# 了解区块链

Blockchains enable us to store information on millions of devices globally. With the right consensus models, naming protocols can avoid the need to trust back-end servers to resolve queries, which helps avoid DNS censorship attacks and ensure that internet users land on the web pages they intended to visit.

## Block

What is a block?

## Block time

It takes on average 10 minutes to mine each Handshake block. With that being said, 1 Handshake block time is = 10 minutes.

## Mining fee

Currently Handshake mining fees are less than a penny.

## Nodes

What are full nodes?

## Keys

What are private and public keys?

## Private Wallet

What's a private wallet and why do they matter?