That's a kind of ledger that records and verifies Nbt Cryptocurrency Ethereum Business Insider made on it. Or you can use a computer to "mine" for ...
source https://www.google.com/url?rct=j&sa=t&url=http://gruppoautismobelluno.org/computer-profit/nbt-cryptocurrency-ethereum-business-insider/&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNFl_MlcEYPCDGjmJEQYq_NBYaMkfw