{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x669071c917f08fd5c4b2fbfc8d90fed5836e4b17fedc9bb1d8d250f8922d40c7",
    "signature": "0x9d04f12432d41601e960d9c13c218987e496359b523e496aaf979202970c47b0756bdae7768706bdbf229bf2d4196e4f6716752a26bc37070c101316535cf5e81c",
    "signer": "0xbdd4C00fE4A55d069F02fcFCEF5C8f5Ad2cF6E03",
    "userId": "977266626"
  }
}