Getting back to the first post in the thread... You're asking for what appears to be COMPLETELY empty hands, and then have a coin end up in classic palm.
Why not actually have your hands empty, and do a steal? You could use a magnetic half and pocket magnet, or a "hoo" coin (if you don't know, don't ask
, or just load from a coin dumper, lapel steal, or sleeve.
If it MUST be in your hands, why not do a fickle nickel thing?
People, don't be afraid to gimmick it up! You get much more impossible productions than can be done with pure sleight, which look very natural, and are EASY! The easier it is on the magician, the better... because then you can focus on the REST of the performance.
I'm not saying DEPEND on the gimmick... sure, go ahead and learn some handwashing! But it may not be as amazing to LAYPEOPLE as, say, Fickle Nickel.
Scott.