eg. DASH:

Blockchain security right there

- and it's been this bad for well over a year, with 3 pools owning 90% of the hash.
Much the same issue i hope we can resolve. very delicate stuff though, I am trying to formulate a form of dynamic consensus over block produced by BNs...
A node has to be a BN....and only eligible to produce 1 in every 5 blocks if the Bn count is higher than 5.....all the while the look up must be inexpensive (computationally)