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Yes winners are selected randomly, but weighted by Bitcoin balance. The more BTC your address holds, the higher your chance of being picked.
The reward is provided by the event creator.
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You don’t have to offer a reward, but in practice, participation is much higher when there is one. As for weighting, it’s mainly to prevent Sybil attacks. Without it, someone could split their BTC across many addresses to farm rewards.
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Is the winner picked randomly? Who pays the reward?