How do I permanently delete cash?

Excuse me, I'm a bit confused by your question. Are you referring to digital currency or physical cash? It's important to note that permanently deleting cash, especially physical cash, isn't something that's typically done. If you're looking to dispose of physical cash, it's generally recommended to spend it, donate it, or deposit it into a bank account. However, if you're asking about digital currency, such as cryptocurrency, the process for "deleting" or removing it from existence can be more complex. It's worth noting that cryptocurrency is decentralized and not controlled by any single entity, so there's no central authority that can permanently delete it. That being said, if you want to ensure that your cryptocurrency can't be accessed or used, you can send it to a wallet address that you don't have the private key for, effectively "burning" or "losing" the coins. But keep in mind that this is a permanent and irreversible action, and you should be absolutely sure before taking this step. Is there a specific reason why you're looking to permanently delete cash or cryptocurrency? If so, perhaps I can provide more tailored advice based on your situation.