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In the NEAR network, validators have access to the transaction pool, and can therefore see them before they execute. This enables validators to analyze transactions for a potential profit and frontrun them with a transaction of their one.

For example, imagine that you make a game where users are paid for solving puzzles. If not handled carefully, a validator could swap a transaction with the valid answer for one of its own and claim the prize. You can read more about this in this blog post.

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