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.

tests/blocks/pivx_testnet_1000.json

@@ -0,0 +1,13 @@
+{
+  "hash": "f593fd5acdcfd74427315d10ecbf64e4cd61b8212524d4efaf1996df27f04b69",
+  "size": 482,
+  "height": 1000,
+  "version": 8,
+  "merkleroot": "f08a6baade71d02dd56e245956abaf13ea1cbde28a35264dda9aa472b0aaed9d",
+  "tx": ["ed36caa75b195b7ecbef51fc3577ea55bf9e3483416c7e4b66d851b5778e9902", "b718c63b33bdf9fab88fe2006f3d3e6d0733717656a9f38784ab9278c8fbe1d4"],
+  "time": 1608265980,
+  "nonce": 0,
+  "bits": "1b039118",
+  "previousblockhash": "5a6a37c9aa62972936fc06f4cedde941122238a778c93db70c7aa5ca00455021",
+  "block": "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"
+}