add method to get txids from a specified block

lib/blockchainexplorers/insight.js

@@ -183,6 +183,21 @@ Insight.prototype.getBlockchainHeight = function(cb) {
   });
 };
 
+Insight.prototype.getTxidsInBlock = function(blockHash, cb) {
+  var self = this;
+
+  var args = {
+    method: 'GET',
+    path: this.apiPrefix + '/blocks/' + hash,
+    json: true,
+  };
+
+  this._doRequest(args, function(err, res, body) {
+    if (err || res.statusCode !== 200) return cb(_parseErr(err, res));
+    return cb(null, body.tx);
+  });
+};
+
 Insight.prototype.initSocket = function() {
 
   // sockets always use the first server on the pull

lib/blockchainmonitor.js

@@ -25,7 +25,7 @@ BlockchainMonitor.prototype.start = function(opts, cb) {
   async.parallel([
 
     function(done) {
-      self.explorers = _.map(['livenet', 'testnet'], function(network) {
+      self.explorers = _.indexBy(_.map(['livenet', 'testnet'], function(network) {
         var explorer;
         if (opts.blockchainExplorers) {
           explorer = opts.blockchainExplorers[network];
@@ -44,7 +44,7 @@ BlockchainMonitor.prototype.start = function(opts, cb) {
         $.checkState(explorer);
         self._initExplorer(explorer);
         return explorer;
-      });
+      }), 'network');
       done();
     },
     function(done) {