Bitcoin-based privacy coin №1: Particl
Particl is an “ open-source and decentralized privacy platform built on the blockchain specifically designed to work with any cryptocurrency ”. The company’s mission is to encourage private and democratic economy supported by its native currency (PART).
This coin provides a great combination of privacy features and speed. Project’s team also has a clear plan on scaling, including utilizing the lightning network, Segwit, and bulletproofs.
The only downside is that top 100 addresses own 53.1% of a total coin’s supply. But to be fair, the true decentralization (or the lack of it) is still the major problem of all cryptos.