Pieces, change and balances

Bitcoin doesn't keep a balance for you the way a bank does. It keeps separate pieces, called unspent outputs or UTXOs: each payment you receive is its own piece, waiting to be spent. Your balance is just all your pieces added up.

At block 972,307, on 20 October 2026, the chain held 164,598,023 unspent outputs holding 20,100,732 bitcoin between them. Every bitcoin that can still be spent sits in one of them.

Spending whole pieces, getting change

A piece can't be cut in place. To pay someone, your wallet spends whole pieces and creates new ones: one for the person you are paying and, usually, one back to you with what is left over, minus the fee. That second one is the change. It works like paying for a $3 coffee with a $10 note.

Step	What happens
You hold	One piece of 0.5 BTC
You pay	0.1 BTC to a shop
The transaction creates	0.1 BTC for the shop, and about 0.4 BTC back to you as change
The fee	Whatever is left between the two, taken by the miner

Most wallets send the change to a brand-new address of yours, not back to the one it came from. That is why a transaction often shows an address you don't recognize: it is your own wallet's.

How this shows up when you look up an address: change outputs and where a balance sits on satoshis.watch.

Why an address can show zero

If you look up an address you were paid at, after you have spent from it, it often shows zero. The coins didn't vanish: the payment moved them on, and the change went to your wallet's new address. Your wallet adds up all its addresses, which is why it still shows the right total. An address that shows zero can still receive again.

Dust

A piece so small that the fee to spend it would be more than it holds is called dust. It still belongs to whoever holds the key; it just isn't worth moving on its own. Bitcoin Core, the most widely run Bitcoin software, generally won't pass along new payments that create pieces below 546 satoshis for a 1 address or 294 for a bc1q address.

Sometimes strangers send tiny amounts to many addresses at once. Spending such a piece together with your own coins can link them in the public record, which is why some wallets let you leave chosen pieces untouched. See what the chain shows about you.

How this shows up when you look up an address: small outputs, also called dust on satoshis.watch.

Live from the chain

An address made of many small piecesLoading live figures…

Holds

…

Payments received

…

Separate pieces

…unspent outputs

The address of the first block's reward has received tens of thousands of small tribute payments. It has never spent any of them, so each one is still a separate piece.

See it on satoshis.watch →