$ETH Ether, like other cryptocurrencies, uses a shared digital ledger where all transactions are recorded. It is publicly accessible, completely transparent, and very difficult to modify afterwards.

This 'digital ledger' is called blockchain, and it is built through the process of data mining.

Miners are responsible for verifying groups of ether transactions to form "blocks" and encoding them by solving complex algorithms. These algorithms can be more or less difficult, as a way to maintain a certain consistency in the processing time of the blocks (around one every 14 seconds).