Japanese cryptocurrency exchange bitFlyer will impose a 48-hour “cooldown” on sending crypto to external addresses after a Japanese yen deposit, with the rule taking effect on Thursday, October 15, the exchange announced on Friday, October 2.

Under the change, customers who fund their accounts with Japanese yen must wait 48 hours before they can transfer cryptocurrency out to external wallet addresses. The company's notice frames the change as a protective defense. Delays of this kind create a window in which unauthorized transfer attempts can be identified and blocked before funds leave the platform — a safeguard that carries particular weight because cryptocurrency sent to an external address generally cannot be reversed once dispatched.

Founded in 2014 and headquartered in Tokyo, bitFlyer is one of Japan's longest-operating digital asset exchanges and holds registration with Japan's Financial Services Agency (FSA). Japan maintains one of the world's stricter regulatory regimes for cryptocurrency operators, a framework reinforced after the January 2018 hack of domestic exchange Coincheck, in which roughly $530 million worth of NEM tokens was stolen. In the years since, the FSA has applied increasingly detailed supervision to registered operators, with exchange security and the protection of customer funds among the central areas of focus.

Time-delay controls between incoming fiat deposits and outbound crypto transfers are a common feature among regulated exchanges, generally aimed at curbing losses from unauthorized account access and fraudulent transfers.

For customers, the practical effect is one of timing: yen-funded balances will not be immediately transferable to external wallets, so those who routinely move purchases into self-custody or to other platforms may need to factor the two-day window into their plans once the rule takes effect on October 15.

This report was first published on COINOTAG: bitFlyer Limits Bitcoin (BTC) Withdrawals 48 Hours After Yen Deposits From October 15