From: Gleb Naumenko <naumenko.gs@gmail•com>
To: bitcoin-dev@lists•linuxfoundation.org
Subject: [bitcoin-dev] Low-bandwidth transaction relay
Date: Mon, 2 Apr 2018 15:18:07 -0700 [thread overview]
Message-ID: <9ab6e32e-db51-4ce4-8f3c-3a77f7b1f9bd@Spark> (raw)
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Hi all,
I have a couple of ideas regarding transaction relay protocol and wanted to share it with and probably get some feedback.
I did some emulation and simulation and found out that around 90% of INV messages sent by public-IP nodes are idle (duplicate), obviously because each node creates 8 connections. I also realized that sending INV messages is a significant part of the overall bandwidth consumed by a public-IP node. At a larger scale, this will result in people not able to run a public-IP node.
My idea is in some sense similar to BIP37 but applied to public-IP nodes. Here I want to emphasize that all the nodes will still receive *all* of the transactions. A new protocol should also keep the same zero-trust, robustness, decentralization guarantees and latency.
Idea: while joining the network, a new node agrees on some filter with each of 8 nodes it connects to. So that NewNode <-> Node_A will be used to relay only a subset of transactions, NewNode <-> Node_B for another subset. This will significantly decrease the redundancy.
To keep the guarantees, I would keep some redundancy (for example, each transaction INV is sent over 2 links).
To make it robust to attacks, I have 2 extensions in my mind:
1. Set reconciliation (for a subset of transactions) with *other* nodes. Getting a bloom filter of a subset of the mempool transactions from Node_B may help to figure out whether Node_A is malicious, very slow, etc.
2. Rotating the filters every N minutes (N < 10)
I can see some issues with latency here, but I believe this problem has a solution.
Feedback is appreciated!
If you want to look at a draft of the proposal — please let me know.
If there were any similar ideas — please let me know.
Best,
Gleb
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next reply other threads:[~2018-04-02 22:18 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-02 22:18 Gleb Naumenko [this message]
2018-04-03 17:45 ` Jim Posen
2018-04-04 2:10 ` Gleb Naumenko
2018-04-03 19:05 ` Gregory Maxwell
[not found] ` <CAAS2fgSYG+jrLM4=DXVpLTh9diMEbX0gWG-wC0-2gBRio+Lo0Q@mail.gmail.com>
2018-04-04 4:55 ` Gleb Naumenko
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