Earlier quoted context omitted.
This - all things that can by done by SomethingSpecificCoin can be equally well done on smart contract platform ala Ethereum. There is no reason (except for rewarding founders and early investors) someone who want to provide taxi rides own specialized mining equipment for maintaining blockchain of a proprietary coin. I rode a taxi few months ago, and I don't remember having to change my currency for a TaxiCoin which…
it is illegal for him not to accept the national currency According to the United States Department of the Treasury’s site[1], there is no federal law requiring that businesses accept currency or coins as payment for goods or services. [1] https://www.treasury.gov/resource-center/faqs/Currency/Pages...
[0] It is obvious from your link that the Treasury intends "currency" to be interpreted as paper money, see this:
There is, however, no Federal statute mandating that a private business, a person or an organization must accept currency or coins as for payment for goods and/or services. Private businesses are free to develop their own policies on whether or not to accept cash unless there is a State law which says otherwise.