Just found Cryptonite (XCN). The coin seems to follow an unique approach with a "mini-blockchain" and should be an original scalability solution. The concept is a little bit similar to Ardor, but it was conceived already in 2013 and started in 2014 ...

It's on Rank 482 (!) on Coinmarketcap ... It seems it had a bubble in mid-2017 that has brutally deflated. I look if I can investigate the reasons ...