Gold is also quite troublesome, but BTC cannot gain everyone's trust, so there is no better choice. Maybe it's still gold. Or it could be a three-level system of gold BTC fiat currency, corresponding to the ancient three-level currency system of gold, silver, and copper. Gold is only used for bulk trading and settlement purposes. BTC can be used for B2B transactions and high-value personal consumption Backed by gold and BTC, fiat currency can be a digital currency used for other consumption purposes.