Nonce
A number used once, which miners search for when mining a block in Proof-of-Work networks; also a counter that prevents a transaction from being replayed on an account.
See also
Layer 2
A secondary protocol built on top of a base blockchain (Layer 1) that speeds up transactions and lowers fees by moving some computation off the main network.
Bridge
A protocol that allows assets and data to move between different blockchains that are not natively compatible with one another.
DAO
Decentralized Autonomous Organization — a community that makes decisions through token-holder voting, with its rules encoded in smart contracts.
Block explorer
A web service that lets you browse blocks, transactions, and addresses on a blockchain in real time (for example, Etherscan for Ethereum).
Satoshi
The smallest unit of Bitcoin, equal to one hundred-millionth (0.00000001) of a BTC. Named after Bitcoin's creator.
Fiat
Traditional government-issued currency not backed by a physical commodity, such as the US dollar, euro, or Czech koruna — as opposed to cryptocurrency.