 class='op'>=&gt;</span> <span class='symbol'>:&#39;Boolean&#39;</span><span class='comma'>,</span>
    <span class='symbol'>:&#39;activation_epoch&#39;</span> <span class='op'>=&gt;</span> <span class='symbol'>:&#39;String&#39;</span><span class='comma'>,</span>
    <span class='symbol'>:&#39;exit_epoch&#39;</span> <span class='op'>=&gt;</span> <span class='symbol'>:&#39;String&#39;</span><span class='comma'>,</span>
    <span class='symbol'>:&#39;withdrawable_epoch&#39;</span> <span class='op'>=&gt;</span