I'm an unfunded searcher, and about a third of the time I work with an intermediary I have to navigate the Proof of Funds conversation.  Currently, this is only time consuming as I'm able to explain my way around it.  However, I expect it will be a roadblock at some point in the future and would like documentation of some sort on hand to keep things moving quickly. 

Is there a standard document unfunded searchers use for these situations? 

Thanks in advance for any ideas/suggestions.