Verification Code

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.

Falling Knife

The term falling knife (also known as "Catching a Falling Knife" or "Catching the Bottoms") refers to the action of buying an asset which is rapidly declining in price.
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Testnet

An alternative blockchain used by developers for testing.
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Node

An essential component of a blockchain infrastructure, a node stores data and allows all communication (transactions) to pass through it.
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