i just wanted to pop up and say.. its nice seeing an interesting algo.. on a fair launch coin .. that didnt die after the first 3 months.. still alive and kicking! there is some sass going on in the forums. LOVE IT.... i played with this some last year.. and just started up a new install of the wallet today and no issues..

kudos to ZETTEL. big big KUDOS to you!
this project plays with hashrate is nothing new , old trick worked just for kids !!!
created by some own miners try manipulate hashare with hardfork..

Zettelkasten's POW is called "burgerhash" and it softforks automatically 4 times a day, in order to increase algorithmic complexity of POW.
As far as I can see this is a unique feature no other altcoin has implemented.