LOL, I had to go look this up myself. I shit a brick when when I heard proof of space, I assumed you guys meant physical space, I see now you are talking about memory capacity. There were a few old alts that had physical metrics in the mining (Solarcoin for example), I thought this was that

for anyone else who is clueless about Proof of Space:
ELI-5: Instead of Proof of Work (CPU calculations) or Proof of Stake (coins possession), the paper introduces Proof Of Space (HDD space owned).
What consequences or advantages it gives - need to read the paper.
Although I like PoS better - enough wasting planet's resources.
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This would actually be fun to mine
