The concept of a blockchain "dark forest" has been popularized recently by Ethereum and the existence of front-running bots that will copy any profitable transaction pending for submission.
The bots are able to assess if any given transaction that just entered the mempool can be replicated, and they will immediately publish their own copy with a much higher gas fee, which virtually guarantees that they will be the first to claim it. The term "dark forest" is inspired from a sci-fi novel and indicates a place where detection means instant death — or in this case loss of funds.
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