A global currency that will rise up like a phoenix out of the ashes

Start at 3:23 the narrater says a new global currancy will rise up like a pheonix out of the ashes.

In Greek mythology, a phoenix or Phoenix (Greek: φοῖνιξ phoinix) is a long-lived bird that is cyclically regenerated or reborn. Associated with the sun, a phoenix obtains new life by arising from the ashes of its predecessor.

What old currency could be brought back to be a Global Currency?