{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x55325fe8316772853da4cfae4349ef34f1ef0615076f47ca34721a7bc10776e5",
    "signature": "0x052a792e6a50a9664195476c67975f00ef673124ae1ba379c6518c51ff7a35234d88eac7e59f7327d56b092b04f42953df8cb8adc44dfb2edb447ab3a3adfac91c",
    "signer": "0x9d4b9d6c08f13bdD52f5B6Cb488a70DC2819e2de",
    "userId": "540238713"
  }
}