{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x009ccc8da3363df54b3de2789859b38eeb3faea7bfcffc333df8e33e18aedcf5",
    "signature": "0x07be52df7e76b36e84c56ecb94b3a0f9e50bc4e0dbeb7b50ddaf4946b7ab92a4343142e9c9cba6695d8bffe5d2df79571949c6ef708cc984916bd94c144aebf71b",
    "signer": "0x0b5154bA4A70cE61CC119fa2cc8f7e52c84586b0",
    "userId": "678598071"
  }
}