backport: bitcoin#20237, bitcoin#24417, bitcoin#24864, bitcoin#25911, bitcoin#29561

contrib/seeds/.gitignore

@@ -0,0 +1,2 @@
+protx_list.json
+asmap-filled.dat

contrib/seeds/README.md

@@ -3,10 +3,12 @@
 Utility to generate the seeds.txt list that is compiled into the client
 (see [src/chainparamsseeds.h](/src/chainparamsseeds.h) and other utilities in [contrib/seeds](/contrib/seeds)).
 
-The seeds compiled into the release are created from the current protx list, like this:
+The seeds compiled into the release are created from the current protx list and AS map
+data, like this:
 
 ```bash
 dash-cli protx list valid 1 2018966 > protx_list.json
+curl https://bitcoin.sipa.be/asmap-filled.dat > asmap-filled.dat
 
 # Make sure the onion seeds still work!
 while IFS= read -r line
@@ -16,22 +18,10 @@ do
   nc -v -x 127.0.0.1:9050 -z $address $port
 done < "onion_seeds.txt"
 
-python3 makeseeds.py protx_list.json onion_seeds.txt > nodes_main.txt
+python3 makeseeds.py -a asmap-filled.dat protx_list.json onion_seeds.txt > nodes_main.txt
 python3 generate-seeds.py . > ../../src/chainparamsseeds.h
 ```
 
 Make sure to use a recent block height in the "protx list" call. After updating, create a PR and
 specify which block height you used so that reviewers can re-run the same commands and verify
 that the list is as expected.
-
-## Dependencies
-
-Ubuntu, Debian:
-
-    sudo apt-get install python3-dnspython
-
-and/or for other operating systems:
-
-    pip3 install dnspython3
-
-See https://dnspython.readthedocs.io/en/latest/installation.html for more information.