The outsourcing protocol
------------------------

TODO: I should describe exactly what happens in the protocol.

This is mostly modelled on [Plonky2](https://github.com/0xPolygonZero/plonky2), 
which in turn is essentially the same as

- E. Ben-Sasson, L. Goldberg, S. Kopparty, and S. Saraf: _"DEEP-FRI: Sampling outside the box improves soundness"_