>Not a billionaire, but also trying to keep some percentage of my net worth in cryptocurrencies. Worked great so far. 10% seems to be about right.
I don't see how people can look at cryptocurrencies as investments over the long term. It's like saying you have all your money in Swiss Francs in a checking account that returns no interest because you think the Swiss are doing a stellar job at setting up an economy/banking system.
In the short term you're basically betting on cryptocurrencies gaining adoption and thus more of the economy needing them. In the long term it's just a currency not an investment.
>(I have much more trust in blockchain than in government retirement schemes).
That's not the alternative, some kind of diversified portfolio of stocks (a simple index fund is usually the easiest) is the right benchmark. Personally I will always feel safer with owning a (very small) percentage of the total productive companies in the world than a currency that's only worth something as long as someone is willing to keep trading in that specific one and not change to some other one. I look at the value of my stock holdings in euros only because it's also my day to day currency but the underlying value can be repriced in any currency over the next 50 years (my investment horizon).
What I would really like to do is price my stock holdings as percentage of total world stock market capitalization (with plenty of decimal points). Anyone have a good source for that number?