{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x348be58bfd58fc359262c13cdc342cef07555486adc524b81242c80cde7b67b1",
    "signature": "0x3aaef7aecfcc4efaf3f7f0c24c4268bdb42daa5abb4996950abb30d37fa8546a2ae3b0f12f283d23b460323b5aa2be7ed08cdc4e429eb85a336a00b6bbd4fea51b",
    "signer": "0x519048c9adf7EaD727a19998F73c54DA8FC178e8",
    "userId": "598178531"
  }
}