South Korea’s finance regulators are expanding measures to verify cryptocurrency investors’ identities, as part of the country’s moves to control one of Asia’s hottest bitcoin markets. Korean regulators Tuesday said only individuals with verified bank accounts linked to cryptocurrency exchanges will be able to inject more fiat money into virtual currencies. The government has already announced banning the use of anonymous cryptocurrency trading accounts. The new regulation goes further, requiring banks and exchanges to identify who their customers are, and will come into effect from Jan. 30. The new South Korean rule will require customers of cryptocurrency exchanges to open accounts at banks that provide services to the trading venues, if they want to invest more money. Investors who don’t have accounts at the banks can withdraw money from their cryptocurrency exchange accounts, but not inject extra fiat money. An expanded version of this report appears on WSJ.com.