Maybe sign a message with an address whose unspent outputs were used to fund whalemixer's deposit addy?
This doesn't prove anything. The problem is, there's no way to know which address is owned by WhaleMixer. WhaleMixer setup their site in such a way it's impossible to prove anything, and since they're a "classic" mixer (without chips and private keys), there is no valid reason not to provide a signed Letter of Guarantee. Unless they plan to cheat their users, of course.
He already admitted coins suddenly showed up in his wallet, so maybe it's time to show some proof?
He also claimed to have returned them.
so maybe it's time to show some proof?
I sent LoyceV a PM
All I know for sure is that the address received Bitcoins 4 days ago, and they haven't moved since. There's no way to prove anything.
I think it's time you create a
Scam Accusation for a Flag. Unfortunately, there's no hard evidence for a type 3 Flag, but the fact that the mixer is setup to deny the user any evidence, should be enough to justify a Newbie warning Flag (type 1).