{ resolution_type: GETDNS_RESOLUTION_STUB
, dns_transport_list: [ GETDNS_TRANSPORT_TLS ]
, tls_authentication: GETDNS_AUTHENTICATION_REQUIRED
, tls_query_padding_blocksize: 256
, edns_client_subnet_private : 1
, round_robin_upstreams: 1
, listen_addresses: [ 127.0.0.1, 0::1 ]
, idle_timeout: 10000
, upstream_recursive_servers:
  [
    { address_data: 31.130.229.6
    , tls_auth_name: "services-1.meeting.ietf.org"
    , tls_pubkey_pinset:
      [ { digest: "sha256"
      , value: 0x9e87f6ab22ea453f2f7eaeb7150538394c8dd2ece69fa3c96442957c87366fb6
      } ]
    } 
    , { address_data: 31.130.229.7
    , tls_auth_name: "services-2.meeting.ietf.org"
    , tls_pubkey_pinset:
      [ { digest: "sha256"
      , value: 0xa9df4b07c0045843669d5d3e6ddbe40a31bce7245edfabc66761a851b21c765b
      } ]
    } 
    , { address_data: 2001:67c:370:229::6
    , tls_auth_name: "services-1.meeting.ietf.org"
    , tls_pubkey_pinset:
     [ { digest: "sha256"
     , value: 0x9e87f6ab22ea453f2f7eaeb7150538394c8dd2ece69fa3c96442957c87366fb6
     } ]
    }
    , { address_data: 2001:67c:370:229::7
    , tls_auth_name: "services-2.meeting.ietf.org"
    , tls_pubkey_pinset:
     [ { digest: "sha256"
     , value: 0xa9df4b07c0045843669d5d3e6ddbe40a31bce7245edfabc66761a851b21c765b
     } ]
    }
  ]
}