The proposal follows a new law, signed by President Vladimir Putin on Aug. 4, that gives the Bank of Russia authority to determine which digital currencies can be admitted to organized trading and set related rules.

Under the rules, non-qualified investors could buy up to 300,000 Russian rubles ($3,650) worth of cryptocurrency per year through each intermediary, including a broker, crypto exchange service or asset manager. Qualified investors would face no purchase limits for crypto assets traded on exchanges or over-the-counter markets.

“Before making transactions, all investors, regardless of their status, will have to pass a test and familiarize themselves with the risks of investing in crypto assets,” the Bank of Russia said.

The central bank said the restrictions are designed to protect non-qualified investors from sharp and unpredictable fluctuations in crypto prices. The regulator is accepting comments on the proposal until Aug. 24.

Related: Russia cracks down on 9 crypto exchanges in Moscow City