Hi,

Proof of Transfer in the context of filefilego is a type of verification concensus algorithm that allows the network to verify some data from 2 untrusted nodes were exchanged successfully without trusting those nodes at all.

This is not a consensus mechanism to mine or validate. In FileFileGo storage providers can ask for an x amount of coins when they serve data to other nodes. The algorithm that verifies this process is our proof of data transfer, which mathematically proves that data from storage node were transmitted to the downloader node.

Let me know if you need more clarification