Quote from: p2p on January 29, 2016, 12:36:33 PM

What's the status of Momentum POW? Was it used in Bitshares? Is it used in any coin?

It is broken beyond repair according to

https://eprint.iacr.org/2015/946.pdf

Their Proposition 9 states a sublinear time-memory tradeoff.
For instance, collisions can be found in memory O(sqrt(N)) and time O(N^(5/4)),
instead of memory and time O(N).

This Proposition is based on the golden collision search technique, described in Section 4.2 of

http://people.scs.carleton.ca/~paulv/papers/JoC97.pdf