A UTXO (Unspent Transaction Output) is a discrete piece of Bitcoin that you have received but not yet spent. Your wallet balance is the sum of all UTXOs you control.
Master the Pooled UTXO Model
Understand how Bitcoin pools UTXOs for lower fees and stronger privacy.
Read the Guide Bitcoin UTXO: the discrete unit of spendable BTC on the blockchain. |  Bitcoin UTXO: the discrete unit of spendable BTC on the blockchain. |  Bitcoin UTXO: the discrete unit of spendable BTC on the blockchain. |  Bitcoin UTXO: the discrete unit of spendable BTC on the blockchain. |
What Is the Pooled UTXO Model?
BITCOIN FUNDAMENTALS
The Pooled UTXO Model is a privacy and fee-optimisation practice that groups multiple users' Bitcoin UTXOs into a single collective on-chain transaction. By sharing transaction overhead across many participants, each user pays a fraction of the normal miner fee while simultaneously breaking the on-chain ownership links that chain-analysis tools depend on.
21M BTC CAP | UTXO MODEL | COINJOIN PRIVACY |
Key UTXO Concepts
LEARN THE ESSENTIALS
The UTXO model ensures that each piece of bitcoin can only be spent once, cryptographically sealed to its owner's public key. Every full node maintains a live UTXO set — a compact database of all spendable outputs — enabling instant double-spend detection without scanning the full blockchain history.
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The Pooled UTXO Model in Action
HOW IT WORKS
In a CoinJoin transaction, multiple users each provide UTXOs as inputs and receive equal-denomination outputs. A single transaction is assembled, signed by all parties, and broadcast — no coordinator can steal funds, and no observer can determine which input paid which output.
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What is a UTXO?
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How does pooling reduce fees?
By combining many inputs into one transaction, participants share the fixed transaction overhead. Each user's fee share drops proportionally, delivering savings of 50–80 percent in high-fee periods.
UTXO Privacy Tools
SELF-CUSTODY
Modern self-custody wallets including Sparrow Wallet, Wasabi Wallet, and Trezor Suite expose full coin-control interfaces. You can select exactly which UTXOs to include in each transaction, label inputs by source, and initiate CoinJoin rounds with a single click.
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Explore UTXO Topics
IN-DEPTH GUIDES
What Is UTXO?
Bitcoin Fundamentals
Learn how UTXOs work as the core accounting unit in Bitcoin — discrete spendable outputs that replace traditional account balances.
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UTXO Pooling
Group UTXOs Together
Discover how pooling multiple UTXOs reduces miner fees and strengthens on-chain privacy through collective transactions.
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UTXO Management
Optimise Your Wallet
A practical guide to coin control, UTXO consolidation, and handling dust to keep your Bitcoin wallet efficient.
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UTXO Privacy
Protect Your Identity
Learn how address reuse and UTXO merging expose your financial history, and how to defend against chain analysis.
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Extended UTXO
EUTXO Explained
Explore how Cardano's Extended UTXO model adds smart-contract programmability while preserving UTXO's core strengths.
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CoinJoin Guide
Trustless Privacy
A complete guide to CoinJoin — from basic mechanics to advanced Whirlpool remixing — for self-custody Bitcoin users.
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