> For the complete documentation index, see [llms.txt](https://docs.safestake.xyz/safestake-overview/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.safestake.xyz/safestake-overview/docs/safestake-license-attribution.md).

# Attribution Notice

Safestake implements its operator software based on [Hotstuff](https://github.com/asonnino/hotstuff) and [Lighthouse validator client](https://github.com/sigp/lighthouse/tree/stable/validator_client).

## Hotstuff

Our code under the `hotstuff` directory is mostly taken from the [Hotstuff](https://github.com/asonnino/hotstuff) repository, with the following modification:

* Upgrade to support port reuse for multiple committees (VAs)
* Optimize recovery and syncrhonization mechanisms after node crash and reboot

## Lighthouse

Our operator is a modified decentralized version of Lighhouse's validator client. It reuses most of Lighthouse's VA logics, including:

* Duty retrieval and execution
* Slashing protection

The most important updates we make are:

* Update the signing method to include an option to sign distributely among a committee of operators
* Update the VA load and save logics to handle operators instead of complete validators.