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Re:SEC Rejects Rule Change for Bitcoin Exchange-Traded Fund ... by npongratz on Saturday March 11, 2017 @10:52AM (#13845784)
Not a public debt or tax, and it's noted that this doesn't "legitimize" Bitcoin in the minds of the authorities, but looks like Norwegian prosecutors recently demanded the penalty for one criminal act to be partially paid in Bitcoin:

https://cointelegraph.com/news/pay-up-in-bitcoins-norway-pro...

Re:SEC Rejects Rule Change for Bitcoin Exchange-Traded Fund ... by Natanael_L on Saturday March 11, 2017 @11:14AM (#13845876)
Has happened in USA too in at least one civil case, with a contract denominated in Bitcoin