An action is any change submitted to the voting system, such as
The author of this action is: imaginary_username, 1KNvUAmquf9v2BgyrTsLjE8GdKwu1PaJed
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 sken_ address 12Hdfw24EgY9Akj9UUbKBGPJYVm9J4V2pU by imaginary_username answer accept
Signature:
H65LjK66V3B4dUk3FUXPFP86GMFeqU8Bg8lTvpxC4Dy2HiQjc0zWQEJbpaLHP/5GWL5Pqg8fWc5WJj1vfIhdOyM=
This signature is the base64-encoded Bitcoin-signature of the above action string, signed with this action author's Bitcoin address.