I find the GREENCOIN ( GRE ) Whitepaper which what you read is very interesting and if this is as it is it must skyrocket the GreenCoin ( GRE )

Also if it is worked out by the GRE people behind the coin or somebody else to work this out..!!

http://secure-temple-6133.herokuapp.com/GreenCoin-Abstract_v1.0.pdf

Hope this work out...