I think Base side is implemented correctly.

contracts/TenGransBaseToken.sol

@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.19;
+
+import "./TenGransAbstractToken.sol";
+import "@eth-optimism/contracts-bedrock/contracts/universal/IOptimismMintableERC20.sol";
+
+contract TenGransBaseToken is AbstractGrans, IOptimismMintableERC20 {
+    /// @notice Address of the corresponding version of this token on the remote chain.
+    address public immutable REMOTE_TOKEN;
+
+    /// @notice Address of the StandardBridge on this network.
+    address public immutable BRIDGE = 0x4200000000000000000000000000000000000010;
+
+    /// @notice Emitted whenever tokens are minted for an account.
+    /// @param account Address of the account tokens are being minted for.
+    /// @param amount  Amount of tokens minted.
+    event Mint(address indexed account, uint256 amount);
+
+    /// @notice Emitted whenever tokens are burned from an account.
+    /// @param account Address of the account tokens are being burned from.
+    /// @param amount  Amount of tokens burned.
+    event Burn(address indexed account, uint256 amount);
+
+    /// @notice A modifier that only allows the bridge to call
+    modifier onlyBridge() {
+        require(_msgSender() == BRIDGE, "OptimismMintableERC20: only bridge can mint and burn");
+        _;
+    }
+
+    constructor(address _remoteToken) AbstractGrans() {
+        REMOTE_TOKEN = _remoteToken;
+    }
+
+    function balanceOf(address account) public view virtual override(AbstractGrans) returns (uint256) {
+        return AbstractGrans.balanceOf(account);
+    }
+
+    function transferFrom(address sender, address recipient, uint256 amount) public virtual override(AbstractGrans) returns (bool) {
+        return AbstractGrans.transferFrom(sender, recipient, amount);
+    }
+
+    /// @notice Allows the StandardBridge on this network to mint tokens.
+    /// @param _to     Address to mint tokens to.
+    /// @param _amount Amount of tokens to mint.
+    function mint(
+        address _to,
+        uint256 _amount
+    )
+        external
+        virtual
+        override(IOptimismMintableERC20)
+        onlyBridge
+    {
+        _mint(_to, _amount);
+        emit Mint(_to, _amount);
+    }
+
+    /// @notice Allows the StandardBridge on this network to burn tokens.
+    /// @param _from   Address to burn tokens from.
+    /// @param _amount Amount of tokens to burn.
+    function burn(
+        address _from,
+        uint256 _amount
+    )
+        external
+        virtual
+        override(IOptimismMintableERC20)
+        onlyBridge
+    {
+        _burn(_from, _amount);
+        emit Burn(_from, _amount);
+    }
+
+    /// @notice ERC165 interface check function.
+    /// @param _interfaceId Interface ID to check.
+    /// @return Whether or not the interface is supported by this contract.
+    function supportsInterface(bytes4 _interfaceId) public pure virtual override(AbstractGrans, IERC165) returns (bool) {
+        bytes4 iface1 = type(IERC165).interfaceId;
+        // Interface corresponding to the updated OptimismMintableERC20 (this contract).
+        bytes4 iface2 = type(IOptimismMintableERC20).interfaceId;
+        return _interfaceId == iface1 || _interfaceId == iface2;
+    }
+
+    /// @custom:legacy
+    /// @notice Legacy getter for REMOTE_TOKEN.
+    // Is this needed?
+    function remoteToken() public view virtual override(IOptimismMintableERC20) returns (address) {
+        return REMOTE_TOKEN;
+    }
+
+    /// @custom:legacy
+    /// @notice Legacy getter for BRIDGE.
+    // Is this needed?
+    function bridge() public view virtual override(IOptimismMintableERC20) returns (address) {
+        return BRIDGE;
+    }
+}

package-lock.json

@@ -9,6 +9,7 @@
       "version": "1.0.0",
       "license": "MIT",
       "dependencies": {
+        "@eth-optimism/contracts-bedrock": "^0.16.0",
         "@openzeppelin/contracts": "^4.9.3",
         "erc-payable-token": "^4.9.3"
       },
@@ -76,6 +77,22 @@
         "node": ">=12"
       }
     },
+    "node_modules/@eth-optimism/contracts-bedrock": {
+      "version": "0.16.0",
+      "resolved": "https://registry.npmjs.org/@eth-optimism/contracts-bedrock/-/contracts-bedrock-0.16.0.tgz",
+      "integrity": "sha512-MfHJdeQ/BzHgkoHnA+NGb1hU8CH0OFsp4ylmFi0uwYh3xPJxcHt9qhy1g4MGGMUGAPIUmlBPaqhwbBlQkaeFrA==",
+      "dependencies": {
+        "@openzeppelin/contracts": "4.7.3",
+        "@openzeppelin/contracts-upgradeable": "4.7.3",
+        "@rari-capital/solmate": "github:transmissions11/solmate#8f9b23f8838670afda0fd8983f2c41e8037ae6bc",
+        "clones-with-immutable-args": "github:Saw-mon-and-Natalie/clones-with-immutable-args#105efee1b9127ed7f6fedf139e1fc796ce8791f2"
+      }
+    },
+    "node_modules/@eth-optimism/contracts-bedrock/node_modules/@openzeppelin/contracts": {
+      "version": "4.7.3",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.7.3.tgz",
+      "integrity": "sha512-dGRS0agJzu8ybo44pCIf3xBaPQN/65AIXNgK8+4gzKd5kbvlqyxryUYVLJv7fK98Seyd2hDZzVEHSWAh0Bt1Yw=="
+    },
     "node_modules/@ethersproject/abi": {
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/abi/-/abi-5.7.0.tgz",
@@ -1737,6 +1754,17 @@
       "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.9.3.tgz",
       "integrity": "sha512-He3LieZ1pP2TNt5JbkPA4PNT9WC3gOTOlDcFGJW4Le4QKqwmiNJCRt44APfxMxvq7OugU/cqYuPcSBzOw38DAg=="
     },
+    "node_modules/@openzeppelin/contracts-upgradeable": {
+      "version": "4.7.3",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts-upgradeable/-/contracts-upgradeable-4.7.3.tgz",
+      "integrity": "sha512-+wuegAMaLcZnLCJIvrVUDzA9z/Wp93f0Dla/4jJvIhijRrPabjQbZe6fWiECLaJyfn5ci9fqf9vTw3xpQOad2A=="
+    },
+    "node_modules/@rari-capital/solmate": {
+      "version": "7.0.0-alpha.3",
+      "resolved": "git+ssh://git@github.com/transmissions11/solmate.git#8f9b23f8838670afda0fd8983f2c41e8037ae6bc",
+      "integrity": "sha512-cW0PouqpoiEDhhkOxkqQKcjG4oMJ1Qb+kY6aiwBlgOjpfnhmXK7lkU5ZkHKC22ypQj6lvSc6CaHmXXaPywPsYg==",
+      "license": "MIT"
+    },
     "node_modules/@scure/base": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/@scure/base/-/base-1.1.1.tgz",
@@ -3007,6 +3035,12 @@
         "wrap-ansi": "^7.0.0"
       }
     },
+    "node_modules/clones-with-immutable-args": {
+      "version": "2.0.0",
+      "resolved": "git+ssh://git@github.com/Saw-mon-and-Natalie/clones-with-immutable-args.git#105efee1b9127ed7f6fedf139e1fc796ce8791f2",
+      "integrity": "sha512-k3pqgVlL6sTgySZG8eN+spNdokeM/J7kgBVn0xJeZIg+cv1vA1ert1jFDuHX1Vfz1uTTqfZbmWHhvCCdy0VpNA==",
+      "license": "BSD"
+    },
     "node_modules/color-convert": {
       "version": "1.9.3",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",

package.json

@@ -27,6 +27,7 @@
     "prettier-plugin-solidity": "^1.1.3"
   },
   "dependencies": {
+    "@eth-optimism/contracts-bedrock": "^0.16.0",
     "@openzeppelin/contracts": "^4.9.3",
     "erc-payable-token": "^4.9.3"
   }