What increases a node's banscore? What factors contribute to the banscore? Does a node sending bad transactions increase its banscore? Does its using unnecessarily too much bandwidth also increase its banscore?
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There are many facts that can increase a node's banscore. A node's banscore is updated in the Misbehaving function from main.cpp. Some of the reasons that trigger such update are:
- Sending invalid blocks.
- Sending duplicate version messages.
- Not sending first a version message (before other communication).
- Sending addr messages with more than 1000 addresses.
- Sending inv messages with more than 50000 elements.
- Sending header messages with more than 2000 elements.
- Sending too large bloom filters.
- ...
Regarding transactions, it seems that they also may increase the banscore:
// Punish peer that gave us an invalid orphan tx
cpsola
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That's good that they're punished for sending invalid transactions, that way there can't be any lazy nodes out there. – Geremia Jun 27 '16 at 21:49
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does broadcasting double spend transaction also increases the banscore ? thanks – Sep 04 '17 at 07:58
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No, it doesn't (see https://bitcoin.stackexchange.com/a/28159/3041) – cpsola Sep 05 '17 at 10:57
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1Could continuously re-broadcasting a transaction that is already in all nodes' mempools increase banscore? – deezy Mar 03 '21 at 15:38
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@deezy iiuc all nodes are continually re-broadcasting the transactions in their mempools, in order to make sure that their mempools line up with the rest of the network – tjr226 May 03 '21 at 16:11