{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x6f3748025d582b5ea00ba90d73366f2185c2dfaef5f0cafca8c2a4922ea52aca",
    "signature": "0xad1d30bb490b3179100ece1c8e440220c5dc3086fe69f761c004a77a6c3f000e2d0d7bc16c500b0fafd837832c3083f7a6bf2d14e69ec21e73afe1696bb425e61c",
    "signer": "0xedfD58D5d082Ce843F3f84B08f027aB709BaA5f5",
    "userId": "386423139"
  }
}