{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4b0458a3c3c3f7ca031ef67c36cd98d74f8e50c8ad869766c3954b8169b6961c",
    "signature": "0x715a444cda9cc13a6dc1e1d0c69edf66cab24f4077afb443f8a817f10b66ba2e5dc3b43a0229a8c9a1949fa604498626f0540041f58e5c74097750dca5b6d9701c",
    "signer": "0x9b682c779356138D1D188CAB373b0F44a2d43d09",
    "userId": "512022848"
  }
}