I had included utilities in the rent on a condo I own, and the tenant was mining crypto-currencies.

Paper or digital currency does not rely on having intrinsic value.

The number of companies directly accepting Bitcoin is growing, but even if they accept Bitcoin, the value of the goods is tied to USD and they convert at time of sale to Bitcoin.It is worth watching the trends as crypto and blockchain evolve, but ultimately this is a way to secure transactions, a payment method and currency, not a replacement for real estate agents.

Honestly , if I were you I would look at crypto currency now:)

Change your American money for Chinese currency.

I've never found any gold or silver, and very few currency, usually some cash in an envelope, or stuck in cards or books.

The one thing I never discriminate against is green US currency:)

I am not a lawyer, nor do I play one on TV- however, this post on the US Treasury site might help answer your question-http://www.treasury.gov/resource-center/faqs/Currency/Pages/legal-tender.aspxThe way I understand it- if as a landlord, you are considered a creditor, you MUST accept cash.

With Xero I was dealing with multiple currencies which became a complete nightmare and found a great accountant who sat down and walked me through it.If you find that this is too much work or too difficult you could easily give a bookkeeper a login for you account and they could take over.

Reading Robert K, and with your recent loss there is a new currency  I think you will be enjoying- time.