Andreas Antonopoulos will be an "expert witness" in the Bitfinex / Tether case.

Bitcoin expert Andreas Antonopoulos will act as an “expert witness” in the case of Bitfinex / Tether, opened by the New York attorney general, who accuses Bitfinex of using funds from the company responsible for the USDT to cover the lack of liquidity of the bitcoin exchange

Antonopoulos himself confirmed in your Twitter account which is involved in the investigation of two ongoing cases. Although he did not specify which ones, a statement signed by him is linked to one of the groups of lawyers who sued Bitfinex / Tether, among others, for alleged manipulation of the cryptocurrency market.