{
  "manageEntity": {
    "action": "Save",
    "entityId": "821314529",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5d67fb079ae78856ae8470d9e424bc9e471733bce6c04b2d2c2123b29e6501f5",
    "signature": "0xe19d58c03d1740972e4b932c32f91df70f2fa4dac8b236cd2eab4b4e938fe05b4ed1e4e8167e5fd414c510b8b273342cc769503b86aacd9eb96a842ab28ce4fd1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}