More assertions

[ohaddahan]

I built this tiny program a long time ago, I think you can add its content into lighthouse: https://github.com/ohaddahan/solana-sandwich/tree/master

It can be used by protocols to ensure no one is trying to act malicious, for example reopening an account that the program closed, can be enforced by marking a instruction as nothing is allowed after, thus making it the end of the transaction and removing this potential issue.

[ohaddahan]

A bit more context @Jac0xb , solana-sandwich is more oriented to be used from inside a solana-program to ensure it's not being abused and it's valid only within one transaction.

Hence it's a slightly different approach and issues vs. the existing ones in lightouse which (I think) fits more for cross-transaction issues, such as mev.