After the widespread use of stablecoins, if stablecoins are mainly pegged to the US dollar (USD), euro (EUR), pound sterling (GBP), Japanese yen (JPY), and Chinese yuan (CNY), these countries are equivalent to expanding their currency influence globally through stablecoins. For example, the United States can indirectly influence the transactions of other countries by controlling the rules of the US dollar stablecoin, which is a bit like "using digital coins as the key to global wallets".