{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xf74716a1befecc1f35a9cc4c2a31dc3310ce6252733bd0f7f5c6985c229c40d5",
    "signature": "0xe22f81e1bd5bbb2de66a33770bee3c0541a2c796d3e2a61ab3cb9986951f0f3253bbee91d51fa6a8f7ca802d795b252985af28043a73ce968478b0affeaa3ac41b",
    "signer": "0x946F0aCd9CD0376925ba9Adb8da9e219f86b8AF3",
    "userId": "78848634"
  }
}