Actually, the tax collector will, and must, accept money (gold and silve coin) but only at face value, not fair market value or spot value.
What you did with goldsilver.com is barter with bitcoin. If bitcoin were redeemable it would be for the same amount today as when you thought you redeemed yours last time. No less and no more.
RE: As Bitcoin Closes In On My $5000 Target Price, Remember "You Aint Seen Nothin Yet." By Gregory Mannarino