III. THE IMPERIAL COINS
While states started dealing in large quantities of precious Substance, it did not make sense for common folk. Common folk needed to do small trade and rulers needed to tax it to raise money for roads.
The catastrophe devalued all currencies and rendered them equally useless. People turned to in-kind trade, which was inconvenient and made international trade almost impossible. The long-term insecurity in national substance yield and its short-lived nature made this resource not suitable to back a currency.
Then the last imperial coin stash was found.
An international expedition for substance deposit location in independent territories located the stash while drilling somewhere in Stara Planina mountain chain.
The International Economic Recovery Committee seized the opportunity and managed to convince their respective governments this could be the long аwaited chance for a restart.
An international monetary fund was established and the imperial coins became the new common currency. They had all the features to become that:
they were made of gold and copper (for some reason there were no silver coins in the stash whatsoever),
they were not bound to any of the existing contemporary states, but rather were a common, shared legacy,
they were a symbol,
and they were very, very, very scarce.