Vitalik: How much would it cost to launch a 51% attack on Ethereum? Ethereum founder Vitalik @VitalikButerin mentioned in an interview in Bangkok that even if Binance successfully launched a 51% attack on Ethereum, they would lose billions of dollars due to slashing penalties or minority soft fork-induced downtime. He believes that Ethereum's current security is excessive, with an attack cost as high as $48 billion. By moderately lowering the economic threshold and instead strengthening the robustness of the P2P network layer and consensus layer, Ethereum as a whole would become even more secure. Source: Vertigo Video