feat(ctb): preserve legacy ETH invariant

Preserves the invariant in LegacyERC20ETH that balanceOf(x) is always
the same as address(x).balance. balanceOf is the only function that was
not being blocked and contracts may exist that rely on this behavior.

op-bindings/bindings/legacyerc20eth.go

@@ -30,8 +30,8 @@ var (
 
 // LegacyERC20ETHMetaData contains all meta data concerning the LegacyERC20ETH contract.
 var LegacyERC20ETHMetaData = &bind.MetaData{
-	ABI: 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y\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}]",
-	Bin: 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+	ABI: "[{\"inputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"Burn\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"Mint\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"inputs\":[],\"name\":\"BRIDGE\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"REMOTE_TOKEN\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_who\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"bridge\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"burn\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"decimals\",\"outputs\":[{\"internalType\":\"uint8\",\"name\":\"\",\"type\":\"uint8\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"decreaseAllowance\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"increaseAllowance\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"l1Token\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"l2Bridge\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"mint\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"remoteToken\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"bytes4\",\"name\":\"_interfaceId\",\"type\":\"bytes4\"}],\"name\":\"supportsInterface\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"pure\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"symbol\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\"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+	Bin: 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044820152606401610595565b6040517f08c379a000000000000000000000000000000000000000000000000000000000815260206004820152602d60248201527f4c656761637945524332304554483a206465637265617365416c6c6f77616e6360448201527f652069732064697361626c6564000000000000000000000000000000000000006064820152600090608401610595565b6040517f08c379a0000000000000000000000000000000000000000000000000000000008152602060048201526024808201527f4c656761637945524332304554483a207472616e73666572206973206469736160448201527f626c6564000000000000000000000000000000000000000000000000000000006064820152600090608401610595565b6000602082840312156108ae57600080fd5b81357fffffffff00000000000000000000000000000000000000000000000000000000811681146108de57600080fd5b9392505050565b600060208083528351808285015260005b81811015610912578581018301518582016040015282016108f6565b81811115610924576000604083870101525b50601f017fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe016929092016040019392505050565b803573ffffffffffffffffffffffffffffffffffffffff8116811461097c57600080fd5b919050565b6000806040838503121561099457600080fd5b61099d83610958565b946020939093013593505050565b6000806000606084860312156109c057600080fd5b6109c984610958565b92506109d760208501610958565b9150604084013590509250925092565b6000602082840312156109f957600080fd5b6108de82610958565b60008060408385031215610a1557600080fd5b610a1e83610958565b9150610a2c60208401610958565b90509250929050565b600181811c90821680610a4957607f821691505b602082108103610a82577f4e487b7100000000000000000000000000000000000000000000000000000000600052602260045260246000fd5b5091905056fea164736f6c634300080f000a",
 }
 
 // LegacyERC20ETHABI is the input ABI used to generate the binding from.
@@ -296,10 +296,10 @@ func (_LegacyERC20ETH *LegacyERC20ETHCallerSession) Allowance(owner common.Addre
 
 // BalanceOf is a free data retrieval call binding the contract method 0x70a08231.
 //
-// Solidity: function balanceOf(address account) view returns(uint256)
-func (_LegacyERC20ETH *LegacyERC20ETHCaller) BalanceOf(opts *bind.CallOpts, account common.Address) (*big.Int, error) {
+// Solidity: function balanceOf(address _who) view returns(uint256)
+func (_LegacyERC20ETH *LegacyERC20ETHCaller) BalanceOf(opts *bind.CallOpts, _who common.Address) (*big.Int, error) {
 	var out []interface{}
-	err := _LegacyERC20ETH.contract.Call(opts, &out, "balanceOf", account)
+	err := _LegacyERC20ETH.contract.Call(opts, &out, "balanceOf", _who)
 
 	if err != nil {
 		return *new(*big.Int), err
@@ -313,16 +313,16 @@ func (_LegacyERC20ETH *LegacyERC20ETHCaller) BalanceOf(opts *bind.CallOpts, acco
 
 // BalanceOf is a free data retrieval call binding the contract method 0x70a08231.
 //
-// Solidity: function balanceOf(address account) view returns(uint256)
-func (_LegacyERC20ETH *LegacyERC20ETHSession) BalanceOf(account common.Address) (*big.Int, error) {
-	return _LegacyERC20ETH.Contract.BalanceOf(&_LegacyERC20ETH.CallOpts, account)
+// Solidity: function balanceOf(address _who) view returns(uint256)
+func (_LegacyERC20ETH *LegacyERC20ETHSession) BalanceOf(_who common.Address) (*big.Int, error) {
+	return _LegacyERC20ETH.Contract.BalanceOf(&_LegacyERC20ETH.CallOpts, _who)
 }
 
 // BalanceOf is a free data retrieval call binding the contract method 0x70a08231.
 //
-// Solidity: function balanceOf(address account) view returns(uint256)
-func (_LegacyERC20ETH *LegacyERC20ETHCallerSession) BalanceOf(account common.Address) (*big.Int, error) {
-	return _LegacyERC20ETH.Contract.BalanceOf(&_LegacyERC20ETH.CallOpts, account)
+// Solidity: function balanceOf(address _who) view returns(uint256)
+func (_LegacyERC20ETH *LegacyERC20ETHCallerSession) BalanceOf(_who common.Address) (*big.Int, error) {
+	return _LegacyERC20ETH.Contract.BalanceOf(&_LegacyERC20ETH.CallOpts, _who)
 }
 
 // Bridge is a free data retrieval call binding the contract method 0xe78cea92.

op-bindings/bindings/legacyerc20eth_more.go

@@ -13,7 +13,7 @@ const LegacyERC20ETHStorageLayoutJSON = "{\"storage\":[{\"astId\":1000,\"contrac
 
 var LegacyERC20ETHStorageLayout = new(solc.StorageLayout)
 
-var LegacyERC20ETHDeployedBin = "0x608060405234801561001057600080fd5b506004361061016c5760003560e01c806395d89b41116100cd578063c01e1bd611610081578063dd62ed3e11610066578063dd62ed3e1461032c578063e78cea92146102e0578063ee9a31a21461037257600080fd5b8063c01e1bd614610306578063d6c0b2c41461030657600080fd5b8063a457c2d7116100b2578063a457c2d7146102ba578063a9059cbb146102cd578063ae1f6aaf146102e057600080fd5b806395d89b411461029f5780639dc29fac146102a757600080fd5b806323b872dd116101245780633950935111610109578063395093511461024157806340c10f191461025457806370a082311461026957600080fd5b806323b872dd1461021f578063313ce5671461023257600080fd5b806306fdde031161015557806306fdde03146101e5578063095ea7b3146101fa57806318160ddd1461020d57600080fd5b806301ffc9a714610171578063033964be14610199575b600080fd5b61018461017f3660046108aa565b610399565b60405190151581526020015b60405180910390f35b6101c07f000000000000000000000000000000000000000000000000000000000000000081565b60405173ffffffffffffffffffffffffffffffffffffffff9091168152602001610190565b6101ed61048a565b60405161019091906108f3565b61018461020836600461098f565b61051c565b6002545b604051908152602001610190565b61018461022d3660046109b9565b6105ac565b60405160128152602001610190565b61018461024f36600461098f565b610637565b61026761026236600461098f565b6106c2565b005b6102116102773660046109f5565b73ffffffffffffffffffffffffffffffffffffffff1660009081526020819052604090205490565b6101ed610724565b6102676102b536600461098f565b610733565b6101846102c836600461098f565b610795565b6101846102db36600461098f565b610820565b7f00000000000000000000000000000000000000000000000000000000000000006101c0565b7f00000000000000000000000000000000000000000000000000000000000000006101c0565b61021161033a366004610a10565b73ffffffffffffffffffffffffffffffffffffffff918216600090815260016020908152604080832093909416825291909152205490565b6101c07f000000000000000000000000000000000000000000000000000000000000000081565b60007f01ffc9a7000000000000000000000000000000000000000000000000000000007f1d1d8b63000000000000000000000000000000000000000000000000000000007fec4fc8e3000000000000000000000000000000000000000000000000000000007fffffffff00000000000000000000000000000000000000000000000000000000851683148061045257507fffffffff00000000000000000000000000000000000000000000000000000000858116908316145b8061048157507fffffffff00000000000000000000000000000000000000000000000000000000858116908216145b95945050505050565b60606003805461049990610a43565b80601f01602080910402602001604051908101604052809291908181526020018280546104c590610a43565b80156105125780601f106104e757610100808354040283529160200191610512565b820191906000526020600020905b8154815290600101906020018083116104f557829003601f168201915b5050505050905090565b6040517f08c379a000000000000000000000000000000000000000000000000000000000815260206004820152602360248201527f4c656761637945524332304554483a20617070726f766520697320646973616260448201527f6c6564000000000000000000000000000000000000000000000000000000000060648201526000906084015b60405180910390fd5b6040517f08c379a000000000000000000000000000000000000000000000000000000000815260206004820152602860248201527f4c656761637945524332304554483a207472616e7366657246726f6d2069732060448201527f64697361626c656400000000000000000000000000000000000000000000000060648201526000906084016105a3565b6040517f08c379a000000000000000000000000000000000000000000000000000000000815260206004820152602d60248201527f4c656761637945524332304554483a20696e637265617365416c6c6f77616e6360448201527f652069732064697361626c65640000000000000000000000000000000000000060648201526000906084016105a3565b6040517f08c379a000000000000000000000000000000000000000000000000000000000815260206004820181905260248201527f4c656761637945524332304554483a206d696e742069732064697361626c656460448201526064016105a3565b60606004805461049990610a43565b6040517f08c379a000000000000000000000000000000000000000000000000000000000815260206004820181905260248201527f4c656761637945524332304554483a206275726e2069732064697361626c656460448201526064016105a3565b6040517f08c379a000000000000000000000000000000000000000000000000000000000815260206004820152602d60248201527f4c656761637945524332304554483a206465637265617365416c6c6f77616e6360448201527f652069732064697361626c65640000000000000000000000000000000000000060648201526000906084016105a3565b6040517f08c379a0000000000000000000000000000000000000000000000000000000008152602060048201526024808201527f4c656761637945524332304554483a207472616e73666572206973206469736160448201527f626c65640000000000000000000000000000000000000000000000000000000060648201526000906084016105a3565b6000602082840312156108bc57600080fd5b81357fffffffff00000000000000000000000000000000000000000000000000000000811681146108ec57600080fd5b9392505050565b600060208083528351808285015260005b8181101561092057858101830151858201604001528201610904565b81811115610932576000604083870101525b50601f017fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe016929092016040019392505050565b803573ffffffffffffffffffffffffffffffffffffffff8116811461098a57600080fd5b919050565b600080604083850312156109a257600080fd5b6109ab83610966565b946020939093013593505050565b6000806000606084860312156109ce57600080fd5b6109d784610966565b92506109e560208501610966565b9150604084013590509250925092565b600060208284031215610a0757600080fd5b6108ec82610966565b60008060408385031215610a2357600080fd5b610a2c83610966565b9150610a3a60208401610966565b90509250929050565b600181811c90821680610a5757607f821691505b602082108103610a90577f4e487b7100000000000000000000000000000000000000000000000000000000600052602260045260246000fd5b5091905056fea164736f6c634300080f000a"
+var LegacyERC20ETHDeployedBin = "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"
 
 func init() {
 	if err := json.Unmarshal([]byte(LegacyERC20ETHStorageLayoutJSON), LegacyERC20ETHStorageLayout); err != nil {

packages/contracts-bedrock/contracts/legacy/LegacyERC20ETH.sol

@@ -22,6 +22,19 @@ contract LegacyERC20ETH is OptimismMintableERC20 {
         OptimismMintableERC20(Predeploys.L2_STANDARD_BRIDGE, address(0), "Ether", "ETH")
     {}
 
+    /**
+     * @notice Returns the ETH balance of the target account. Overrides the base behavior of the
+     *         contract to preserve the invariant that the balance within this contract always
+     *         matches the balance in the state trie.
+     *
+     * @param _who Address of the account to query.
+     *
+     * @return The ETH balance of the target account.
+     */
+    function balanceOf(address _who) public view virtual override returns (uint256) {
+        return address(_who).balance;
+    }
+
     /**
      * @custom:blocked
      * @notice Mints some amount of ETH.