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}!ä8© L¶Just a half baked idea: Suppose you have 2^n tickets, to receive a ticket one would provide an encrypted n bit number, and after last ticket is bought decryption keys are provided...
https://whatsonchain.com/tx/770b3b5441ac6c955c2f4bb6bb975ee4e9842592c0826ee08f4d9fddf9090c3f