ironfish hardfork

[Shadowofnight98]

I see that fishhash is integrated but I did not see how it was integrated into miningcore.

[blackmennewstyle]

IRONFISH (IRON) is not implemented in my repo.

I was trying to implement FISHHASH for KLS but still can't tell if it works or not since the sole existing mining software for it sucks.

Lastly, i don't think IRONFISH is an interesting project, but if you want to contribute PR are welcome :)