[jcranmer]

Well, Tether periodically breaks down their assets a little more, so we know that on December 31, 2021, Tether held ~$5 billion in cryptocurrency. Given that at the same time, Tether had just ~$140 million excess assets over liabilities, we can already conclude that Tether is probably insolvent solely from the subsequent rout in cryptocurrencies.

My suspicion is that a large fraction of Tether's claimed assets aren't valuable at anywhere near Tether's claimed value, and so Tether has actually been insolvent for years, and this is the main fuel for their reluctance to be precise in what their asset pool looks like.