decode method data bytecode, from method ABI object
function decodeEvent(eventObject, data, topics, useNumberedParams = true) {
  const nonIndexed = eventObject.inputs.filter((input) => !input.indexed)
  const nonIndexedNames = utils.getKeys(nonIndexed, 'name', true);
  const nonIndexedTypes = utils.getKeys(nonIndexed, 'type');
  const event = decodeParams(nonIndexedNames, nonIndexedTypes, utils.hexOrBuffer(data), useNumberedParams);
  const topicOffset = eventObject.anonymous ? 0 : 1;

  eventObject.inputs.filter((input) => input.indexed).map((input, i) => {
    const topic = new Buffer(topics[i + topicOffset].slice(2), 'hex');
    const coder = getParamCoder(input.type);
    event[input.name] = coder.decode(topic, 0).value;
  });

  event._eventName = eventObject.name;

  return event;
}