Just a crazy thought, if due to some chain of events of this or similar events China devalues Dollar - can a backup currency like cryptocoin(s) be used in resu

Just a crazy thought, if due to some chain of events of this or similar events China devalues Dollar - can a backup currency like cryptocoin(s) be used in result of such emergency? Also I strongly disapprove of imperialist move by China, Filipinos are nice people and no need to be an aggressor against such a small country. my 2c