Litecoin

https://litecoin.com/en/

Testnet:
http://testnet.litecointools.com/

Mimble wimble:
https://github.com/litecoin-project/lips/blob/master/lip-0003.mediawiki

https://litecoin.com/en/news/litecoin-mimblewimble-october-update

Alza článek – česky:
https://www.alza.cz/litecoin