Documentation of the protocol, and the JS API, is in https://github.com/mozilla/hawk/blob/main/API.md.
This was once hueniverse/hawk and relased as hawk.
Then, after the 7.0.10 release, it was moved to the hapijs/hawk repository and released as @hapi/hawk.
Hapi later de-supported the library, after releasing version 8.0.0.
It has since been moved to mozilla/hawk and is again released as hawk.
All of the intermediate versions are also released as hawk.
Changes are represented in the main branch on this repository.
Mozilla claims in mozilla/hawk they maintain (i.e. stating "maintenance mode") and yet the sole maintainer declares in an issue they are not affiliated with Mozilla and makes the statement that the repository is likely abandoned.
Mozilla maintains several Hawk implementations in different languages.
This library is in "security maintenance mode" -- no features will be added, no functionality fixes will be considered, and only security-related bugfixes will be applied.