[Electrum Releases Version 4.8.1 to Fix Critical Security Vulnerability, Users Urged to Upgrade Immediately] Bitcoin wallet Electrum has released version 4.8.1, with the official announcement stating that this update includes 'critical security fixes' and urging users to upgrade as soon as possible. Developers involved in reproducible builds have provided independent signatures for the binary packages on the download page to verify the consistency between the release package and the source code.