I think your thought goes in a wrong direction- all the VPN-traffic 4sure goes trough without any blockchain entry anonymously, the blockchain only randomizes the VPN-tunnel-system in a uncrackable way from a cloud of potential nodes to let the traffic flow to a bunch of randomly selected nodes which are defined trough blocks in the chain. No traffic/content from the tunnel will be ever written into blockchain - lol - guess nobody wants to have his secret (=content in VPN-tunnel) data written in a blockchain. Maybe i got it all wrong, if so can happen, we are all learning