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: 5776292860f8c233038833f18c8d4eaaab686efc9dc721265df14d3fde9f2efb cast-member-ballot name JettScythe address 18EChYmw66RLTvRqUYLSp6Ggh9Qt8edzto by imaginary_username answer accept
Signature:
IChAAyABQQUwgXVWBca2egFsIHK19t77DXY+bZQ0eo2xZ/sbU2Vz11b2gF32GtmQ4S/rEt1w1jzTKJnjni046OM=
This signature is the base64-encoded Bitcoin-signature of the above action string, signed with this action author's Bitcoin address.