Evaluate Xim Again

[nopara73]

I wasn't aware of the code and the second paper, so I may have missed some interesting parts last time I took a look at it.

https://github.com/hudon/refraction-hs

http://elaineshi.com/docs/bitcoin.pdf

http://forensics.umass.edu/pubs/bissias.wpes.2014.pdf

[nopara73]

Last evaluation: #32 (comment)

[nopara73]

Xim [9] improves on its related previous work [6] in that
it uses a fee-based advertisement mechanism to pair partners
for mixing, and provides evidence of the agreement that can
be leveraged if a party aborts. Even in the simple case of a
mixing between two peers, Xim requires publishing several
Bitcoin transactions in the Bitcoin blockchain, which takes on
average at least ten minutes for each transaction.
In contrast, CoinShuffle++ requires to submit a single
transaction to the Bitcoin blockchain independently on the
number of peers. Source.

ZeroLink is like CoinShuffle++ and their authors came to the same conclusion as me in my previous evaluation. I am short on time and I doubt I missed anything.