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I appreciate your time replying my question, but I'll ask other thing. For example I have shade token and I want to burn to use as upvote. How will I do it? just send that token and put memo by @null? is that correct?

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That would likely only be possible if the Shade token creator has it set up to work that way.

The HoboDAO is set up to allow people to burn Hobo tokens by sending them to @hobodao (a permanently locked account) with a post address in the memo area and that enters the author into a contest. But not all token systems involve a burn option.