> For the complete documentation index, see [llms.txt](https://docs.onchainden.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.onchainden.com/signing-and-executing/simulation.md).

# Simulation

Den lets you simulate transactions, so you can be confident in the outcome before you execute. Simulations show you if a transaction succeeds, how state changes, and what event logs are emitted.

<figure><img src="/files/tSvijmEPBUezqexJ7VoP" alt=""><figcaption></figcaption></figure>