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I understand you have no idea of logic.
Consensus about the Genesis Block is more a question for linguistics than computer science. Just like gold is that shiny yellow metal with atomic number 79, the Genesis Block is that collection of bytes with the message "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks" encoded and with hash 00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048.
Where did you get this hash from? From your memory?If I remember the thing about the Chancellor and the Bailouts and if I have that one number memorized (block hash), then I can personally verify whether a genesis block is The Genesis Block. The analogy to gold holds once again: if I remember that gold is shiny and yellow and if I have it's atomic number memorized, then I can personally verify whether a metal is Gold.
Damn Peter. What is the matter in answering that simple question?
(But I see that you are able to abstract - well done)