Gold is so 17th Century. Gold coins have been counterfeited since they've been invented and are still today.
Counterfeited gold coins HAVE to be made of gold to a (not small) degree. If not then alloy density will simply mismatch too much. USG scanners show structure of insides; even wolfram based fakes will not pass such a test.
For a comparison, paper currencies are counterfeit to a much higher degree already. And found fake banknotes lose all their value immediately. So gold coin (even when faked) is much safer.
Much of it can be found at the bottom of the ocean where it was unsuccessfully protected by the ships that carried it.
Even today we have catastrophes of many kinds; people die and/or lose all their wealth. Do you mean that because there is always some kind of risk we should dismiss ways of wealth preservation?
You may assay gold to a point, but you are not assured 100% results.
No - gold as physical element has enough unique properties to be 100% sure it's gold. Unless an assayer is completely incompetent.
Gold is just not a convenient form of exchange. Every time it changes hands there is risk of it being stolen.
Every time you are going to use cash there is chance it may be stolen. Every time you are making credit card transfer there is a chance it may be stolen. Basically every time you are getting out a house you may get robbed, too. So what you really says is that bad accidents do happen? Yes they do - it's just life like it is...
Holding gold is nothing more than enabling the irrational behavior it elicits. I just don't see any reason to treasure gold any more than the artwork much of it was melted from. Who knows, maybe guys like Thiel will bring back pirates and highwaymen armed with metal detectors and weapons? Lock your doors and hide your gold well. Or you can always trust the banks to keep it safe, look how well they treated your paper money, after all.
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Then I don't understand your previous statements... As anything else BTC has it share of associated risks too.