{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x6eaaa8f7ff92d0a539ef36f33186d26cff8cb1513ab1729980fe385911d4e0ee",
    "signature": "0x40a74707ec63621ff50c12cc09f98c16143591a93fc73ad088c53e227b2ba4ea2c4c99337b95e81308304a4247ec121461c5e72f7bda75ec0ab9eb24bb6532051c",
    "signer": "0x20535D7624382E7F195D0dB88bf0330b5969415d",
    "userId": "304953428"
  }
}