{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x94e0b29e4c2a601976066a6ca619f0ee641335d004692edc43c0afdc975af579",
    "signature": "0x87f3c60149ce075684e557c85b55c1b12ebabb0ca54466f81d8b54fb9b5c5dc46b0d027a3f7a05b0101c85e321b811ec1d7a0f272c1ee97358133601d662ab051c",
    "signer": "0xdBdc477B63C29EFC86BC37eAc5c331EA0C6E0d59",
    "userId": "903413427"
  }
}