{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0c39737db93d562d41f7a9ba905a17e6c29c6bb331e955fb41bab4fc4a2471db",
    "signature": "0x2939d0112d916c9e7850882e62f4e25760163ae0b4644839d4e9e327e696f07358bd1ebc2587f2d90cee6399b04add0faa70b93f7ba424f38cc6522d4b4cb1371c",
    "signer": "0xbfdb427663B03D3d77E033cdf078dEeFa2E718EB",
    "userId": "120921712"
  }
}