> For the complete documentation index, see [llms.txt](https://hub.bsvblockchain.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hub.bsvblockchain.org/higher-learning/bsv-academy/bsv-theory/reclaiming-disk-space/spent-transactions.md). # Spent Transactions > 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 ![](/files/c0Uz6tam9s5RH211kvBI) When a UTXO is created in a transaction, the outputs that were spent as inputs to the transaction are consumed by the action, and cease to exist as live spendable tokens on the network. Once the transaction has been ‘mined’ into a block which the network has then expended work building upon, it can be said that the transaction record is immutable. This means that anyone with a copy of the transaction can prove that the transaction was created before the block timestamp. Once the spent outputs from old transactions, that are referred to in the new transaction's inputs, have been made immutable, nodes are free to remove them from their copy of the block chain. They are not required for the process of creating new blocks and consume hard disk storage space. At this point, it becomes the responsibility of the people who made the transactions to keep their own copies of them. This can be managed through archive services, private storage and more. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://hub.bsvblockchain.org/higher-learning/bsv-academy/bsv-theory/reclaiming-disk-space/spent-transactions.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.