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.
Airdrop
A marketing tactic known as a cryptocurrency airdrop involves giving away free tokens or coins to existing owners of a specific coin or token.
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
Accountability
Accountability is the need or willingness to take ownership of one's actions. When someone takes ownership, they are committing to producing successful outcomes.