Bitcoin Days Destroyed is a network activity metric that takes into account not only the volume of coins moved but also the time they spent idle. It helps assess the movement of "old" coins.

Simplified Payment Verification (SPV) is a method of verifying transactions on a blockchain without downloading the entire chain of blocks. Block headers are enough, which makes the technology the foundation of lightweight crypto wallets.

The flippening is a hypothetical moment when Ethereum overtakes bitcoin in market capitalization and becomes the number one cryptocurrency. The reverse scenario is jokingly called the floppening.

A satoshi is the smallest unit of bitcoin, equal to one hundred-millionth of a coin. Fractional units make it possible to make very small payments and to specify amounts precisely.

Satoshi Nakamoto is the name under which bitcoin and its technical document were introduced. To this day it is unknown whether a single person or a group stands behind this pseudonym.