{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb5ba4a7bfbd7e9bdea9d7b3d80757804232fb2e21b9546b08af466c93cdbc233",
    "signature": "0x2bf0572663d947e1a5b4f4fbfad05fb5f7216e212326d47c66fb2c1f40051764286632dbfe8e25a5590ab8d9045248521bc67b58800e158009bb9e095cff1edf1c",
    "signer": "0xFD3B3ad6c8365DFBCf1dB1a67131B23bcB1aEA16",
    "userId": "56543560"
  }
}