Is there any proof that a blockchain is (or can be) more efficient than a normal database? Seems like every blockchain I've heard about wastes a lot of energy

Is there any proof that a blockchain is (or can be) more efficient than a normal database? Seems like every blockchain I've heard about wastes a lot of energy and time to try to make stuff securely decentralized and if we are going to have special authorities anyway the least secure part will be their keys/access to the chain and the decentralized part isn't really true anymore.