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The validator that proposes the block with the slashing in it gets a small reward, while the rest is burnt. There are dedicated slashers on the network that observe attestations and block proposals for violations. They can either selfishly keep those observations until they can be included in a block, or broadcast them to the network so whoever is up next for proposal can slash the misbehaving validator. The whistleblowers themselves (altruistic slashers) get no reward, only the validator including it in a block does.