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.
Contentos is a decentralized global content ecosystem invested by Binance Labs (the blockchain incubator of world’s largest exchange, https://labs.binance.com), DHVC and various class-leading funds. Contentos TestNet was launched and its real-time network status can be viewed on Contentos Block Explorer (https://explorer.contentos.io). It aims to create a decentralized content ecosystem, where assets can be freely produced, authenticated, and distributed. The team consists of experts from the content industry, who have worked on top-tier consumer applications and blockchain projects. Contentos is not only a blueprint for what digital content ecosystem might look like in the future but we have multiple working use cases: Contentos is working with strategic partners, LiveMe and Cheetah Mobile, that have amassed over 60+ million monthly active users. With real-time user feedback, Contentos will become a premier blockchain project as it places the interest of users first.