{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xe6dd00276000e9005034e655d6bf612864a074435cb9cf31ade4755ff8b8e120",
    "signature": "0x81f221ac0663a7307e0bb32918993d9047e2cbc32a149f87369257719879a038592c42d1fd132bb1cb7ec92226eff35e5d83ec836fa2a2e83463d70e700b4f131c",
    "signer": "0x3d4F6b88eD197957eDaD572846096bc7B25123e3",
    "userId": "799370811"
  }
}