id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
blog-dshr-org-1332		DSHR's Blog: Proofs of Space			.html	text/html	3554	454	85	I'll first outline Cohen's critiques of Proof of Work, Proof of Stake, and Proofs of Other Things, then summarize his proposed scheme combining Proof of Space with Verifiable Delay Functions (PoSp/VDF), and conclude by addressing the aspects of his talk that concerned me. "Bitcoin fixes this by making grinding the expected behavior rather than an attack" using Proof of Work, in which peers try to invert a hash function. Bring in verifiable delay functions (VDFs) and alternate between proofs of space and time The Proof of Space workload would increase the drives' duty cycle somewhat, since it requires a few disk accesses per block time. Another aspect of the talk that concerned me was that, as I understand it, Cohen's vision is of a PoSp/VDF network comprising large numbers of desktop PCs, continuously connected and powered up, each with one, or at most a few, half-empty hard drives.	./cache/blog-dshr-org-1332.html	./txt/blog-dshr-org-1332.txt