In order to confirm the identity of the person entering an account, a verification code is given to a different device. It's used for two-factor authentication.
Hard Cap
A hard cap is a restriction put in place by the blockchain's code on the maximum amount of units that can ever be created or circulated for a specific cryptocurrency
Off-Chain
All network users can see on-chain transactions because they are recorded on the distributed ledger. Off-chain transactions, however, take place away from the blockchain network
Ad Hoc
a Latin expression that means "for this purpose" or "specifically for this" in contemporary English.