In a Reddit post on Friday, Vitalik Buterin, the co-founder of Ethereum (ETH), outlined critical security concerns surrounding cross-chain bridges in the blockchain ecosystem. As told by Buterin, storing native assets directly-chain (Ethereum on Ethereum, Solana on Solana, etc.) provides a certain degree of immunity against 51% attacks. Even if hackers manage to censor or reverse transactions, they cannot propose blocks to take away one’s crypto.
The rule also applies to the Ethereum application. For example, if hackers launch a 51% attack (by controlling 51% of all circulating ETH supply) while an investor swaps 100 ETH for 320,000 DAI stablecoin, the end state remains invariant, i.e., the investor would always get either 100 ETH or 320,000 DAI.
However, Buterin continued, that the same level of security does not apply to cross-chain bridges. In the example he raised, if an attacker deposited their own ETH onto a Solana (SOL) bridge to obtain Solana-wrapped Ether (WETH) and then reverted that transaction on the Ethereum side as soon as the Solana side confirmed it, it would incur devastating losses on other users whose tokens are locked in the SOL-WETH contract, as the wrapped tokens are no longer backed by the original on a 1:1 ratio.
Мојот аргумент зошто иднината ќе биде *повеќе синџир*, но нема да биде *вкрстен синџир*: постојат фундаментални граници за безбедноста на мостовите кои се движат низ повеќе „зони на суверенитет“. Од https://t.co/3g1GUvuA3A: pic.twitter.com/tEYz8vb59b
- vitalik.eth (@VitalikButerin) Јануари 7, 2022
Поврзани со: Виталик предлага нова „мултидимензионална“ структура на такси Ethereum
Source: https://cointelegraph.com/news/vitalik-buterin-gives-thumbs-down-to-cross-chain-applications