Get definition

const address = 'TMWNLXR42CKIP4A774BQGNVBZAPHY7GH';
​
client.api.getDefinition(address, function(err, result) {
  console.log(result);
});

[
  'sig',
  {
    pubkey: 'AsD2GQ3+CSHfFO9CfX8+gBxmxSm9TGweKjWVie0rt/0p'
  }
]