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by hmsimha 4409 days ago
http://en.wikipedia.org/wiki/Gavin_Andresen

It's a key built in to the network that essentially gives him the power to broadcast a special alert signal to the network. I'm not actually sure if most clients are equipped to interpret these signals now, though.

http://bitcoin.stackexchange.com/questions/583/what-is-the-a...

edit: I should clarify it's built into the original satoshi client, not necessarily 'the network' and certainly not the blockchain. Someone on bitcointalk explained it as "part of the peer to peer overlay and not part of the blockchain. You can find this public key in the source code of the official client if you look."