{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x38ea7c7850457ed313a47261b78f7b22337d056088816fcd85cd8b2872c864c6",
    "signature": "0x62a645fb7c83e5e0535e9e3b36b54c485bf4eb3bb463f77916fc0f40f1205e6705bec904e8bda91df65bd24c977caeb686fc9c12ad77191d6a646e9d03d485561b",
    "signer": "0x6C603f7E74256e0083E35A55452e579683D3853C",
    "userId": "258645179"
  }
}