{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x3bcf8965b1484a87d78dad5b0457dbbac882eb9bfe04d9b046736f999264be6d",
    "signature": "0xf3dce3de6d9753df762fc002eb1a0117fcc85c32fd72a008af05fd607d1e46506acaabaed349665b26469e24bed1ce558aa81590777ce0fc3819e2a0e30ed6141b",
    "signer": "0x6a1eCc7128689c85Fc7aCB2BEf73235E1C4d1B1c",
    "userId": "433876618"
  }
}