof of Work)
The concept was invented by Moni Naor and Cynthia Dwork in 1993 as a way to deter denial-of-service attacks and other service abuses by requiring some work from a service requester.
Card#2: 2FA (Two-factor Authentication)
A secure approach to idenfify and access management that requires two forms of authentication to access resources and data.
Card#3: DePIN (Decentralized Physical Infrastructure Networks)
It uses blockchain and Token rewards to develop physical infrastructure in the real world, covering areas such as transportation, energy, and wireless connectivity.