Both can be easily defeated. You can easily manipulate a reputation system one way or another with a botnet. And just because you can authenticate that a message was signed with a public key says nothing about the veracity of the content in the message.
Despite all of its shortcomings, Wikipedia has been a relatively successful model. It is decentralized with an army of volunteers that try to stick to reliable sources. It leverages the fact that honest participants greatly outnumber malicious ones.
Despite all of its shortcomings, Wikipedia has been a relatively successful model. It is decentralized with an army of volunteers that try to stick to reliable sources. It leverages the fact that honest participants greatly outnumber malicious ones.