KYC/AML is a set of rules under which exchanges and exchange services are obliged to identify customers and counter money laundering. Usually the procedure includes verifying identity by documents.

A withdrawal is the operation of transferring money or cryptocurrency from a platform or service to an external wallet, bank card, or user account, based on a request the user submits specifying the details and amount.

DDoS is a distributed attack in which many devices simultaneously flood a server with requests to overload it and make it unavailable to ordinary users. It is a frequent threat to crypto exchanges and pools.

Double spending is an attempt to spend the same coins twice. This is a key problem of digital money, which the blockchain solves using a distributed ledger and transaction confirmations.

A paper wallet is a way of storing cryptocurrency in which the public address and private key are printed out on paper. It is a form of cold storage that is kept offline, away from the internet.