The momentum effect is that if the bitcoin price rises continuously over a week, it may keep growing for the next week. This is a common feature of almost all known asset classes, and we have found that the momentum effect strongly affects the cryptocurrency. We have designed a simple investment strategy in which investors buy Bitcoin only when their price increases by more than 20% from the previous week. This strategy has excellent returns and a very high Sharpe ratio.

bad strategy
NEVER EVER BUY HIGH
seriously only buying AFTER the price has risen by more than 20%!! (facepalm)
also the first sentance that bitcoin rises continuously over a week.. (you earn a double facepalm)
bitcoin moves in daily and weekly waves of ups and downs.
its the yearly rise people notice.
2016 >300
2017 >900
2018 >5800
what the OP is actually proposing is users pay him funds.. he then blows peoples funds to try to cause a spike so that he can sell HIS OWN STASH at tip of spike while then left the people that paid him with the losses when the spike corrects down(going below the buy in price he pushed)
.. thats if the OP even intends to give back any returns (as his scheme seems so very dodgy in the first place)
OP seems very lacking of economics and dare i say it ethics from what i read