Viacoin is an open source crypto-currency created in 2014, derived from the Bitcoin protocol that supports embedded consensus with an extended OP_RETURN of 120 byte. Viacoin has a total supply of 23 million coins with mining reward halving takes place every 6 months. with a transaction speed 25x faster than Bitcoin. Other features include a mining difficulty adjustment algorithm called DarkGravityWave which was designed to address flaws like the Time warp attack in Kimoto Gravity Wave algorithm, Scrypt Auxpow and Versionbits to allow for 29 simultaneous Soft Fork changes to be implemented at a time. Several features can be deployed at the same time Viacoin Whitepaper: