title_body: Ways to burn tokens? What are all the ways to burn tokens, including ADA and other tokens? By burning, I mean to remove it from the sum balance of all addresses. E.g. one way is to mint a negative amount of a token. Are there other ways? (Sending tokens to an address that nobody controls doesn't count; I want the token to be completely gone.)
  I'm also specifically looking for a way to burn a token after the 'before' slot of the minting policy has passed.
upvoted_answer: There is no way to burn ADA.
  You can burn the native tokens, if you have the singing keys for the tokens policy and the policy allows it.
  If the policy doesn't allow it (locked by time slot), at the moment, there is no way to burn them, but IOG is going to introduce a way to do it in the near future, so keep them around.