Measuring minrelaytxfee across the Bitcoin network

[1440000bytes]

@danielabrozzoni

I was surprised to see that a large share of IPv4 nodes didn’t send a FEEFILTER. Peter Todd suggested these might be spy nodes. When I checked the IP addresses, I noticed several clusters of about 50 nodes sharing the same subnet, though I did not investigate further.

Some of them might be running version older than 2016 so they cannot send feefilter or disabled fee filter using a version older than 2021 with -feefilter config option.