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: 242bbdbc67846623368b9d1fae050d6815f1942093617033be4db57ffe21c9e0 cast-proposal-ballot vote a820db1c5a191c3f819c7d233466f2c4dec9bf4a9690fd096f4fb1f3dfbf89db by Peter_R answer (reject)
Signature:
HxSFcke6ctXfHQ3n4AN96WOwI6quhOXK0ooV+aC1F2WNosf4DdblcUsm3wsX4TrI44cNccgWWhkqc5laQHm6kuU=
This signature is the base64-encoded Bitcoin-signature of the above action string, signed with this action author's Bitcoin address.