The Liquid blockchain went live with the first block generated on September 27, 2018 at 1:29 UTC. At launch there were 23 Liquid members, including Altonomy, Atlantic Financial, Bitbank, Bitfinex, Bitmax, BitMEX, Bitso, BTCBOX, BTSE, Buull Exchange, DGroup, Coinone, Crypto Garage, GOPAX (operated by Streami), Korbit, L2B Global, OKCoin, The Rock Trading, SIX Digital Exchange, Unocoin, Xapo, XBTO, and Zaif.
Liquid has a native token called Liquid Bitcoin (L-BTC) which is two-way pegged to Bitcoin (BTC). Upcoming features include a native wallet, and support for Ledger and Trzeor hardware wallets.
Source : Blockstream Blog