* [bitcoindev] [BIP Proposal] Peer Feature Negotiation
@ 2025-12-19 9:13 Anthony Towns
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From: Anthony Towns @ 2025-12-19 9:13 UTC (permalink / raw)
To: bitcoindev
Hello world,
I've been thinking recently about a few ideas that would benefit
from new p2p messages, namely template sharing [0], updating the
bip324-one-byte-message-types [1], and sharing recent stale blocks [2].
That's made me want to make sure that we've got a good way of negotiating
new features, and revisiting the ideas from the 2020 thread [3] has me
still liking the "FEATURE" message idea [4].
As such, and with Ava's recent exhortation that everyone should be
writing BIPs [5] in mind, I've written a BIP:
https://github.com/ajtowns/bips/blob/202512-p2p-feature/bip-peer-feature-negotiation.md
Sample code, though that part isn't really very interesting:
https://github.com/ajtowns/bitcoin/commit/80301f0040fe6048a85b89d0fdf0ffcca836a1d0
The BIP is perhaps a bit over-engineered at this point for what it does,
but I figure better to be over-engineered than under-. And in any event,
there was some degree of breakage with the SENDADDRV2's deployment [6,7]
which would be good to avoid repeating. In any event, the BIP text has
a bunch more background, etc.
Comments welcome.
Cheers,
aj
[0] https://github.com/bitcoin/bitcoin/issues/33691
[1] https://github.com/bitcoin/bips/pull/1378#discussion_r2585766526
[2] https://github.com/bitcoin-data/stale-blocks
The idea behind sharing stale blocks (or headers) more proactively,
is it better insight into the orphan rate, and whether hashrate
is extending the chain vs potentially creating a reorg; and also
potentially makes syncing to the new tip after a reorgs more
efficient, as you'll have already downloaded the parent of the new tip
[3] https://gnusha.org/pi/bitcoindev/CAFp6fsE=HPFUMFhyuZkroBO_QJ-dUWNJqCPg9=fMJ3Jqnu1hnw@mail.gmail.com/
[4] https://gnusha.org/pi/bitcoindev/20200821023647.7eat4goqqrtaqnna@erisian.com.au/
[5] https://x.com/btcplusplus/status/2000489894515253529
[6] https://github.com/btcsuite/btcd/issues/1661
[7] https://github.com/bitcoin/bitcoin/pull/20564
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