{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9bc239dccca3ac63db483c29c765733fe9eac080116819ce74918dabf499feec",
    "signature": "0x3f66daa13889b86e1ae805e879e16103d7cd336d33cc39d49b0e3ff1c5ad87bd77e792052d9f3912be011653b4b0571231db6d92d40eaea0345af306210287e91c",
    "signer": "0x03803b915E0AAee5C2c5aA3510FCc5b4DBb0FF46",
    "userId": "629975650"
  }
}