Apostille

// Create a common object holding key
var common = nem.model.objects.create("common")("", "privateKey");

// Simulate the file content
var fileContent = nem.crypto.js.enc.Utf8.parse('Apostille is awesome !');

// Create the Apostille
var apostille = nem.model.apostille.create(common, "Test.txt", fileContent, "Test Apostille", nem.model.apostille.hashing["SHA256"], false, true, nem.model.network.data.testnet.id);

// Serialize transfer transaction and announce
nem.model.transactions.send(common, apostille.transaction, endpoint).then(...)

// Create an NIS endpoint object
var endpoint = nem.model.objects.create("endpoint")(nem.model.nodes.defaultTestnet, nem.model.nodes.defaultPort);

// Simulate the file content
var fileContent = nem.crypto.js.enc.Utf8.parse('Apostille is awesome !');

// Transaction hash of the Apostille
var txHash = "9b2dc096fb55e610c97a870b1d385458ca3d60b6f656428a981069ab8edd9a28";

// Get the Apostille transaction from the chain
nem.com.requests.transaction.byHash(endpoint, txHash).then(function(res) {
  // Verify
  if (nem.model.apostille.verify(fileContent, res.transaction)) {
    console.log("Apostille is valid");
  } else {
    console.log("Apostille is invalid");
  }
}, function(err) {
  console.log("Apostille is invalid");
  console.log(err);
});