{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xceef5c0d70667ec4396481ca32c6dda5017ff9cc1b268fc9cbf9273e18efb662",
    "signature": "0x567ab3824bf525fc410dea7cbc3965bce4956bc6b35605667274dc41992a4c694dea9ebd1c638014ed3b8ce236e478a62c065fc54517b835c6036def4c03d98d1b",
    "signer": "0xd07b5397D5479A6937AF36CeA9Cd643373053AA8",
    "userId": "83631752"
  }
}