# hashx

The `hashx` algorithm uses [HashX](https://github.com/tevador/hashx), a proof of work function that resists GPU and ASIC optimization.
It uses the Rust [`hashx`](https://docs.rs/hashx/latest/hashx/index.html) crate.

```yaml
thresholds:
  - name: moderate-suspicion
    expression:
      all:
        - weight >= 10
        - weight < 20
    action: CHALLENGE
    challenge:
      algorithm: hashx
      difficulty: 16
```

See [thresholds](/docs/configuration/thresholds.md) for rules based on request weight.