const useCapture = true; // capture, bubbling: false
var elem = document.getElementsByTagName('button')[0];
elem.addEventListener('click',keygen,useCapture);

function keygen(ev) {
 console.log('keygen: %o',ev)
 let name = document.getElementsByTagName('input')[0].value;
 let namep = name.replace(/ /g,'+');
 let url = api_url + `keygen?name=${namep}`;
 let data = fetch(url).then(resp => resp.json()).
    then(obj => {
      let tarea = document.getElementsByTagName('textarea')[0];
      tarea.innerText = JSON.stringify(obj.identity);

      console.log('keygen.obj.keys:',obj.keys);
    }).
    catch(console.error);
}