UTXO Explained
📖 5 min read
Quick Answer
比特幣不會像銀行帳戶那樣將您的餘額儲存為單一數字。相反，它追蹤稱為 UTXO 的單一價值區塊。一旦你將比特幣視為數位現金而不是銀行餘額，費用、找零和隱私就會突然變得有意義。
💡 Think of it as…
The coins and bills in your physical wallet. You do not have a "balance" — you have a 5, a 10 and two 1s. To pay, you combine specific notes and receive change. Your Bitcoin balance is just the sum of all your unspent notes.
What UTXO means
UTXO stands for Unspent Transaction Output — a discrete amount of Bitcoin locked to your key that you have received but not yet spent. Your wallet balance is simply the total of all your UTXOs.
Spending and change
When you pay, you spend whole UTXOs as inputs. If they exceed the amount needed, the wallet sends the remainder back to you as a new "change" UTXO — exactly like getting change from a cash payment.
Why it matters
The UTXO model makes verification fast and parallel, and it shapes fees (more inputs = bigger, costlier transactions) and privacy (each UTXO has a traceable history). Good wallets manage your UTXOs for you.
🔑 Key takeaway
比特幣追蹤未花費的區塊（UTXO），而不是帳戶餘額。它的行為就像現金：你花整塊錢就能拿到零錢。
Why this matters for you
Knowing this helps you understand why consolidating small amounts during low-fee periods saves money later — useful for anyone stacking sats regularly through DCA across Asian exchanges.
常见问题
Why is my wallet balance correct if there is no "balance"?▼
Your wallet scans the blockchain for every UTXO locked to your keys and adds them up. The single number you see is calculated, not stored.
What are "dust" UTXOs?▼
Tiny UTXOs so small that spending them would cost more in fees than they are worth. Wallets sometimes flag or avoid them.
其他區塊鏈是否使用 UTXO？▼
Some do (like Litecoin), while others such as Ethereum use an account-balance model. Each approach has trade-offs in speed, privacy and flexibility.