Hash rate
The total computational power directed at mining a proof-of-work blockchain, measured in hashes per second. Bitcoin's current hash rate is ~655 exahashes per second…
Glossary
Glossary — crypto terms, defined
80 articles · refreshed Jun 10, 2026
Halving
Bitcoin's block subsidy is cut in half every 210,000 blocks (~four years). The latest halving (April 2024) reduced the per-block reward from 6.25 BTC…
Gwei
A denomination of ETH equal to one billionth of an ETH (10^-9). Gas prices on Ethereum are quoted in gwei. At 30 gwei gas…
Genesis block
The first block in a blockchain. Bitcoin's genesis block (block 0) was mined by Satoshi Nakamoto on Jan 3, 2009; it contains a Times…
Gas
The unit of computational work on Ethereum and Ethereum-compatible chains. Each operation (storage write, computation, transfer) costs a certain amount of gas. The user…
FUD
Fear, Uncertainty, Doubt — pejorative shorthand for negative coverage or commentary, often used by holders to dismiss legitimate criticism. The term has lost meaning…
Fork
A divergence in a blockchain's history, creating two separate chains. Soft forks are backward-compatible; hard forks create two permanently separate chains (Bitcoin Cash split…
Fiat
Government-issued currency (USD, EUR, GBP). "Fiat" comes from the Latin for "let it be done" — fiat currency has value because the issuing government…
Fear and Greed Index
A composite sentiment score from 0 (extreme fear) to 100 (extreme greed), published daily by Alternative.me. Inputs include price volatility, momentum, social media activity,…
ETF
Exchange-Traded Fund — a registered investment vehicle that holds an underlying asset and trades on traditional stock exchanges. Spot Bitcoin ETFs (approved Jan 2024)…