BitMart Founder: Exchange Also Hacked Yesterday, Possibly by the Same Group as the Brazilian Mercado Bitcoin Theft BitMart, a cryptocurrency exchange that has already announced its closure and is undergoing restructuring and liquidation, was also hacked yesterday, according to its founder, Sheldon Xia. The amount involved was relatively small. The team has launched an investigation and strengthened security measures. He stated that preliminary investigations indicate the attackers may be the same group that stole the Brazilian exchange Mercado Bitcoin yesterday.