{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4a7468962c6515f4aea2e9dcbc637bc23ec3148fb726cfb1acb566bd73a2b842",
    "signature": "0xac4ac8f8f0ed17e15b50394ec285043eb6e7e1c7e3fd3a46e36f80f197e73c8d3a9061822de9ceed27346b6b1b3177e21365a27c665785032cc408d954d336b41c",
    "signer": "0x2B58D0E25Ee8743190c8Fe1875c801d083066b4B",
    "userId": "301554607"
  }
}