Initial commit: snapshot of spesmilo/electrumx 2.0.0

Unmodified source tree of upstream commit 280cb339aa158e099eb936033eecd15719770651
("Merge pull request #389 from SomberNight/202607_release_2_0",
https://github.com/spesmilo/electrumx, release 2.0.0, 3 July 2026).

All Palladium-specific changes are in the commits that follow.

contrib/raspberrypi3/run_electrumx.sh

@@ -0,0 +1,35 @@
+#!/bin/sh
+###############
+# run_electrumx
+###############
+
+# configure electrumx
+export COIN=Bitcoin
+export DAEMON_URL=http://rpcuser:rpcpassword@127.0.0.1
+export NET=mainnet
+export CACHE_MB=400
+export DB_DIRECTORY=/home/username/.electrumx/db
+export SSL_CERTFILE=/home/username/.electrumx/certfile.crt
+export SSL_KEYFILE=/home/username/.electrumx/keyfile.key
+export BANNER_FILE=/home/username/.electrumx/banner
+export DONATION_ADDRESS=your-donation-address
+
+# connectivity
+export HOST=
+export TCP_PORT=50001
+export SSL_PORT=50002
+
+# visibility
+export REPORT_HOST=hostname.com
+export RPC_PORT=8000
+
+# run electrumx
+ulimit -n 10000
+/usr/local/bin/electrumx_server 2>> /home/username/.electrumx/electrumx.log >> /home/username/.electrumx/electrumx.log &
+
+######################
+# auto-start electrumx
+######################
+
+# add this line to crontab -e
+# @reboot /path/to/run_electrumx.sh