{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x890dd98e275b2f1b7cf8228eb3dd7d2fb0a074a4db00c7a57aaaf7f1de0c78c3",
    "signature": "0x986ea907c21fed0b47238f516d7a15755e7db0c3fdf40cb3e0c2836e34f7ddad7a0f197f252250d5e513c14174f49fdc7ae27904e03a757c56e59296558f03ae1b",
    "signer": "0x5f3852d015B3133B018eC7fc4a78D57d179a01FB",
    "userId": "469362126"
  }
}