The reason why crypto-currency is such a hit right now is because of the possibilities it hold for the future of the world.

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.

You can also earn very competitive interest on crypto, which I'm experimenting with now (8.6% APY on USDC, for example).While this is still early, and there are some logistics to work out, I'm sure any real estate investor will understand how disruptive this truly is. 

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:)

Sure enough I found a Google account on 4 websites, 2 crypto platforms in 2018, no wonder I was being stalked because I was battling a settlement due to a head injury and I assumed I was being tracked.

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.