{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x099ba65ab1904452d5da303f707af9adefdb17da30f92ffeaf6335b3b4dad8d8",
    "signature": "0x7a8c975edf4ba211f5dd5999c00225fcc2a101b3f7889c22765d0f0e33c96c3d41140882a2357e3be0e21cf94a15fea68d558a8a9e9c67c809cb4b5ac6af5da91c",
    "signer": "0x7907d383F4014cbF03A1adDc700F44eB3ae99E7b",
    "userId": "205859716"
  }
}