{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x6f6df31d721a01c9c931a259dbaaf679bc20fc33faf2038ade9003be2bb455e2",
    "signature": "0x0ca7c94145bf38740e3714d67fab08fcc52aae8a92fd142ced01d06d5ca4a7f60f0b8152c8f0a9d374ff94a9061b4338622b6ff1cbab20e32305ffc45f6dd6451b",
    "signer": "0x7F7038819176d30f877ED9a42633Ef96354eB386",
    "userId": "678533360"
  }
}