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Wild speculation
Assuming that this is indeed a legal issue it could easily be related to bitfunder which was closed for unknown reasons (right?). The weex coins are obviously involved because a big part of them was used for trading on bitfunder.
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No.
This would constitute criminal actions by Ukyo.
Using the Weex funds, held in trust, elsewhere constitutes criminal action.
At a guess, embezzlement probably best defines what it would be and you can even look up the jail terms involved.
http://www.criminaldefenselawyer.com/crime-penalties/federal/embezzlement.htmI dont think that ukyo took it for personal gains. He always wrote he didnt take the bitcoins. Which means for me that the bitcoins cant be seized too since government cant take the bitcoins without ukyo giving them to them. Of course ukyo might see seizing not like he took the coins because they have them.
The coins used at bitfunder never left weexchange so all funds used for trading were always in posession of the owner of these coins while ukyo only escrowed the coins.
By the way... if the coins really were seized then i believe that later deposits would have been seized too. I dont believe that they seized and then let ukyo move on with other funds he received later. That doesnt sound correct for me. So seized coins sound unlikely to me.