According to Foresight News, Vitalik Buterin said in a reply to a netizen on X, "What is a global blockchain?", "Blockchain is a 'truth machine'. In a specific sense, it provides a consensus approximation of the truth about when a message was sent, but it will not tell you whether the moon landing was true."

This significantly reduces the attack surface of the blockchain, but it does mean that we need other tools to actually perform (or assist with) the latter kind of truth discovery.”