Path

What Is a ‘UTXO’ and How Does It Relate to Transaction Validity?

A UTXO is an unspent output from a previous transaction; a transaction is valid only if it spends existing UTXOs with a correct signature.
Greeks.live05.12.25

What Is a ‘UTXO’ and How Does It Relate to Transaction Validity?

UTXO stands for Unspent Transaction Output. It is the fundamental way Bitcoin tracks ownership.

Every Bitcoin transaction consumes one or more existing UTXOs and creates new UTXOs as outputs. A transaction is only valid if the inputs it references are indeed unspent and the user attempting to spend them can prove ownership via a digital signature.

What Is the Purpose of the “Change Output” in a Standard Bitcoin Transaction?
Does an Unspent Transaction Output (UTXO) Still Pose a Preimage Risk?
What Is a UTXO and How Does It Relate to Transaction Verification?
How Does the Concept of “Change” Relate to UTXO Transaction Structure?
What Is a UTXO and How Does It Relate to Signing a Transaction?
What Is the Role of UTXOs (Unspent Transaction Outputs) in the SegWit Transaction Model?
What Determines If a Transaction Is ‘Valid’ for Entry into the Mempool?
What Is an Unspent Transaction Output (UTXO) in the Context of Bitcoin?

Glossar

Utxo Model

Architecture ⎊ The Unspent Transaction Output (UTXO) model represents a distinct approach to tracking cryptocurrency ownership, differing fundamentally from account-based systems.

UTXO

Model ⎊ UTXO, or Unspent Transaction Output, represents the accounting model used by Bitcoin and other similar blockchains.

About

Contact

Editorial Policy

Terms of Service

Privacy Policy

Cookie Policy

© 2026 Greeks.live

All Rights Reserved

Greeks.live RFQ

Build by Noo on Engine