Re: [bitcoin-dev] Removal of reject network messages from Bitcoin Core (BIP61)

[Aymeric Vitte <vitteaymeric@gmail.com>]

Bitcoin-transactions did use this "feature", but does not rely on it any
longer since I observed some strange behavior sometimes (no reject
message for bad tx, with suprnova for example as far as I remember),
then it doublechecks using getdata to see if the tx is in mempool

Indeed you can't trust what a node tells you with or without reject
(idem for getdata but more difficult to fake and better than nothing)

Then I don't see any problem to remove it, taking into account also that
the error message is too vague to be really helpful
https://github.com/bitcoin/bitcoin/issues/11891

Le 06/03/2019 à 01:53, Marco Falke via bitcoin-dev a écrit :
> Bitcoin Core may send "reject" messages as response to "tx", "block" or
> "version" messages from a network peer when the message could not be accepted.
>
> This feature is toggled by the `-enablebip61` command line option and has been
> disabled by default since Bitcoin Core version 0.18.0 (not yet released as of
> time of writing). Nodes on the network can not generally be trusted to send
> valid ("reject") messages, so this should only ever be used when connected to a
> trusted node. At this time, I am not aware of any software that requires this
> feature, and I would like to remove if from Bitcoin Core to make the codebase
> slimmer, easier to understand and maintain. Let us know if your application
> relies on this feature and you can not use any of the recommended alternatives:
>
> * Testing or debugging of implementations of the Bitcoin P2P network protocol
>   should be done by inspecting the log messages that are produced by a recent
>   version of Bitcoin Core. Bitcoin Core logs debug messages
>   (`-debug=<category>`) to a stream (`-printtoconsole`) or to a file
>   (`-debuglogfile=<debug.log>`).
>
> * Testing the validity of a block can be achieved by specific RPCs:
>   - `submitblock`
>   - `getblocktemplate` with `'mode'` set to `'proposal'` for blocks with
>     potentially invalid POW
>
> * Testing the validity of a transaction can be achieved by specific RPCs:
>   - `sendrawtransaction`
>   - `testmempoolaccept`
>
> * Wallets should not use the absence of "reject" messages to indicate a
>   transaction has propagated the network, nor should wallets use "reject"
>   messages to set transaction fees. Wallets should rather use fee estimation
>   to determine transaction fees and set replace-by-fee if desired. Thus, they
>   could wait until the transaction has confirmed (taking into account the fee
>   target they set (compare the RPC `estimatesmartfee`)) or listen for the
>   transaction announcement by other network peers to check for propagation.
>
> I propose to remove "reject" messages from Bitcoin Core 0.19.0 unless there are
> valid concerns about its removal.
>
> Marco
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