Jack Mallers, Litecoin team developer, sent 0.01 Litecoin to Charlie Lee using Lighning Network. He hadn't pay any fees.
— Charlie Lee (@SatoshiLite) 1 сентября 2017 г.
What is Lighning Network?
The Lightning Network is a P2P system for making micropayments of digital currencies such as Bitcoin, Litecoin, or Vertcoin through a mesh network of bidirectional payment channels without delegating custody of funds or trust to third parties.
Normal use of the Lightning Network consists of opening a payment channel by committing a funding transaction to the relevant blockchain, followed by making any number of Lightning transactions that update the tentative distribution of the channel's funds without broadcasting to the blockchain, followed by closing the payment channel by broadcasting the final version of the transaction to distribute the channel's funds.
The spec for using the Lightning Network relies on Segregated Witness (SegWit), a feature that has been enabled for the mainnet (production) Bitcoin, Litecoin, and Vertcoinblockchains.