UI is the point when interactions between machines and people happen. It lays down the parameters of a user's interaction with a machine.
Ad Hoc
a Latin expression that means "for this purpose" or "specifically for this" in contemporary English.
Coin
Cryptocurrencies known as coins run on separate blockchains and are unrelated to other coins. Such a cryptocurrency's single unit is also known as a coin.
Mainnet
A mainnet is a separate blockchain that operates on its own network using its own protocol and technologies.