To sum it up briefly, Particl is a privacy-focused blockchain/P2P hybrid ecosystem that will host a decentralized and anonymous marketplace as well as an array of Dapps using a native cryptocurrency. 

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Particl is the successor of the ShadowProject (https://shadowproject.io/en), a privacy-focused cryptocurrency project started back in August 2014. The team behind this project are known for being innovators in the cryptocurrency scene, being the first to produce many feats such as an HTML5 wallet, a staking mobile wallet with encrypted messaging and transactions, as well as having the first ring signature and HD wallet implementation on BTC codebase. Their Umbra graphical wallet, built using HTML5, is widely known in the “altcoin” community for being absolutely gorgeous and very user-friendly.