Does your protocol do any NAT traversal if the bridge is stuck on an IPv4 network or behind a firewall that doesn't allow inbound? Like if I have two bridges, will traffic go point to point between them or does it have to visit Helium's servers?

Also I'm curious about this distributed system. Is it based on a DHT, a meshnet protocol, some kind of distributed database, or something else? Or is it something simpler than that that lives in the cloud?

I guess I'm wondering if you've gone into the realm of truly decentralized networking or whether this is a cloud-based service.