> For the complete documentation index, see [llms.txt](https://docs.nubit.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nubit.org/utxo-bundling/introduction/traditional-limitation-one-transaction-at-a-time.md).

# Traditional Limitation: One Transaction at a Time

Bitcoin tracks ownership through individual transaction outputs (UTXOs). If you want to spend 1 BTC and only have smaller UTXOs, they must be merged into a single transaction, an onchain process that:

* Increases transaction size
* Raise network fees
* Delays confirmation

For high-volume applications and users, like merchants, payment processors, or applications, this creates serious friction.

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