Arthur Hayes, BitMEX co-founder and major ether (ETH) holder, asked Ethereum co-founder Vitalik Buterin to rollback the network in order to assist hacked exchange Bybit, which lost nearly $1.4 billion in ether (ETH) on Friday.

“@VitalikButerin will you advocate to roll back the chain to help @Bybit_Official. My own view as a mega $ETH bag holder is $ETH stopped being money in 2016 after the DAO hack hardfork. If the community wanted to do it again, I would support it because we already voted no on immutability in 2016 [wh]y not do it again?” Hayes said on X.

Buterin was yet to reply as of time of publication.

The Bybit hack came into light on Friday when on-chain analyst ZachXBT noted suspicious outflows of over $1.4 billion from the exchange, with the attacker quickly swapping mETH and stETH for ether through a decentralized exchange.

The attacker then split 10,000 ETH to 39 different addresses and another 10,000 ETH to nine addresses, Gautham Santhosh, co-founder of Polynomial.fi, explained on X.

Bybit CEO Ben Zhou said that the hacker “took control of the specific ETH cold wallet and transferred all the ETH in the cold wallet to this unidentified address.” Zhou confirmed that the exchange “is solvent even if this hack loss is not recovered.”

One of the potential ways to address hacking is to roll back the blockchain. It involves reverting the blockchain to a state before the occurrence of a specific event, in this case, the hack. That way, malicious transactions resulting from the hack can be erased, effectively restoring lost or stolen funds. Implementing a rollback requires consensus from the network participants.

For instance, in 2016, the Ethereum network was rolled back using a hard fork to reverse a theft of $60 million in ether from The DAO (30% of all ETH in circulation back then). The hard fork split the chain into two – Ethereum and Ethereum Classic.

In 2019, Binance’s CEO Changpeng Zhao and his team considered pushing for a rollback on the Bitcoin network following a $40 million hack. However, the Bitcoin mining community criticized the idea of going back against the principle of decentralization and immutability, which are fundamental to blockchain technology.

Immutability is a security feature that prevents data from being changed after it’s added to the blockchain to make it trustworthy and tamper-proof. There are similar concerns regarding a potential Ethereum rollover.

“I wish we could roll back for the Bybit hack, I’m not against the idea. But the DAO hack was 15% of ETH with a clean recovery path. Today, a rollback would break bridges, stablecoins, L2s, RWAs and so much more. ETH ecosystem is just too interconnected now for a clean solution like 2016,” Santhosh said.

Sina 21st Capital explained that Ethereum is now stuck between a rock and a hard place.

“Ethereum is toast. They can roll back the chain and destroy what is left of the decentralization claim or allow North Korean baad actors to keep $1.4B of ETH and unleash an eternal internal battle. Either way, it is terrible,” Sina 21st Capital said on X.

Ether has dropped nearly 3% in 24 hours, but continues to trade rangebound between $2,600 and $2,800, CoinDesk data show.