CRV was attacked this morning and plummeted, and the price on the chain even "returned to zero". It is hard to imagine that such an attack occurred to a leading DeFi company like CRV. The reason is that there is a bug in Vyper, the programming language of the basic layer of Ethereum. After the hacker succeeded, he quickly transferred the proceeds of the attack, resulting in the largest MEV reward block in the history of Ethereum, up to 584 ETH, and the hacker achieved a head start.

Ethereum has experienced several downtimes since it switched its consensus mechanism to POS in September 2022. Fortunately, this time it was a vulnerability in the Vyper language. If it was a problem with the Solidity language, it might have been a severe earthquake.

It is worth noting that if it were not for the "protection" of the Link oracle, this risk would spread to the entire crypto market and trigger a full liquidation of DeFi lending.

Bitcoin's POW mechanism is the safest, but the blockchain does need to expand its ecosystem. Ethereum's Vitalik Buterin also said that the core protocol should be kept simple and should not have many complex functions, because as the functions become more complex, the possibility of bugs will increase, especially if there are problems with the underlying core protocol, the entire chain ecosystem will be affected. A fact that cannot be ignored is that if Ethereum had not reduced its output by 90% and introduced a destruction mechanism to maintain market deflation, it would be difficult for ETH to maintain this price. Now a large number of ETF demands are Layer-2 and various airdrop interactions around it.

Now it seems that BTC's POW is the most reliable.