{
  "manageEntity": {
    "action": "Save",
    "entityId": "743401348",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x7318869d8797678f85df333cf779163138fe3c603ae3a3c53625d69860571f0c",
    "signature": "0x0025831df2536ff654a35d12c7810a8b4571d339dcb1dd4d64c90a43d4e67f895157e193936eb2f684f16567eadf6f68751db7223737de891cd8ba96256cbfe01c",
    "signer": "0x9c1a2996a6DCe12e947BD7C8A755b6150A3eD5f4",
    "userId": "474113241"
  }
}