{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x1d4a596acddfe27ffd678d4c1ac716632d381665441bc4bd300af3d48358f673",
    "signature": "0xd001894b491f5ee8a593e92ceb2972db11a4bca941cd074bc04e207c4281cdaf6b41128f23e5c32c9290bd33511fa0db3859923f524bcd4512519d52f7ba66cb1b",
    "signer": "0x715aC89F33666691AD0BebeB284C380aBa10caF1",
    "userId": "700531368"
  }
}