The usual solution for this is that the data must be signed by a specific private key; possession of that key grants write permission. A generation count or timestamp is embedded in the signed data to ensure that newer data cannot be replaced with obsolete data. Malicious nodes can still block updates from being distributed, though, so you need more than one path to seed the data into the network.
The usual solution for this is that the data must be signed by a specific private key; possession of that key grants write permission. A generation count or timestamp is embedded in the signed data to ensure that newer data cannot be replaced with obsolete data. Malicious nodes can still block updates from being distributed, though, so you need more than one path to seed the data into the network.