We are still actively working on the spam issue.
Yggdrasil is an overlay network implementation of a new routing scheme for mesh networks. It provides end-to-end encrypted IPv6 routing between all network participants. Peerings between nodes can be configured using TCP/TLS connections over local area networks, point-to-point links or the Internet. Even though the Yggdrasil Network provides IPv6 routing between nodes, peering connections can be set up over either IPv4 or IPv6.
A few questions
Why do I need IPv6?
While Yggdrasil does transport only IPv6 traffic internally, you do not need an IPv6 internet connection to peer with other Yggdrasil users. You can peer with other Yggdrasil nodes over either IPv4 or IPv6.
Yggdrasil is not meant for privacy. Peers will be able to see your IP address and peers and multicast-discovered peerings on the same network will typically expose your device MAC address. If you wish for peers not to see your IP address you can peer over Tor, I2P, or Lokinet.
Why is it called Yggdrasil?
Yggdrasil is named after the mythical world tree of Norse cosmology.