{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x57b5f616b942403ea4ebfdde00afc08409e01c27ca7b5bbe4e1d450733618691",
    "signature": "0x14cffa8905f4b195d8c0a737833e2ac89362c1862582de50ccf98b9186bed6f45905cd40df43ba1177e357fb675031dc2fbf002f404e3065b7f09f3ee4d26f751b",
    "signer": "0xeF45F8197ccd0c92F9c270D8C58CA6ad53E56792",
    "userId": "352294849"
  }
}