created example SteamToEtherSafe contract that anonymously links steam and eth wallets.

contracts/SteamToEtherSafe.sol

+//SPDX-License-Identifier: Unlicense
+pragma solidity ^0.8.0;
+
+import "hardhat/console.sol";
+import "@openzeppelin/contracts/utils/Context.sol";
+import "@openzeppelin/contracts/utils/Address.sol";
+
+
+// this is a way to store steam/eth wallet links without exposing what wallet is linked to what steam account
+contract SteamToEtherSafe is Context{
+ using Address for address;
+
+ mapping(uint256 => uint256) internal _links;
+ 
+
+
+ constructor() {
+ console.log("Deployed SteamToEtherSafe Contract!");
+ }
+
+
+ //verify a eth wallet is a specific steam user
+ function Verify(uint256 hashed_steamid, address eth_wallet) public view returns(bool) {
+ uint256 _wallet = uint256(keccak256(abi.encodePacked(eth_wallet)));
+ return VerifyHashed(hashed_steamid, _wallet);
+ }
+ function VerifyHashed(uint256 hashed_steamid, uint256 hashed_eth_wallet) public view returns(bool) {
+ require(hashed_steamid > 0, "invalid steamid hash");
+ return _links[hashed_eth_wallet] == hashed_steamid;
+ }
+ function DoIHaveAnAccount() public view returns(bool)
+ {
+ return HasAccount(_msgSender());
+ }
+ function HasAccount(address eth_wallet) public view returns(bool)
+ {
+ uint256 _wallet = uint256(keccak256(abi.encodePacked(eth_wallet)));
+ return HasAccountHashed(_wallet);
+ }
+ function HasAccountHashed(uint256 hashed_eth_wallet) public view returns(bool)
+ {
+ return _links[hashed_eth_wallet] != 0;
+ }
+
+ // what do we do if someone loses their account? forever broken steamid64 link?
+ function LinkAccount(uint256 hashed_steamid) public {
+ uint256 _wallet = uint256(keccak256(abi.encodePacked(_msgSender())));
+ require(_links[_wallet] == 0, "Account already linked, must unlink from the source wallet"); //prevent hackers/others from taking over an accuont link
+ _links[_wallet] = hashed_steamid;
+ }
+ function UnlinkAccount() public {
+ uint256 _wallet = uint256(keccak256(abi.encodePacked(_msgSender())));
+ _links[_wallet] = 0;
+ }
+ 
+ 
+
+
+ //unsafe (exposes steamid64)
+ function LinkAccountUnsafe(uint64 steamid64) public {
+ uint256 hashed_steamid = uint256(keccak256(abi.encodePacked(steamid64)));
+ LinkAccount(hashed_steamid);
+ }
+ function VerifyUnsafe(uint64 steamid64, address eth_wallet) public view returns(bool) {
+ uint256 hashed_steamid = uint256(keccak256(abi.encodePacked(steamid64)));
+ return Verify(hashed_steamid, eth_wallet);
+ }
+}
\ No newline at end of file

notes/Skin-Z/3. resources/EVM/Hardhat.md

@@ -3,7 +3,7 @@ Hardhat is a newer development environment for the EVM. I think it's a significa
 
 ## Notable functions
 
-`npx hardhat compile` -> Compiles our smart contracts
-`npx hardhat test` -> Runs our test files
-`npx hardhat run .\script.js` -> Run a JS file w/ hardhat
+- `npx hardhat compile` -> Compiles our smart contracts
+- `npx hardhat test` -> Runs our test files
+- `npx hardhat run .\script.js` -> Run a JS file w/ hardhat