{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x1d1234a5f4e000149d9babedf10478489158d9178e8473cb52313daa999d558f",
    "signature": "0x1f5a4133196fdf6d0972f62c58feaa73961517cb68811d8d5cad5a48e20f50e0227f931759e33dff345d8d6bb780b5063b9e7090b93c791ab8278def3995bfa91c",
    "signer": "0x363693A59feAe370750D0B9f2E8bbD445a8b3e28",
    "userId": "392320637"
  }
}