Glossary
Bitcoin
Open, borderless digital money with a fixed supply of 21 million.
Blockchain
A public ledger of transactions grouped into blocks and chained with proof-of-work.
Wallet
Software or hardware that stores your private keys and signs transactions.
Private key
Secret value controlling your coins. Never share it.
Seed phrase
12–24 words that recreate your private keys. Back up offline.
Address
Public identifier to receive funds. It’s safe to share.
Mining
Using energy and hardware to secure the blockchain and add blocks.
Confirmation
Inclusion of a transaction in a block. More confirmations = more finality.
Halving
An event that halves the new coin issuance roughly every four years.
Lightning Network
A network for instant, low-fee Bitcoin payments using channels.
Mempool
Waiting area for unconfirmed transactions before inclusion in a block.
Satoshi (sat)
The smallest unit of bitcoin.