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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?
What increases a node's banscore?
Answers
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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
That's good that they're punished for sending invalid transactions, that way there can't be any lazy nodes out there. – Geremia – 2016-06-27T21:49:26.463
does broadcasting double spend transaction also increases the banscore ? thanks – AMB – 2017-09-04T07:58:15.220
No, it doesn't (see https://bitcoin.stackexchange.com/a/28159/3041)
– cpsola – 2017-09-05T10:57:28.297