{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x6a1d018df48cbe0aa8fd288cc7dc6385099ea3561ebe88c47d61617f4042895a",
    "signature": "0x621aa256dc53d541c7bbeaa90637d90d27d08817a1965ecfce32ff5585d567992c40edd0a5d4cd1963a8bd7cae1fea426bb9615778dda48ad82f93f3d3ca13541c",
    "signer": "0x42ad36888200ADA907d907B61D48E2B24Cfa3Dae",
    "userId": "500178575"
  }
}