{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4d5980ad92b645b8f163bcd65258830ed37557753d0ea12b342caf5d2d17b6de",
    "signature": "0xca21c1a3e08239b7480be93457c3b041515ed219b80c771ed7c0c24ed9e900766c52661b89d8a354e6fc734f5532da92e08daa97995786c4ffad6c7ecebce2b51c",
    "signer": "0x89a6B1a1b823105476fE21123fb4A43700e8cf28",
    "userId": "172581848"
  }
}