Abstract: A method for a renewable energy generating system is provided. The renewable energy generating system includes the following steps: —determining, by a first energy meter, a produced energy amount of the renewable energy generating system in the predetermined period of time; —verifying the produced energy amount of the renewable energy generating system in the predetermined period of time; —issuing, by a computing unit, an energy certificate for the renewable energy generating system for the predetermined period of time, where the energy certificate at least comprises a time stamp indicating the predetermined period of time, an identifier indicating the one or group of renewable energy generators having produced the energy amount, and the produced energy amount; —encrypting, by the computing unit, the energy certificated; and —adding, by the computing unit, the encrypted energy certificate to a block of a blockchain or a distributed ledger application as a digital output.

Abstract: The invention relates to a system (10) for controlling a water landing of an aircraft comprising at least one detection device (12, 14, 16, 18), which is adapted to detect at least one signal suitable for recognizing an imminent water landing of the aircraft. A control unit (20) is adapted to receive the at least one signal suitable for recognizing an imminent water landing of the aircraft and to evaluate said signal on the basis of at least one predetermined recognition characteristic that characterizes a water landing of the aircraft. The control unit (20) is also adapted to control a closing device (24) associated with an opening (22) in such a way that in the event of a water landing of the aircraft the entry of water into an interior area of the aircraft through the opening (22) is prevented if the control unit (20) recognizes that a water landing of the aircraft is imminent on the basis of the at least one signal and the at least one recognition characteristic.