Which, of course, wouldn't change a thing: it would just cause gold deflation instead of fiat currency inflation, since the supply of gold is limited. Therefore, if you force the government to only be able to deal in how much gold it has, as the economy expands, each individual piece will be worth more and more, untill we get ridiculous things like issuing certificates for micrograms of gold. Naturally, nobody would deal in actual gold, since that's horribly unwieldy.I think the idea is that there will be no national paper currency. The government would make payments in gold or gold certificates, and would be constitutionally prevented from issuing more certificates than it has gold, or lending gold that has had certificates issued against it.
This already happens. Banks issue bonds, stocks and other financial instruments which are money but not currency. What's so revolutionary here? The prevalence of convoluted, triple-removed financial instruments is part of the problem.The government would also collect taxes in the form of gold or its own gold certificates. Banks could try to issue their own paper money, but you couldn't pay your taxes with it.
That does not automatically follow. The bank with a horrible reserve ratio would be able to leverage its gold more, give out more credit and thus get awesome financial results, especially with some creative accounting. Throw in some slick marketing and it wouldn't have a problem getting more deposits or selling financial instruments. So what if it collapses later? Furthermore, do they really expect, say, a small shopkeeper to keep tabs on eighty different banks to figure out if he should accept a customer's promissory note or not?So you could put your gold in a bank that has a horrible reserve ratio, but unless they really trust that bank, no one would accept its notes.

Dealing purely in gold is a horrible idea, even more retarded than "the gold standard will fix everything!" idiocy. Gold currency can be messed with like any other, it pulls gold away from important industrial applications to pointlessly serve as a mean of exchange and of course ties the money supply to a limited resource.Of course, you could issue counterfeit U.S. gold certificates, but I would assume law enforcement would work against that. If he's serious about law enforcement only preventing the use of force, then I suppose he wouldn't even bother with the certificates, and just have the government deal in gold. Of course, you can shave, debase, and otherwise pass off a nonstandard coin as a U.S. gold coin.