getReadProof for specific event

Question

I want to generate a StorageProof for a specific event that is stored in storage. I have found System_Events but this returns me all events of a block, instead of a specific one. I stumbled on getChildReadProof and am thinking the childStorageKey could be the index in the Vec<Event> but am unable to generate valid calls, and have the suspicion this is incorrect in general.

Is there another module I'm missing for accessing events and performing a storage proof?

Answer 1

There is currently not efficient way to proof only the existence of one event. So, you need to read all events in the moment.

However there is an issue open to improve the situation: https://github.com/paritytech/substrate/issues/11216