California State Senate will soon vote on a Bill prohibiting dissemination of unverified claims of fact on social media. A similar law is already in force in Malaysia (NYT) with France and Belgium expected to follow suit (CNBC). As a consequence, fact-checking will become the condition of participation in the public discourse. In this article I formulate methodology for fact-checking of any statement or source, including the fact-checkers themselves, without having access to all the relevant information....