Definition

La blockchain est une technologie de stockage et de transmission d’informations, transparente, sécurisée, et fonctionnant sans organe central de contrôle (définition de Blockchain France).

how it works?

any public blockchain works with a programable currency or token.

transactions are grouped into blocks before they are added to a blóckchain.

They are practically immutable since if one wanted to alter the information in them, it would require gigantic computing power.

They tend to be transparent because anyone can see the data there.

They tend to be decentralized, which means there is no authority behind them.

Types of blockchains:

public blockchain an private blockchain.