Payloads are received via a communication channel having one-way connectivity. The payloads have a container structure that includes a time stamp. It is determined whether a unit manifest has been received via the communication channel transmitted independently of the payloads. The unit manifest includes information associated with payloads including a hash of each payload on the unit manifest. Responsive to determining that the unit manifest has been received, it is determined whether the information associated with the payloads matches the corresponding payloads. Responsive to determining that the information associated with payloads on the unit manifest matches the corresponding payloads, the corresponding payloads are processed. It is determined whether an aggregate manifest associated with a predefined time period has been received. Responsive to determining that the aggregate manifest has been received, it is determined whether aggregate manifest information from the aggregate manifest matches payloads from the predefined time period.