Mono has been replaced by it's successor "Aptum", take a look at it in here https://bitcointalk.org/index.php?topic=5149835.60

Whitepaper: https://github.com/aptumproject/papers/blob/master/aptum.pdf
Code: https://github.com/mono-project/papers/

Discord: https://discord.gg/DEYNzDA
Telegram: https://t.me/aptumproject