An action is any change submitted to the voting system, such as
The author of this action is: lunar, 1BpYYT2HQzQdz5CFPM1nehCZd1xWPtNbma
The member list that this action was made for.
The action string, which is the actual "command" part of the action:
bitcoin-unlimited-voting: ba0411a9e0c7f210c553a4272e3d1fb78bad93c5a59d6f8ae566287f151921ad cast-proposal-ballot vote f2705d0a82d933f4bb7768970b78416fdaff71a0f142a528efb8a1b6dfd208a8 by lunar answer (accept)
Signature:
H+6bqlJ+ZSvorKzhs2FJtr8SEvbCxte5V0Y0V0KRqndCQNlKFm6qa+lsPuXbjHTGf/zoc7W46eJepe6BxJOOOlY=
This signature is the base64-encoded Bitcoin-signature of the above action string, signed with this action author's Bitcoin address.