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If you searched what is a witness I'm sure the video you'll be find will help you better than me but it's my understanding it's the people that mine steemit and host or lease the servers. If I became one I would not least anyting I would host it all myself and ensure it's running always.

I will check video....and I'm unable to vote to you...it's showing error after signing in...Screenshot_20180317-194032.png

Thanks for trying, I may need to start mining before I am eligible for votes!

This is time my friend! All cryptos are going down. Steem is trading at 1.87$