An action is any change submitted to the voting system, such as
The author of this action is: Peter_R, 1BWZe6XkGLcf6DWC3TFXiEtZmcyAoNq5BW
The member list that this action was made for.
The action string, which is the actual "command" part of the action:
bitcoin-unlimited-voting: be3c66388058cc34d9e899e516e8ed808b294bb3d567008f12727ed5d8b5e3c0 cast-member-ballot name xmodulus address 1Cm25eFUNCXrFSHH1vqbXGYcsy9TZGyYGq by Peter_R answer reject
Signature:
H9LGvG7EdKCDKhP2NF5GE1qQrtzsBZ/lXAnnNco/9a4TIXGvHjKHjJuQox8g13nrTwkOw8TZQH+vjeugL5X/MOc=
This signature is the base64-encoded Bitcoin-signature of the above action string, signed with this action author's Bitcoin address.