I don't think your gold analogy is correct because nobody can create gold out of nothing (mining requires a ton of work). Fiat currencies however can be create

I don't think your gold analogy is correct because nobody can create gold out of nothing (mining requires a ton of work). Fiat currencies however can be create from nothing by central banks and normal banks (multiplicative effect due to fractional reserve lending). What violates the Greek sovereignty is the fact that a bank they don't control can create their money out of nothing.