 Hi, so we have come up with a new proof of space construction which is simpler and more practical than pebbling based ones and has unique solutions. We have published this now, it's available to everyone. We are having a programming competition for best implementation of it. We made a reference implementation available with a whole bunch of documentation about how it works and thoughts on possible ways of improving it and we have $100,000 in price money that we're going to be giving away for best implementations of this and it's open to the public, anyone is free to enter, just submit, people submit the code and we'll run it on our benchmark hardware and it's objective judging. Please check it out.