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During the last days it was very stressful.

Oh really? Dont know about the work of an Witness. I thought this is something "passive".

If the software is running alright, there isn't much to do on your node.
... If it doesn't work as expected, it can be quite painful.

Ok i understand, its importand to stay always up to date. How many votes are needed to run a witness server?

None. But then it won't be profitable.

Im gettig interested in the whole witness theme. Thanks for repling, now i will research by my own ;)