I can easily get that here in the US without the political and currency risk.Now if you could show I would have 10% yield with a likely 100% valuation pop in a couple years, that gets more interesting.

Properties 1-3 were purchased with dumb-luck money from cryptocurrencies.

We watched the pound to dollar rate, and we transferred the funds when the currency was in an advantageous position. 

Ryan Landis maybe a crash in the bitcoin / cryptocurrency markets ?

They may not.They will be required to fill out a CTR (currency transfer report) as it is over $10,000. 

., it sounds like to do what I want to do, I would move my  solo Roth 401k from my online brokerage to a truly self-directed Solo Roth 401K, and then have the new plan turn around and open an account at an online brokerage, possibly the same one I just left... but the new plan could also open another account for cryptocurrency... another for crowdfunding... it could buy and sell paper... flip houses or wholesale without UBIT or self-employment taxes... and I could buy when it's good to buy, and sell when it's good to sell, and not have to worry about capital gains, depreciation, 1031 exchanges, tax on interest, and so on... did I get that right?

@David Flores in my opinion if your goal is to sell any property at 50% of market value just work backwards from there on how much you would like to make. in your example of this property lets say you wanted to make $5,000. that property would have to retail at $34,000 in order for you to sell it at 50%($17,000) pay the $10,000 in liens and pay the owner $2,000I think everyone is going to be different on what they think their time is worth so if your happy putting up $12,000 for liens and purchase to make $3,000(25%ROI) because the market value is $30,000 then do it at the end of the day you have hungry new investors willing to make a $1,000 and get some education then you have pros that won't do a deal for less than $10,000. you just have to decide what your willing to accept both in monetary and education because both are currencies in the investing world@Brandy Horkey I second what you've said, I know in Florida that the county appraised value is strictly for tax purposes and not what the actually market value for a property is.

Real Estate is tested and proven over centuries to provide the opportunity for wealth with crashes once every few decades and Bitcoin is a unproven cryptocurrency that uses block chain technology.

Basically, I need to transfer a big amount of money to the states, and convert it from the currency we use here (New Israeli Shekels) into dollars.I was wondering if anyone here at bigger pockets has experience or advice how such a thing could be done safely and cheapest as possible?

Use cryptocurrencies.