  In this dissertation project, we describe and implement a practical system
application based on a selective disclosure credential scheme, namely the
Coconut credential scheme\cite{sonnino_coconut:_2018}. The specific application
here is an electronic petition system with the distinctive added feature of
unlinkability as well as anonymity: such that no information about the
anonymous petition voter is linkable back to the individual. In other words,
there is no data leaked about who voted in the petition, just that the users
who did, were indeed eligible and authorized to vote. As for the
implementation, the client-side is done using JavaScript so that the client can
trustlessly compute the cryptographic constructions individually, whereas the
server-side is done using Node.js, but can easily be replaced by a more
sophisticated and secure structure such as a permissionless blockchain
platform.
