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.

.gitignore

@@ -0,0 +1,19 @@
+**/__pycache__/
+/.cache/
+/.pytest_cache/
+*/*~
+*.#*
+*#
+*~
+/docs/_build/
+/build/
+/dist/
+/venv/
+/.vscode/
+/.mypy_cache/
+/.idea/
+
+/src/electrumx.egg-info/
+/src/e_x.egg-info/
+/electrumx.egg-info/
+/e_x.egg-info/