Merge pull request #164 from opentensor/release/4.0.0

Release/4.0.0

Author: thewhaleking

CHANGELOG.MD

@@ -1,5 +1,11 @@
 # Changelog
 
+## 4.0.0
+* make when_created field optional for json file import by @camfairchild in https://github.com/opentensor/btwallet/pull/160
+* Fix hotkeypub by @thewhaleking in https://github.com/opentensor/btwallet/pull/161
+
+**Full Changelog**: https://github.com/opentensor/btwallet/compare/v3.1.0...v4.0.0
+
 ## 3.1.0 /2025-07-07
 
 ## What's Changed