Oh, it looks like the pointless inflammatory BitMagic has graced us with his presence again, and he still doesn't know what he's talking about.
Welcome back, old_engineer! I know you just love it when I have something to say that makes you look stupid. Indeed, I dropped a decimal (40k BTC * $5 = $200,000 * 0.6% = $1,200). Fortunately for me, your omissions make me look even better. Fuck fees, obviously.
I'm glad to see you don't disappoint, PIBM. My point is that if a $12k exchange fee on a $200k purchase passed your smell test, instead of calling it a "downpayment", you obviously have no experience in these matters, and no one should heed your advice.
You wouldn't have anything to say about the truth of the matter, because you'd rather poke at arithmetic mistakes than face the reality: insurance.
Aaaand it looks like insurance isn't your specialty, either. Mortgage insurance, and all the formalities around MI, are only required in the US if you pay less than 20% of the principle as a down payment. And of course, a mortgage is only required if you can't buy a house free-and-clear, and require a bank to own the property for you. The OP said nothing about getting a mortgage, just that 40k btc was paid for a house.
Perhaps Bitcoin denominated mortgages and mortgage insurance could happen in the future, but that's far-off speculation, and bitcoin prices would have to be more stable than the local fiat currency. I don't think this would ever happen in the US in your lifetime, but some fiat currencies have experienced 100%+ monthly (not yearly) inflation - see Argentina in the 90s - and if bitcoin prices are relatively stable 10 years from now, bitcoin could be a more reliable store of value than the local fiat currency, and there's no reason why an entrepreneur couldn't start providing bitcoin-denominated mortgages in that country.
Don't play dumb, you know what we were discussing: a property sale in bitcoins, and why it could never happen
No, there is nothing that prevents someone from paying for property right now in the US with any combination of USD, bitcoins, or goats. Once two parties agree on the payment method and sign the sales agreement, the only paperwork filed with the state is the title change, which is filed at the recorder's office. Taxes are calculated as a percentage of the sale price, which would be done as USD equivalent, same as if you sell your house for a herd of goats and two oxen. Being impossible to forge, the Bitcoin blockchain could provide proof of payment that would hold up in a court of law.
And for the record, I'm not a libertarian, I own no bitcoins, and I used to be be young and ignorant once, but I didn't pretend that I knew it all.