BitcoinTX is an attempt at reformulating Bitcoin with Proof of Stake and using the X11 algorithm. Initially there was a PoW phase. After that, it was all PoS but there was a problem in the "lucky stake" code. The original developer(s) walked away. After that, they licked their wounds, started a little "crowd-fund" for a new developer to fix the code and managed to go forward with the project!
BitcoinTX (BTX) Features
Technology Specifics for BitcoinTX (BTX)
BitcoinTX (BTX) uses the X11 algorithm and relies on the PoS proof type.