On Friday, 27 March 2015, at 4:57 pm, Wladimir J. van der Laan wrote:
> On Fri, Mar 27, 2015 at 11:16:43AM -0400, Matt Whitlock wrote:
> > I agree that someone could do this, but why is that a problem? Isn't the 
> > goal of this exercise to ensure more full nodes on the network? In order to 
> > be able to answer the challenges, an entity would need to be running a full 
> > node somewhere. Thus, they have contributed at least one additional full 
> > node to the network. I could certainly see a case for a company to host 
> > hundreds of lightweight (e.g., EC2) servers all backed by a single copy of 
> > the block chain. Why force every single machine to have its own copy? All 
> > you really need to require is that each agency/participant have its own 
> > copy.
> They would not even have to run one. It could just pass the query to a random 
> other node, and forward its result :)

Ah, easy way to fix that. In fact, in my first draft of my suggestion, I had 
the answer, but I removed it because I thought it was superfluous.

"Send me: SHA256(SHA256(concatenation of N pseudo-randomly selected bytes from 
the block chain | prover's nonce | verifier's nonce))."

The nonces are from the "version" messages exchanged at connection startup. A 
node can't pass the buck because it can't control the nonce that a random other 
node chooses.

Dive into the World of Parallel Programming The Go Parallel Website, sponsored
by Intel and developed in partnership with Slashdot Media, is your hub for all
things parallel software development, from weekly thought leadership blogs to
news, videos, case studies, tutorials and more. Take a look and join the 
conversation now. http://goparallel.sourceforge.net/
Bitcoin-development mailing list

Reply via email to