This is not tax advice - but couldn't you just hold them in one place for a year, convert them to dollars, and report them as long-term capital gains with a cost basis of $0? That might be wrong, but I don't think you could be penalized for _under_estimating your cost basis.
Note: I don't know this for sure, so if someone knows the right answer, would be good to know.
Yeah thanks, that's sort of what I'm thinking of doing.
I got most of then when bitcoin was $80 - $900, so I don't mind over pay tax.
Just don't want my bank accounts frozen, assets seized, and to have to prove I'm not a drug dealer or something.
Note: I don't know this for sure, so if someone knows the right answer, would be good to know.