external lookup

$ bin/browserid-lookup.js -f login.persona.org -v gmail.com
debug: fetching well-known from gmail.com for principal gmail.com
elapsed_time.fetch_well_known.error: 119
debug: fetching well-known from login.persona.org for principal gmail.com
elapsed_time.fetch_well_known.success: 1875
debug: login.persona.org delegates to gmail.login.persona.org
debug: fetching well-known from gmail.login.persona.org for principal gmail.com
elapsed_time.fetch_well_known.success: 3455


gmail.login.persona.org is authoritative for @gmail.com email addresses: {
  "publicKey": {
    "algorithm": "RS",
    "n": "25988362055076866892053503789328270715943226983956719298521224060565918336198253890188460816164217802083268784275377705880910026413611218619191323255607460452221202683613428040461587402337202413193824640116245877360726450091526225026526701938299302025841766927172440979261238480756886707014705854936148121887052151488660610642915689552199984602572326538004501466997863211833109160452705433542226738659649847805988221272065342700243104021826283957696889717168298329084941952340540096911862261142655293425139304910606122914571830769320588891983729251895400686237980020782222355646761424739685625490008009631835489286051",
    "e": "65537"
  },
  "delegationChain": [
    "login.persona.org",
    "gmail.login.persona.org"
  ],
  "authoritativeDomain": "gmail.login.persona.org",
  "urls": {}
}