I get your point about records and demand, and your saying most will use certificates and Electronic Gold :)
From an accounting view, where does the liabilty for Electronic Gold sit, Mint or Treasury, and do coins redeemed show as an asset held against that?
If banks hold the reserves, who validates them independently and how often, GAO or another body, so redemptions don’t jam up when coins leave circulation?
Also, on the $100 vs $90 minting for U.S. vs foreign gold, is that recorded as seigniorage or a production subsidy, and which fund books it, audits' note it anywhere?