A Bitcoin basic: Bitcoin’s smallest unit
Bitcoin transaction fees are usually expressed in sat/vB, meaning how many satoshis are paid per virtual byte.
The smallest unit used for accounting on the Bitcoin blockchain is 1 satoshi. On the Lightning Network, accounting can go down to one-thousandth of a satoshi.
$BTC You don’t have to buy a whole bitcoin at once; you can trade as little as 0.001 bitcoin, or even less.

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