Gold is less practical value than copper, except that we artificially assign a higher price to it.
It is that assignment of value, and our acceptance of that value that matters - it is the same with paper currency, or the banking records where most of that value is evidenced.
Monetary values are really no different than religious beliefs, except they are much more useful when commonly shared.
If someone is willing today to value one bitcoin at $60,300.10 USD (today's price) and give you that sum in USD for the bitcoin you have in your computer, why is that any different than someone being willing to give you $60,300.10 USD for $75,239.45 Canadian Dollars in your Canadian dollar bank account? (that is today's exchange rate).