Grin coin is a private & lightweight open source project based on the mimblewimble blockchain implementation. MimbleWimble is a lightweight blockchain protocol proposed by anonymous author that goes by the name Tom Elvis Jedusor (inspired by Harry Potter) in July 2016. Since then, the proposal has gained a huge following among Bitcoin and privacy advocates. Unlike bitcoin or ethereum, there are no addresses in Grin. In order to transact using Grin, both wallets must communicate with each other online with the results broadcasted to the network. Another key different is that transaction history (sender, receiver, amount) will not be recorded on the blockchain. Due to the removal of these information from the transaction, the data size remains small and that keeps the blockchain lightweight. New nodes can easily join the network without having to download a large blockchain. Grin coin was launched without an ICO, fundraising, or pre-mine. Developers around the world contribute openly with the goal to ensure the coin distribution remains as fair as possible. There are 2 popular wallets widely available to interact with the Grin network. Grin core wallet: https://www.coingecko.com/buzz/how-to-use-grin-wallet-to-send-receive-grin-coins Wallet713: https://www.coingecko.com/buzz/how-to-use-grin-wallet713-to-send-and-receive-grin-coin-step-by-step-guide The consensus algorithm used by Grin is the Cuckoo Cycle proof-of-work based. There are 2 hashing algorithms involved with Grin. Cuckoo-29 is meant for GPU mining while Cuckoo-31 is meant fo ASIC mining. This is a deliberate design to encourage miners to eventually move into ASIC mining for efficiency while keeping it fair at the beginning of the launch. Grin coin has launched its mainnet on 15th January 2019 and is now available for mining and trading.
'Developed by Luxcore, LUX (LUX Coin) is a hybrid cryptocurrency utilizing both proof-of-stake and proof-of-work algorithms to enhance blockchain security and decentralization. Luxcore's hybrid consensus model imploys masternodes to provide specialized functions and further secure the chain while providing additional rewards to coin holders. The LUX blockchain enables developers to utilize smart contracts and decentralized applications. Luxcore continues to develop products for the LUX blockchain including Luxgate (a truly trustless, peer to peer decentralized exchange) and Luxedge (a decentralized software development platform and repository). LUX was created in 2017 as a fork of the Bitcoin codebase, but it has grown to not only keep up with new technologies in the cryptocurrency space, but has aimed to introduce new innovations and services to the broader crypto community with cross-chain and decentralized solutions.'