The bull market of early 2021 drew in many newbies, but almost none of them stayed as things cooled down, EXMO exchange CEO said.
Using Ledger Vault's "battle-tested" custody tech, the exchange says security will be enhanced for users as well as other benefits.
The exchange said it's working to bring services back online following the attack.
EXMO has confirmed an estimated $4 million of cryptocurrency was stolen through the exchange Poloniex during a hack on Dec. 21.
EXMO says it is "assuming" the attacker had prior access to some of its hot wallet keys.
The incident saw losses of bitcoin, XRP, zcash, tether, ether and ethereum classic, according to early analysis.