Awesome
Biscuit 
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This is the repository for a collection of haskell libraries providing support for the Biscuit auth toolkit, created by Geoffroy Couprie.
You will find below the main lib and its companions:
- biscuit — Main library, providing minting and signature verification of biscuit tokens, as well as a datalog engine allowing to compute the validity of a token in a given context
- biscuit-servant — Servant combinators, for a smooth integration in your API
Supported biscuit versions
The core library supports v3 and v4 biscuits (both open and sealed).