p2p – Is the `mempool` message reliable?


Full nodes have absolutely no use for the mempool message, it is vestigial from bip35 and has had a history of causing privacy leaks due to its poor implementation. It has previously been used to bypass transaction trickling, or just cause an enormous amount of waste data transfer. Modern versions of Bitcoin Core do not ship with bip37 enabled, which means they will not respond to the message without configuration changes.

It would not be a good solution for attempting to estimate fees regardless, as you would cause potentially gigabytes of transfer of transactions you have absolutely no way of verifying. Estimating fees, by and large, needs to be delegated and there are many APIs for doing so.

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