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This example is interesting in that it sheds light on the true cost of running a cryptocurrency node. In the normal case without hackers a transaction takes up about 300 bytes. Each transaction must reach each node in the network. Each node will have to receive it and will receive it once, so on average each node will send it once. So a node will use about 0.3 GB of bandwidth to process a million transactions. At the Digital Ocean rates this will cost the node operator $0.003. So even if there were a million nodes, the total bandwidth cost to process one transaction would still be a fraction of a penny. These costs would be at data centers, and would be higher in residential locations. Don’t run a node over a cell service!