.putty/randomseed in home folder
This file is generally created by FileZilla on macOS. However, that’s not the only app to do so.

Check if you have any other FTP client app or remote file management app. A while ago, on one of our development Macs, I found this file to be created when the only non-bundled app that we installed was Xcode. The last modified time of the file used to change every time Xcode was launched.

It is advisable to delete the file from your Home directory and keep watching the location for any signs of it coming back.