rec {
  peers = {
    "roam" = {
      publicKey = "yUbdRfRFFVe4FPUaD7pVByLRhpF9Yl1kethxRUHpVgs=";
    };
    "solo" = {
      publicKey = "SRDguh0aN/RH8q/uB09w/OZTbP9JZZy0ABowbWIfkTk=";
    };
  };

  peersFor = host: { }; # TODO: return peers.
}