According to Charles Hoskinson, founder of Cardano and co-founder of the Ethereum blockchain, Cardano’s proof-of-stake (PoS) blockchain is much more decentralized and secure than Bitcoin’s proof-of-work (PoW). It’s also more scalable and energy-efficient. In the context of preventing a 51% attack, Cardano is safer than Bitcoin because the attacker has to accumulate more than 51% ADA tokens to take over the blockchain.