{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xff6e5b049f44d717f2493f8a81635cd6ab6cc7f4822a94af6e09c3c177f0b050",
    "signature": "0x1fc150063bea64c6818b9f8fd3299f9aaeb8f331ffd8c40ba2dfdd110831113832dfaf26808ceacee0443a8e26b477cc217d7208be58fae664b44620d8013daf1c",
    "signer": "0x66Af47B6C13Bd2B959f900f7195F8FCad842c6b3",
    "userId": "154727212"
  }
}