{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xad75567d95e7e8e425995ab23142a97a039adbf9235d15144291dd0cada250a2",
    "signature": "0xe772de2bfdd2dbb1eddf66c91320e98199aff4ca2e96aaba32a2c105d991c79b046c38efc8c69372cfaea5cb30913b2205ece869c7bfe58f4a64c778f325c7691b",
    "signer": "0xDC9FB11483106d427BaC29ff4bf0E03f11b4e19E",
    "userId": "5500"
  }
}