From your reddit posting;
Users deposit bitcoins and other crypto assets by means of an audited gateway or pegging mechanism.
It seems your plan requires auditing too.
There's a substantial difference between some fallible humans giving a "trust us, it's secure!" stamp of approval (what the OP is asking for), and a cryptographic receipt that can be automatically checked by your client to provide up-to-the-minute assurances of solvency (what I'm talking about in the reddit thread).