{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0d20f0b03eabe9d4cb427cbbf04e0fccafb9088e1af37d6660ab109f3eef92fd",
    "signature": "0xf1f44e755f518edcbdae29cdf100d1493b7b6efcd1470b56c337469ec7b285cb6b76c2f88014b425cfc51fea79aa32503bea7f203b03ae36ff5907aea1e3a0b81b",
    "signer": "0x9D360ECE27645E249fbb45fC03AeF953A81031Dc",
    "userId": "579726392"
  }
}