> a) accept their local currency? where? what then? what will it be worth by the time we exchange it? > b) take btc. transaction registers publicly on the blockchain. smart contracts can execute if desired, e.g. when payment x is received to address y initiate a sequence that starts delivery. currency risk is now in btc and that can be instantly mitigated by converting to your chosen currency, as the btc market is liquid. > c) require counterparty to pay in your currency, which means they pay exchange fees, increasing their costs.