{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8b3817656ea31d5d40b37b2de9896341d15adc6884747c49fd48f5e97b5c08ca",
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    "signer": "0x64888D03Da93901A9ce859716E8D5E9ECCcD9DFe",
    "userId": "169107670"
  }
}