code: function(chain_id) {
  
          let i, len, network, network_name, ref;
          ref = Object.keys(_this.networks);
  
          for (i = 0, len = ref.length; i < len; i++) {
  
              network_name = ref[i];
              network = _this.networks[network_name];
  
              if (network.chain_id === chain_id) {
  
                  _this.network_name = network_name;
  
                  if (network.address_prefix) {
                      _this.address_prefix = network.address_prefix;
                      ecc_config.address_prefix = network.address_prefix;
                  }
  
                  // console.log("INFO    Configured for", network_name, ":", network.core_asset, "\n");
  
                  return {
                      network_name: network_name,
                      network: network
                  }
              }
          }
  
          if (!_this.network_name) {
              console.log("Unknown chain id (this may be a testnet)", chain_id);
          }
  
      }
docs: Set a few properties for known chain IDs.