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.

Bitcoin Halving

A blockchain event known as a "halvening" (or "Bitcoin halving") causes block subsidies or rewards for validating transactions to be reduced by half.
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Altcoin

Altcoin is the term given to describe alternative digital assets, such as a coin or token that is not Bitcoin. This nomenclature comes from the idea that Bitcoin is the original cryptocurrency and that all others are then considered “alternate” or “alternative” coins.
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Testnet

An alternative blockchain used by developers for testing.
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