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BlockParty is not Proof of Concept nor vaporware. It was first used at DevCon2 in Shanghai depositting real Ether, then have been used to manage local Ethereum meetups and social events. NO BLOCK NO PARTY! You pay small deposit when you register. You lose your deposit if you do not turn up. You will get your deposit back + we split the deposit of whom did not turn up. You go to party and may end up getting more money.