Sell it on any above-board exchange, wire the money to your bank account, if there's any income (either when receiving these coins for something, or capital gai

Sell it on any above-board exchange, wire the money to your bank account, if there's any income (either when receiving these coins for something, or capital gains due to them appreciating in value), file the appropriate documentation with IRS or whatever your local tax authority is. If the income is substantial, then (just as with any less common substantial income) a tax lawyer might be helpful.