Bitcoin Confidential is a new coin focused on confidentiality/privacy that will be Proof of Stake, using Ring Confidential Signatures and based on the latest Bitcoin codebase for compatibility.
ChainX aims to facilitate asset interoperability with other blockchains It measures users' mining power based on the market value of BTC, DOT, ETH, ERC20, EOS and other assets that are deposited in an inter-chain bridge.