To clarify, use of the original "right tilted", "orange" #Bitcoin #BTC logo continues unhindered 'as-is' in the public domain."
I don't get it. If the logo is in the public domain, then how can its use be restricted?
I maintain Threshold of Originality over the current Bitcoin BTC logo / design concept, as a proven originator of the logo design.
I can therefore apply (and legally enforce) Trademarks in jurisdictions.
Correct me if I am wrong, but you state that the logo is public domain, which is equivalent to saying that there is no copyright.
Copyrights and trademarks are different things. Unlike a copyright, a trademark must be registered. If you have registered a trademark, then I guess you can sue for infringement. Have you registered the logo as a trademark?
I'm not an expert, so I apologize if I have made a mistake.