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: cdb3de1a02836ad7aed816ac9c6245b5dcc2b41345865b7ae3026a29ac290758 cast-member-ballot name RichyT address 1BRvGQ1STfjHQny8W8Njxay83AxrFYbRxf by Peter_R answer accept
Signature:
IPaPY9+8sb3D+GeKijrPpnnXt9ZxKhm8oN/cPcl20SMeM8j2g1xdfJiSUgG78CRV7wsW3R3GArwmb+xUWpkJ6KQ=
This signature is the base64-encoded Bitcoin-signature of the above action string, signed with this action author's Bitcoin address.