I created this tool to quickly and publicly generate proof keys to show a public live audience such as IRC, slack, discord, teamviewer, etc... that one person is controlling at least two accounts at the same time as only the person will know all three keys.
Instructions are simple: The first account will publicly prompt the first and third keys the second account will publicly respond with the second key the first account will then publicly disclose the private solution in its entirety so that the witnesses can validate the keys easily.
Note: modify as needed for number of accounts, can be easily modified for hundreds if necessary, as well as programmatically witnessed
currently available on github: https://github.com/IsraelTorres/gen-quick-proof-keys

below is an example of manually validating publicly posted keys: