{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5041c55fc0ab44556b171f54cb01f238c350c0562ed02249384f76106a435274",
    "signature": "0x34e33dff7f50e8e43fc9b6869266b650cce02f657605b93b97cd7d01e2fe684765d0d861ec4dd6e9aa6a518b561d6b194019ef8db75089a5366f02b4b6ff47aa1c",
    "signer": "0xf52B71e1c028280A28328A3613CD2341365CC8A3",
    "userId": "357679746"
  }
}