Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
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- Contract name:
- GemFab
- Optimization enabled
- true
- Compiler version
- v0.8.28+commit.7893614a
- Optimization runs
- 100
- EVM Version
- paris
- Verified at
- 2026-03-26T13:12:32.549134Z
contracts/rich/gem.sol
/// SPDX-License-Identifier: AGPL-3.0-only
// Copyright (C) 2021 kevin and his friends
// Copyright (C) 2017, 2018, 2019 dbrock, rain, mrchico
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, version 3.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
pragma solidity ^0.8.25;
contract Gem {
// === METADATA ===
string public name;
string public symbol;
uint8 public constant decimals = 18;
uint256 public totalSupply;
// === UI REGISTRY (ORIGINAL CALLER ONLY, SURVIVES RENOUNCE) ===
// The original caller (passed via factory) has permanent UI update rights
address public immutable deployer;
string public uiIpfsCid; // e.g. "Qm..."
uint256 public uiVersion; // incremental version number
event UIUpdated(string indexed ipfsCid, uint256 indexed version, address indexed updater);
error ErrNotDeployer();
// === OPTIONAL: backward compat bytes32 ===
bytes32 public immutable nameBytes32;
bytes32 public immutable symbolBytes32;
// === ERC20 STATE ===
mapping(address => uint256) public balanceOf;
mapping(address => mapping(address => uint256)) public allowance;
mapping(address => uint256) public nonces;
// === AUTH (wards) ===
mapping(address => bool) public wards;
event Ward(address indexed usr, bool authed);
// === EIP-2612 ===
bytes32 public immutable DOMAIN_SEPARATOR;
bytes32 public constant PERMIT_TYPEHASH =
keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
// === EVENTS ===
event Approval(address indexed src, address indexed guy, uint256 wad);
event Transfer(address indexed src, address indexed dst, uint256 wad);
// === ERRORS ===
error ErrWard();
error ErrUnderflow();
error ErrOverflow();
error ErrZeroDst();
error ErrPermit();
/// @notice Constructor takes explicit original deployer address
/// @param name_ Token name
/// @param symbol_ Token symbol
/// @param initialDeployer_ The original caller who will have permanent UI update rights
constructor(string memory name_, string memory symbol_, address initialDeployer_) payable {
name = name_;
symbol = symbol_;
// Backward compat
nameBytes32 = bytes32(bytes(name_));
symbolBytes32 = bytes32(bytes(symbol_));
// Immutable deployer = original caller (passed by factory)
deployer = initialDeployer_;
// Initial ward = factory caller (standard pattern)
wards[msg.sender] = true;
emit Ward(msg.sender, true);
// EIP-712 domain separator
DOMAIN_SEPARATOR = keccak256(
abi.encode(
keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
keccak256(bytes(name_)),
keccak256(bytes("1")),
block.chainid,
address(this)
)
);
}
// === AUTH MODIFIERS ===
modifier auth() {
if (!wards[msg.sender]) revert ErrWard();
_;
}
function rely(address usr) external auth {
wards[usr] = true;
emit Ward(usr, true);
}
function deny(address usr) external auth {
wards[usr] = false;
emit Ward(usr, false);
}
// === UI REGISTRY — ORIGINAL DEPLOYER ONLY (SURVIVES RENOUNCE) ===
/// @notice Update the official UI IPFS CID and version
/// @dev Only the original deployer (set at construction) can call this
/// @param ipfsCid The new IPFS CID (e.g. "QmXYZ...")
/// @param version Incremental version number
function setUI(string calldata ipfsCid, uint256 version) external {
if (msg.sender != deployer) revert ErrNotDeployer();
uiIpfsCid = ipfsCid;
uiVersion = version;
emit UIUpdated(ipfsCid, version, msg.sender);
}
// === MINT / BURN (WARD-ONLY) ===
function mint(address usr, uint256 wad) external auth {
unchecked {
uint256 supply = totalSupply;
totalSupply = supply + wad;
balanceOf[usr] += wad;
if (supply + wad < supply) revert ErrOverflow();
}
emit Transfer(address(0), usr, wad);
}
function burn(address usr, uint256 wad) external auth {
uint256 bal = balanceOf[usr];
balanceOf[usr] = bal - wad;
totalSupply -= wad;
if (bal < wad) revert ErrUnderflow();
emit Transfer(usr, address(0), wad);
}
// === ERC20 ===
function transfer(address dst, uint256 wad) external returns (bool) {
uint256 bal = balanceOf[msg.sender];
balanceOf[msg.sender] = bal - wad;
balanceOf[dst] += wad;
if (bal < wad) revert ErrUnderflow();
if (dst == address(0)) revert ErrZeroDst();
emit Transfer(msg.sender, dst, wad);
return true;
}
function transferFrom(address src, address dst, uint256 wad) external returns (bool) {
uint256 allowed = allowance[src][msg.sender];
if (allowed != type(uint256).max) {
allowance[src][msg.sender] = allowed - wad;
if (allowed < wad) revert ErrUnderflow();
}
uint256 bal = balanceOf[src];
balanceOf[src] = bal - wad;
balanceOf[dst] += wad;
if (bal < wad) revert ErrUnderflow();
if (dst == address(0)) revert ErrZeroDst();
emit Transfer(src, dst, wad);
return true;
}
function approve(address usr, uint256 wad) external returns (bool) {
allowance[msg.sender][usr] = wad;
emit Approval(msg.sender, usr, wad);
return true;
}
// === EIP-2612 permit ===
function permit(
address owner, address spender, uint256 value, uint256 deadline,
uint8 v, bytes32 r, bytes32 s
) external {
if (block.timestamp > deadline) revert ErrPermit();
bytes32 digest = keccak256(
abi.encodePacked(
"\x19\x01",
DOMAIN_SEPARATOR,
keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
)
);
address recovered = ecrecover(digest, v, r, s);
if (recovered == address(0) || recovered != owner) revert ErrPermit();
allowance[owner][spender] = value;
emit Approval(owner, spender, value);
}
}
// Updated Fab — passes original caller as immutable deployer
contract GemFab {
mapping(address => bool) public built;
event Build(address indexed caller, string name, string symbol, address indexed gem);
/// @notice Build a new Gem token
/// @dev Passes msg.sender (original caller) as the immutable deployer for UI updates
function build(string calldata name_, string calldata symbol_)
external payable returns (Gem gem)
{
gem = new Gem(name_, symbol_, msg.sender); // ← CRITICAL FIX: pass original caller as deployer
built[address(gem)] = true;
gem.rely(msg.sender); // Standard: give original caller ward control
emit Build(msg.sender, name_, symbol_, address(gem));
}
}
Compiler Settings
{"remappings":[],"optimizer":{"runs":100,"enabled":true},"metadata":{"bytecodeHash":"ipfs"},"libraries":{},"evmVersion":"paris","compilationTarget":{"contracts/rich/gem.sol":"GemFab"}}
Contract ABI
[{"type":"event","name":"Build","inputs":[{"type":"address","name":"caller","internalType":"address","indexed":true},{"type":"string","name":"name","internalType":"string","indexed":false},{"type":"string","name":"symbol","internalType":"string","indexed":false},{"type":"address","name":"gem","internalType":"address","indexed":true}],"anonymous":false},{"type":"function","stateMutability":"payable","outputs":[{"type":"address","name":"gem","internalType":"contract Gem"}],"name":"build","inputs":[{"type":"string","name":"name_","internalType":"string"},{"type":"string","name":"symbol_","internalType":"string"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"built","inputs":[{"type":"address","name":"","internalType":"address"}]}]
Contract Creation Code
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