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+---
+Title: Private State Variable Visibility Exposure
+Description: The Prototype builtin contract provides raw access to private or internal storage of all accounts/contracts.
+Author: Kyle L. (@picoAMPERE), Mario Micklisch (@ifavo)
+Discussions: https://vechain.discourse.group/t/add-vip-private-state-variable-visibility-exposure/84
+Category:  Information
+Status: Idea
+CreatedAt: 2023-12-06
+
+---
+
+## Overview
+
+The Prototype builtin contract in VechainThor Blockchain significantly alters the expected privacy of private and internal state variables in contracts. This allows contracts raw access to these variables, undermining their privacy and security.
+
+## Motivation
+
+As an Ethereum developer, private and internal variables are expected to be private within contracts. However, in VechainThor, a public storage mechanism allows contracts to access all state variables of each other. This design poses significant risks in decentralized applications by opening up potential for malicious actors to exploit private data in contracts.
+
+## Rationale
+
+#### VechainThor Prototypes `storageFor`
+
+> [!NOTE]
+> VechainThor uses a custom prototype for all accounts that adds functionality:
+> https://github.com/vechain/thor/blob/master/builtin/gen/prototype.sol
+
+`storageFor` provides raw access to storage of all accounts/contracts. `internal` or `private` definitions are not respected due direct storage access without going thru the contracts code.
+
+Given that situation the modified definition of internal and private read:
+
+> **internal**
+> - Internal state variables can not be access public interfaces to the contract they are defined in and in derived contracts. They can be accessed externally using storage access. This is the default visibility level for state variables.
+
+> **private**
+> - Private state variables are like internal ones but they are not visible in derived contracts. They can be accessed externally using storage access.
+
+## Test Cases
+
+Given there is a contract that accepts payments to roll a dice. The result is a random calculation within the contract. If the user guesses the correct side in advance the pool of money is sent as prize. If failed, the prize pool grows.
+
+Technically the result of the dice roll is stored in a private variable. In a second transaction the prize can be claimed.
+
+Given a bad actor creates a custom contract that checks a private variable for an indicating of a win. If it does not indicate a win, it reverts. Then the following scenario can happen:
+
+```gherkin
+Given a bad actor sends a transaction with two clauses  
+When the first clause (play) rolls the dice and loses  
+Then the second clause (check) reverts the whole transaction  
+```
+
+This can be repeated until it results in a win.
+
+Example vulnerable pseudo-contract:
+```solidity
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.4;
+ 
+contract Dice {
+    uint256 private totalClaimableFunds;
+    mapping(address => uint256) private claimableFunds;
+		
+    function roll(uint256 guess) public payable {
+        uint256 rolled = randomNumber(6);
+        if (rolled == guess) {
+	    claimableFunds[msg.sender] = address(this).balance - totalClaimableFunds;
+            totalClaimableFunds += claimableFunds[msg.sender];
+        }
+    }
+ 
+    function claim() external {
+        uint256 amount = claimableFunds[msg.sender];
+        totalClaimableFunds -= amount;
+	claimableFunds[msg.sender] = 0;
+        payable(msg.sender).transfer(amount);
+    }
+ 
+    function randomNumber(uint256 number) internal view returns (uint256) {
+        return (uint256(blockhash(block.number - 1)) % number) + 1;
+    }
+}
+```
+```solidity
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.4;
+ 
+interface IPrototype {
+        function storageFor(address _self, bytes32 _key)
+             external 
+             view 
+             returns(bytes32);
+}
+ 
+contract Mimisbrunnr {
+ 
+    address private constant PROTOTYPE = 0x000000000000000000000050726f746F74797065;
+ 
+    function getStorage(address _address, bytes32 slot) 
+        internal 
+        view 
+        returns(bytes32) {
+            return IPrototype(PROTOTYPE).storageFor(_address, slot);
+    }
+ 
+    function getMap(address _address, uint256 position, address key) 
+        public 
+        view 
+        returns(bytes32) {
+            bytes32 slot = keccak256(abi.encode(key, position));
+            return getStorage(_address, slot);
+    }
+}
+``` 
+  
+## Security Considerations
+
+#### Oracles to remove processing indications
+  Calculations can be moved away from the Blockchain to prevent any indication of the results.
+- The input emits an Event that is listened by an external party.
+- The external party triggers another transaction that generates processing.
+
+The disadvantage of this are two transactions and an external party:
+
+1. twice VTHO costs
+2. double the processing time
+3. add more complexity to a contract due implementing a pending & processing status
+4. an external service monitoring for events with ability to execute transactions
+
+Copyright and related rights waived via [CC0](./LICENSE.md).