Right now Bitcoin blockchain is congested with slow transactions and the fees are rising by hour. So, the Lightchain technology comes to the rescue. This double-layer blockchain aims to resolve this issues by implementing one master chain together with several sub-chains. The prime chain, like Bitcoin, will provide transparency and the overall control, while sub-chains resolve the transactions and synchronize the results on regular basis to the master chain. The developers promise the speeds up to 100 000 transactions per second with maintaining the current tamper-proof qualities of the blockchain.
This effect is achieved by implementation of “Proof of Machine” concept and using an in-memory database cache on the sub-chains. The in-memory cache reduces the time needed to fetch frequently used data, thus increasing total operating speed. The whitepaper goes on to explain, that there will be only one prime-chain, or mother chain, to provide decentralized distributed network that is immutable and transparent to public, while the number of sub-chains can be extended when necessary to increase performance.
This concept is one among many others promising to solve the existing Bitcoin blockchain problems. SegWit, Lightning Network, Schnorr signatures all devise their own way around the issues, and now Lightchain comes forward to expand the amount of possible solutions.