This is better! But a couple issues. One, this means the U.S. Treasury has an open book into your in and outflows. Not sure that's Tether's vibe. Two, you've limited yourself to people who can transfer Treasuries. Given Tether doesn't provide consumer redemption, this isn't a huge issue. But transferring Treasuries takes more financial savvy than wiring cash, and that savvy is likely to ask for their interest (as is common in collateral arrangements).