plonky2 is an implementation of recursive arguments based on Plonk and FRI. It is the successor of [plonky](https://github.com/mir-protocol/plonky), which was based on Plonk and Halo.
plonky2 is largely focused on recursion performance. We use custom gates to mitigate the bottlenecks of FRI verification, such as hashing and interpolation. We also encode witness data in a ~64 bit field, so field operations take just a few cycles. We use an extension field to boost soundness when needed.