{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xdcfdd365e45a49b6ffcd78f07e172325c585f37b8a5845f1807c9037b2abb5b2",
    "signature": "0x374e0b7fb21c03a52b16dd1ca4e376112f974f2764603a945300adfb61f25f487d700863af4aaae4214b0cb21f9b3f60f32f420b6dd3e61522925a487514380e1b",
    "signer": "0x0381Ca46367DAC381887197413DAbeE96f21ccf6",
    "userId": "664008331"
  }
}