Qtum is a decentralized and open-source smart contracts platform and value transfer protocol. Qtum uses proof-of-stake consensus, meaning node operators are rewarded for validating transactions. It is a DGP governed blockchain where community participants can vote to change certain network parameters. Qtum is built on a bitcoin core fork, but the foundation has created its own hybrid blockchain with the help of several key tools. The coin uses bitcoin’s chain because of its simple and stable nature, allowing the foundation to build upon it more easily. As the QTUM project is a hybrid of Bitcoin and Ethereum, its team comprises of members from both Bitcoin and Ethereum community. They also have team members who formerly worked with Tencent, Alibaba, Nasdaq etc. Apart from that, they are backed by some notable VCs and prominent people from the Blockchain community such as Patrick Dai (Project Co-Founder), Neil Mahi (Chief Blockchain Architect/Co-Founder) and Jordan Earls (Lead Developer/Co-Founder). Qtum provides a Turing-complete blockchain stack and is able to execute smart contracts and decentralised applications like the Ethereum blockchain. Qtum builds on Bitcoin's UTXO transaction model and uses the Proof-of-Stake algorithm. It is backed by some highly prominent members of the blockchain community such as Anthony Di Iorio, Xu Star, Bo Shen, David Lee, Jehan Chu and Roger Ver. Qtum sold over 10 million dollars’ worth of its tokens after only 90 minutes, eventually raising a total value of $15.7 million before stopping the campaign early after only 5 days. They raised a total amount of 11,156.766 bitcoins (BTC) and 77,081.031 ether (ETH) in exchange for the 51 million Qtum tokens being distributed to the public. In Qtum’s whitepaper, 51% of the coins were distributed to the public via the crowdfunding campaign. Of the remaining 49%, 29% of the coins would be allocated as community incentives, and the remaining 20% would be distributed to the early backers and development team.
Bytecoin is the first cryptocurrency created with CryptoNote technology. Bytecoin allows users to make absolutely anonymous money transfers through the CryptoNote algorithm. CryptoNote uses CryptoNote ring signatures to provide anonymous transactions and allows you to sign a message on behalf of a group. The signature only proves the message was created by someone from the group, but all the possible signers are indistinguishable from each other. Even if outgoing transactions are untraceable, everyone may still be able to see the payments received and thus determine one's income. By using a variation of the Diffie-Hellman exchange protocol, a receiver has multiple unique one-time addresses derived from his single public key. After funds are sent to these addresses they can only be redeemed by the receiver; and it would be impossible to cross-link these payments. As a primarily peer-to-peer (p2p) payment system, Bytecoin has many of the same use-cases as Bitcoin. Created in 2012, Bytecoin is one of the earliest developed cryptocurrencies. Until recently, the team behind the coin has kept themselves anonymous. Now, though, they’ve opened up multiple communication channels, removed some layers of anonymity, and even built several local communities. Bitcoin’s PoW consensus algorithm heavily favors miners that use powerful GPU and ASIC machines over those trying to mine with CPUs. This causes the network to centralize around the more powerful miners. Bytecoin attempts to close the gap between these two classes of miners with a new algorithm, Egalitarian Proof-of-Work (PoW). Egalitarian PoW uses a version of skrypt, a proof of work function similar to the hashcash function used by Bitcoin. The difference between the two is that scrypt isn’t memory bound. Because of this, you can produce highly efficient CPU mining rigs. GPUs will always be about 10 times more effective, though. The Bytecoin project has been fairly fractured since its inception in July 2012. Previously, several isolated teams worked on the project without seemingly communicating with each other. This led to numerous forks and versions of the coin. In July 2017, the team decided to change their image and provide more transparency to the community. The team still remains pseudo-anonymous by only providing names and headshots on their webpage – no bios or social media links. But, it’s tough to expect more from a project that’s focused on privacy. The team has been busy at work refactoring their code and are planning to release a new public API on February 6, 2018. They’ll also be entering the Asian, Middle East, and African markets throughout 2018.