UTXO (Unspent Transaction Output)
UTXO (Unspent Transaction Output) is the transaction model used by Bitcoin in which value is tracked as outputs that can be spent once, rather than as
UTXO (Unspent Transaction Output) is the transaction model used by Bitcoin in which value is tracked as outputs that can...
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Sep 2026 · Verheidsscore: 50%
What is UTXO (Unspent Transaction Output)?
UTXO (Unspent Transaction Output) is the transaction model used by Bitcoin in which value is tracked as outputs that can be spent once, rather than as
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When you receive bitcoin, the transaction creates a UTXO assigned to you. Spending selects UTXOs as inputs and creates new UTXOs as outputs (including change). The chain tracks the set of all unspent outputs; a balance is just the UTXOs con
The UTXO model affects privacy (new addresses per transaction recommended), fee calculation (inputs add size), and smart-contract design. It is also the basis for Bitcoin script, Lightning, and "coin control." Understanding UTXOs explains m
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1. What Is a UTXO
A UTXO (Unspent Transaction Output) is an individual unit of cryptocurrency that hasn't been spent — the accounting model used by Bitcoin and many other chains, where balances are the sum of UTXOs owned.
2. How It Works
When you receive bitcoin, the transaction creates a UTXO assigned to you. Spending selects UTXOs as inputs and creates new UTXOs as outputs (including change). The chain tracks the set of all unspent outputs; a balance is just the UTXOs controlled by your keys. This contrasts with Ethereum's account/balance model.
3. Why It Matters
The UTXO model affects privacy (new addresses per transaction recommended), fee calculation (inputs add size), and smart-contract design. It is also the basis for Bitcoin script, Lightning, and "coin control." Understanding UTXOs explains many Bitcoin UX behaviors.
4. Key Facts
- UTXOs are consumed fully when spent (no partial spends)
- Change outputs return leftover value to a new address
- UTXO count affects transaction size and fees
- Ethereum uses an account model instead
5. Related Concepts
- bitcoin
- bitcoin-address
- bitcoin-script
- full-node
Frequently Asked Questions
What is UTXO (Unspent Transaction Output)?
UTXO (Unspent Transaction Output) is the transaction model used by Bitcoin in which value is tracked as outputs that can be spent once, rather than as
How does UTXO (Unspent Transaction Output) work?
A UTXO (Unspent Transaction Output) is an individual unit of cryptocurrency that hasn't been spent — the accounting model used by Bitcoin and many other chains, where balances are the sum of UTXOs owned. When you receive bitcoin, the transaction creates a UTXO assigned to you. Spending selects UTXO
Why does UTXO (Unspent Transaction Output) matter in Web3?
- bitcoin-address - bitcoin-script - full-node