{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x66dd3671457823f1f290cafe8712e2ad3e0b06f3fee2a7b1b5a0d1418dc42e00",
    "signature": "0x99704a4782a31bc2f68fb735df088a71320a3c025e2287c9573153210af2c9462c059f1a4679d625ad3d2a8bada885f9da9e2c1e6edb862d981af7d5a8c343de1b",
    "signer": "0x7a3b33afbBf9762d6309Cf2e1a4910e4c4EAA6f9",
    "userId": "65846854"
  }
}