id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
blog-ethereum-org-4851		Slasher Ghost, and Other Developments in Proof of Stake | Ethereum Foundation Blog			.html	text/html	5591	241	64	At the very least it is possible to rely on a Bitcoin-like proof of work algorithm based on either a randomly-generated circuit approach targeted for specialized-hardware resitance, or failing that simple SHA3, and our existing GHOST optimizations allow for such an algorithm to provide block times of 12 seconds. If a blockchain does not use a consensus protocol to regulate block creation, and simply allows anyone to add a block at any time, then an attacker or botnet with very many IP addresses could flood the network with blocks, and particularly they can use their power to perform double-spend attacks sending a payment for a product, waiting for the payment to be confirmed in the blockchain, and then starting their own "fork" of the blockchain, substituting the payment that they made earlier with a payment to a different account controlled by themselves, and growing it longer than the original so everyone accepts this new blockchain without the payment as truth.	./cache/blog-ethereum-org-4851.html	./txt/blog-ethereum-org-4851.txt