According to this report from CoinDesk (
https://www.coindesk.com/binance-may-consider-bitcoin-rollback-following-40-million-hack [nofollow]) In the wake of a multimillion-dollar hack on Tuesday, 7th of May, 2019, Changpeng Zhao, the CEO of cryptocurrency exchange startup Binance publicly discussed whether the company might seek to encourage bitcoin miners and node operators to “rollback” the bitcoin blockchain, reversing transactions confirmed by the network to return the funds.
The comments were made as Zhao hosted an Ask-Me-Anything session at 3:00 UTC on Wednesday after the hack to address various questions about the hack, which saw assailant steal some 7,000 bitcoin from the exchange.
Answering questions on whether the firm would consider attempting to convince network stakeholders to roll back bitcoin network transactions, which would require pushing for consensus from major miners and mining pools to gather over 51 percent of the network’s total hashing power, Zhao said:
To try and roll back the network without an agreement between the entire industry and community would most likely be seen by many as effectively an attack on the bitcoin network, which is intended to be immutable.