# Spent Transactions

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<figure><img src="/files/lqFPcATBYplX5fde9pdo" alt=""><figcaption></figcaption></figure>

*Once the latest transaction in a coin is buried under enough blocks, the spent transactions before it can be discarded to save disk space.*

Satoshi Nakamoto, Bitcoin Whitepaper

A **spent transaction** refers to a transaction in which the **outputs have been utilized as inputs** in a subsequent transaction, effectively consuming the tokens involved.

This **immutability is crucial**; once a transaction is confirmed and included in a block, it cannot be altered or removed. The **responsibility for retaining records** of these spent transactions **shifts to the individuals who initiated them**, who may choose to store them through various means such as **archive services or private storage solutions**.


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