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We have enough control over the execution environment in a Sprite (unlike a Fly Machine, where the implied Linux contract we have with our users gets in the way) that we can trivially hide explicit proxies.

We can also attach Macaroons to Fly Machines and Sprites for configurable ambient privileges, something I've wanted us to expose as a feature for a very long time.

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Awesome, i look forward to that. I think that could be a major differentiator for sprites. I wish i could work on that problem at fly.io scale.

What is the contract with sprites? Is it just built-with-linux but not promising Linux? Or is it more like a machine but y'all control the container image?

There's no "formal" contract in either place but people running on Fly Machines expect that there's nothing at all between them and the kernel, and we don't have that expectation in Sprites; we can do whatever we want. :)

I don't want to get too far into the rest of the details only because I'm writing this up for next week. They're not that interesting technically, but they're a really big deal for us in other ways.

Great, i look forward to reading it.

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