refactor: move brother_node development artifact to dev/test-nodes subdirectory

Development Artifact Cleanup:
✅ BROTHER_NODE REORGANIZATION: Moved development test node to appropriate location
- dev/test-nodes/brother_node/: Moved from root directory for better organization
- Contains development configuration, test logs, and test chain data
- No impact on production systems - purely development/testing artifact

✅ DEVELOPMENT ARTIFACTS IDENTIFIED:
- Chain ID: aitbc-brother-chain (test/development chain)
- Ports: 8010 (P2P) and 8011 (RPC) - different from production
- Environment: .env file with test configuration
- Logs: rpc.log and node.log from development testing session (March 15, 2026)

✅ ROOT DIRECTORY CLEANUP: Removed development clutter from production directory
- brother_node/ moved to dev/test-nodes/brother_node/
- Root directory now contains only production-ready components
- Development artifacts properly organized in dev/ subdirectory

DIRECTORY STRUCTURE IMPROVEMENT:
📁 dev/test-nodes/: Development and testing node configurations
🏗️ Root Directory: Clean production structure with only essential components
🧪 Development Isolation: Test environments separated from production

BENEFITS:
✅ Clean Production Directory: No development artifacts in root
✅ Better Organization: Development nodes grouped in dev/ subdirectory
✅ Clear Separation: Production vs development environments clearly distinguished
✅ Maintainability: Easier to identify and manage development components

RESULT: Successfully moved brother_node development artifact to dev/test-nodes/ subdirectory, cleaning up the root directory while preserving development testing environment for future use.

dev/env/node_modules/@openzeppelin/contracts/account/Account.sol

@@ -0,0 +1,145 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (account/Account.sol)
+
+pragma solidity ^0.8.20;
+
+import {PackedUserOperation, IAccount, IEntryPoint} from "../interfaces/draft-IERC4337.sol";
+import {ERC4337Utils} from "./utils/draft-ERC4337Utils.sol";
+import {AbstractSigner} from "../utils/cryptography/signers/AbstractSigner.sol";
+
+/**
+ * @dev A simple ERC4337 account implementation. This base implementation only includes the minimal logic to process
+ * user operations.
+ *
+ * Developers must implement the {AbstractSigner-_rawSignatureValidation} function to define the account's validation logic.
+ *
+ * NOTE: This core account doesn't include any mechanism for performing arbitrary external calls. This is an essential
+ * feature that all Account should have. We leave it up to the developers to implement the mechanism of their choice.
+ * Common choices include ERC-6900, ERC-7579 and ERC-7821 (among others).
+ *
+ * IMPORTANT: Implementing a mechanism to validate signatures is a security-sensitive operation as it may allow an
+ * attacker to bypass the account's security measures. Check out {SignerECDSA}, {SignerP256}, or {SignerRSA} for
+ * digital signature validation implementations.
+ *
+ * @custom:stateless
+ */
+abstract contract Account is AbstractSigner, IAccount {
+    /**
+     * @dev Unauthorized call to the account.
+     */
+    error AccountUnauthorized(address sender);
+
+    /**
+     * @dev Revert if the caller is not the entry point or the account itself.
+     */
+    modifier onlyEntryPointOrSelf() {
+        _checkEntryPointOrSelf();
+        _;
+    }
+
+    /**
+     * @dev Revert if the caller is not the entry point.
+     */
+    modifier onlyEntryPoint() {
+        _checkEntryPoint();
+        _;
+    }
+
+    /**
+     * @dev Canonical entry point for the account that forwards and validates user operations.
+     */
+    function entryPoint() public view virtual returns (IEntryPoint) {
+        return ERC4337Utils.ENTRYPOINT_V08;
+    }
+
+    /**
+     * @dev Return the account nonce for the canonical sequence.
+     */
+    function getNonce() public view virtual returns (uint256) {
+        return getNonce(0);
+    }
+
+    /**
+     * @dev Return the account nonce for a given sequence (key).
+     */
+    function getNonce(uint192 key) public view virtual returns (uint256) {
+        return entryPoint().getNonce(address(this), key);
+    }
+
+    /**
+     * @inheritdoc IAccount
+     */
+    function validateUserOp(
+        PackedUserOperation calldata userOp,
+        bytes32 userOpHash,
+        uint256 missingAccountFunds
+    ) public virtual onlyEntryPoint returns (uint256) {
+        uint256 validationData = _validateUserOp(userOp, userOpHash);
+        _payPrefund(missingAccountFunds);
+        return validationData;
+    }
+
+    /**
+     * @dev Returns the validationData for a given user operation. By default, this checks the signature of the
+     * signable hash (produced by {_signableUserOpHash}) using the abstract signer ({AbstractSigner-_rawSignatureValidation}).
+     *
+     * NOTE: The userOpHash is assumed to be correct. Calling this function with a userOpHash that does not match the
+     * userOp will result in undefined behavior.
+     */
+    function _validateUserOp(
+        PackedUserOperation calldata userOp,
+        bytes32 userOpHash
+    ) internal virtual returns (uint256) {
+        return
+            _rawSignatureValidation(_signableUserOpHash(userOp, userOpHash), userOp.signature)
+                ? ERC4337Utils.SIG_VALIDATION_SUCCESS
+                : ERC4337Utils.SIG_VALIDATION_FAILED;
+    }
+
+    /**
+     * @dev Virtual function that returns the signable hash for a user operations. Since v0.8.0 of the entrypoint,
+     * `userOpHash` is an EIP-712 hash that can be signed directly.
+     */
+    function _signableUserOpHash(
+        PackedUserOperation calldata /*userOp*/,
+        bytes32 userOpHash
+    ) internal view virtual returns (bytes32) {
+        return userOpHash;
+    }
+
+    /**
+     * @dev Sends the missing funds for executing the user operation to the {entrypoint}.
+     * The `missingAccountFunds` must be defined by the entrypoint when calling {validateUserOp}.
+     */
+    function _payPrefund(uint256 missingAccountFunds) internal virtual {
+        if (missingAccountFunds > 0) {
+            (bool success, ) = payable(msg.sender).call{value: missingAccountFunds}("");
+            success; // Silence warning. The entrypoint should validate the result.
+        }
+    }
+
+    /**
+     * @dev Ensures the caller is the {entrypoint}.
+     */
+    function _checkEntryPoint() internal view virtual {
+        address sender = msg.sender;
+        if (sender != address(entryPoint())) {
+            revert AccountUnauthorized(sender);
+        }
+    }
+
+    /**
+     * @dev Ensures the caller is the {entrypoint} or the account itself.
+     */
+    function _checkEntryPointOrSelf() internal view virtual {
+        address sender = msg.sender;
+        if (sender != address(this) && sender != address(entryPoint())) {
+            revert AccountUnauthorized(sender);
+        }
+    }
+
+    /**
+     * @dev Receive Ether.
+     */
+    receive() external payable virtual {}
+}

dev/env/node_modules/@openzeppelin/contracts/account/extensions/draft-AccountERC7579.sol

@@ -0,0 +1,405 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (account/extensions/draft-AccountERC7579.sol)
+
+pragma solidity ^0.8.26;
+
+import {PackedUserOperation} from "../../interfaces/draft-IERC4337.sol";
+import {IERC1271} from "../../interfaces/IERC1271.sol";
+import {IERC7579Module, IERC7579Validator, IERC7579Execution, IERC7579AccountConfig, IERC7579ModuleConfig, MODULE_TYPE_VALIDATOR, MODULE_TYPE_EXECUTOR, MODULE_TYPE_FALLBACK} from "../../interfaces/draft-IERC7579.sol";
+import {ERC7579Utils, Mode, CallType, ExecType} from "../../account/utils/draft-ERC7579Utils.sol";
+import {EnumerableSet} from "../../utils/structs/EnumerableSet.sol";
+import {Bytes} from "../../utils/Bytes.sol";
+import {Packing} from "../../utils/Packing.sol";
+import {Address} from "../../utils/Address.sol";
+import {Calldata} from "../../utils/Calldata.sol";
+import {Account} from "../Account.sol";
+
+/**
+ * @dev Extension of {Account} that implements support for ERC-7579 modules.
+ *
+ * To comply with the ERC-1271 support requirement, this contract defers signature validation to
+ * installed validator modules by calling {IERC7579Validator-isValidSignatureWithSender}.
+ *
+ * This contract does not implement validation logic for user operations since this functionality
+ * is often delegated to self-contained validation modules. Developers must install a validator module
+ * upon initialization (or any other mechanism to enable execution from the account):
+ *
+ * ```solidity
+ * contract MyAccountERC7579 is AccountERC7579, Initializable {
+ *   function initializeAccount(address validator, bytes calldata validatorData) public initializer {
+ *     _installModule(MODULE_TYPE_VALIDATOR, validator, validatorData);
+ *   }
+ * }
+ * ```
+ *
+ * [NOTE]
+ * ====
+ * * Hook support is not included. See {AccountERC7579Hooked} for a version that hooks to execution.
+ * * Validator selection, when verifying either ERC-1271 signature or ERC-4337 UserOperation is implemented in
+ *   internal virtual functions {_extractUserOpValidator} and {_extractSignatureValidator}. Both are implemented
+ *   following common practices. However, this part is not standardized in ERC-7579 (or in any follow-up ERC). Some
+ *   accounts may want to override these internal functions.
+ * * When combined with {ERC7739}, resolution ordering of {isValidSignature} may have an impact ({ERC7739} does not
+ *   call super). Manual resolution might be necessary.
+ * * Static calls (using callType `0xfe`) are currently NOT supported.
+ * ====
+ *
+ * WARNING: Removing all validator modules will render the account inoperable, as no user operations can be validated thereafter.
+ */
+abstract contract AccountERC7579 is Account, IERC1271, IERC7579Execution, IERC7579AccountConfig, IERC7579ModuleConfig {
+    using Bytes for *;
+    using ERC7579Utils for *;
+    using EnumerableSet for *;
+    using Packing for bytes32;
+
+    EnumerableSet.AddressSet private _validators;
+    EnumerableSet.AddressSet private _executors;
+    mapping(bytes4 selector => address) private _fallbacks;
+
+    /// @dev The account's {fallback} was called with a selector that doesn't have an installed handler.
+    error ERC7579MissingFallbackHandler(bytes4 selector);
+
+    /// @dev Modifier that checks if the caller is an installed module of the given type.
+    modifier onlyModule(uint256 moduleTypeId, bytes calldata additionalContext) {
+        _checkModule(moduleTypeId, msg.sender, additionalContext);
+        _;
+    }
+
+    /// @dev See {_fallback}.
+    fallback(bytes calldata) external payable virtual returns (bytes memory) {
+        return _fallback();
+    }
+
+    /// @inheritdoc IERC7579AccountConfig
+    function accountId() public view virtual returns (string memory) {
+        // vendorname.accountname.semver
+        return "@openzeppelin/community-contracts.AccountERC7579.v0.0.0";
+    }
+
+    /**
+     * @inheritdoc IERC7579AccountConfig
+     *
+     * @dev Supported call types:
+     * * Single (`0x00`): A single transaction execution.
+     * * Batch (`0x01`): A batch of transactions execution.
+     * * Delegate (`0xff`): A delegate call execution.
+     *
+     * Supported exec types:
+     * * Default (`0x00`): Default execution type (revert on failure).
+     * * Try (`0x01`): Try execution type (emits ERC7579TryExecuteFail on failure).
+     */
+    function supportsExecutionMode(bytes32 encodedMode) public view virtual returns (bool) {
+        (CallType callType, ExecType execType, , ) = Mode.wrap(encodedMode).decodeMode();
+        return
+            (callType == ERC7579Utils.CALLTYPE_SINGLE ||
+                callType == ERC7579Utils.CALLTYPE_BATCH ||
+                callType == ERC7579Utils.CALLTYPE_DELEGATECALL) &&
+            (execType == ERC7579Utils.EXECTYPE_DEFAULT || execType == ERC7579Utils.EXECTYPE_TRY);
+    }
+
+    /**
+     * @inheritdoc IERC7579AccountConfig
+     *
+     * @dev Supported module types:
+     *
+     * * Validator: A module used during the validation phase to determine if a transaction is valid and
+     * should be executed on the account.
+     * * Executor: A module that can execute transactions on behalf of the smart account via a callback.
+     * * Fallback Handler: A module that can extend the fallback functionality of a smart account.
+     */
+    function supportsModule(uint256 moduleTypeId) public view virtual returns (bool) {
+        return
+            moduleTypeId == MODULE_TYPE_VALIDATOR ||
+            moduleTypeId == MODULE_TYPE_EXECUTOR ||
+            moduleTypeId == MODULE_TYPE_FALLBACK;
+    }
+
+    /// @inheritdoc IERC7579ModuleConfig
+    function installModule(
+        uint256 moduleTypeId,
+        address module,
+        bytes calldata initData
+    ) public virtual onlyEntryPointOrSelf {
+        _installModule(moduleTypeId, module, initData);
+    }
+
+    /// @inheritdoc IERC7579ModuleConfig
+    function uninstallModule(
+        uint256 moduleTypeId,
+        address module,
+        bytes calldata deInitData
+    ) public virtual onlyEntryPointOrSelf {
+        _uninstallModule(moduleTypeId, module, deInitData);
+    }
+
+    /// @inheritdoc IERC7579ModuleConfig
+    function isModuleInstalled(
+        uint256 moduleTypeId,
+        address module,
+        bytes calldata additionalContext
+    ) public view virtual returns (bool) {
+        if (moduleTypeId == MODULE_TYPE_VALIDATOR) return _validators.contains(module);
+        if (moduleTypeId == MODULE_TYPE_EXECUTOR) return _executors.contains(module);
+        if (moduleTypeId == MODULE_TYPE_FALLBACK) return _fallbacks[bytes4(additionalContext[0:4])] == module;
+        return false;
+    }
+
+    /// @inheritdoc IERC7579Execution
+    function execute(bytes32 mode, bytes calldata executionCalldata) public payable virtual onlyEntryPointOrSelf {
+        _execute(Mode.wrap(mode), executionCalldata);
+    }
+
+    /// @inheritdoc IERC7579Execution
+    function executeFromExecutor(
+        bytes32 mode,
+        bytes calldata executionCalldata
+    )
+        public
+        payable
+        virtual
+        onlyModule(MODULE_TYPE_EXECUTOR, Calldata.emptyBytes())
+        returns (bytes[] memory returnData)
+    {
+        return _execute(Mode.wrap(mode), executionCalldata);
+    }
+
+    /**
+     * @dev Implement ERC-1271 through IERC7579Validator modules. If module based validation fails, fallback to
+     * "native" validation by the abstract signer.
+     *
+     * NOTE: when combined with {ERC7739}, resolution ordering may have an impact ({ERC7739} does not call super).
+     * Manual resolution might be necessary.
+     */
+    function isValidSignature(bytes32 hash, bytes calldata signature) public view virtual returns (bytes4) {
+        // check signature length is enough for extraction
+        if (signature.length >= 20) {
+            (address module, bytes calldata innerSignature) = _extractSignatureValidator(signature);
+            // if module is not installed, skip
+            if (isModuleInstalled(MODULE_TYPE_VALIDATOR, module, Calldata.emptyBytes())) {
+                // try validation, skip any revert
+                try IERC7579Validator(module).isValidSignatureWithSender(msg.sender, hash, innerSignature) returns (
+                    bytes4 magic
+                ) {
+                    return magic;
+                } catch {}
+            }
+        }
+        return bytes4(0xffffffff);
+    }
+
+    /**
+     * @dev Validates a user operation with {_signableUserOpHash} and returns the validation data
+     * if the module specified by the first 20 bytes of the nonce key is installed. Falls back to
+     * {Account-_validateUserOp} otherwise.
+     *
+     * See {_extractUserOpValidator} for the module extraction logic.
+     */
+    function _validateUserOp(
+        PackedUserOperation calldata userOp,
+        bytes32 userOpHash
+    ) internal virtual override returns (uint256) {
+        address module = _extractUserOpValidator(userOp);
+        return
+            isModuleInstalled(MODULE_TYPE_VALIDATOR, module, Calldata.emptyBytes())
+                ? IERC7579Validator(module).validateUserOp(userOp, _signableUserOpHash(userOp, userOpHash))
+                : super._validateUserOp(userOp, userOpHash);
+    }
+
+    /**
+     * @dev ERC-7579 execution logic. See {supportsExecutionMode} for supported modes.
+     *
+     * Reverts if the call type is not supported.
+     */
+    function _execute(
+        Mode mode,
+        bytes calldata executionCalldata
+    ) internal virtual returns (bytes[] memory returnData) {
+        (CallType callType, ExecType execType, , ) = mode.decodeMode();
+        if (callType == ERC7579Utils.CALLTYPE_SINGLE) return executionCalldata.execSingle(execType);
+        if (callType == ERC7579Utils.CALLTYPE_BATCH) return executionCalldata.execBatch(execType);
+        if (callType == ERC7579Utils.CALLTYPE_DELEGATECALL) return executionCalldata.execDelegateCall(execType);
+        revert ERC7579Utils.ERC7579UnsupportedCallType(callType);
+    }
+
+    /**
+     * @dev Installs a module of the given type with the given initialization data.
+     *
+     * For the fallback module type, the `initData` is expected to be the (packed) concatenation of a 4-byte
+     * selector and the rest of the data to be sent to the handler when calling {IERC7579Module-onInstall}.
+     *
+     * Requirements:
+     *
+     * * Module type must be supported. See {supportsModule}. Reverts with {ERC7579Utils-ERC7579UnsupportedModuleType}.
+     * * Module must be of the given type. Reverts with {ERC7579Utils-ERC7579MismatchedModuleTypeId}.
+     * * Module must not be already installed. Reverts with {ERC7579Utils-ERC7579AlreadyInstalledModule}.
+     *
+     * Emits a {IERC7579ModuleConfig-ModuleInstalled} event.
+     */
+    function _installModule(uint256 moduleTypeId, address module, bytes memory initData) internal virtual {
+        require(supportsModule(moduleTypeId), ERC7579Utils.ERC7579UnsupportedModuleType(moduleTypeId));
+        require(
+            IERC7579Module(module).isModuleType(moduleTypeId),
+            ERC7579Utils.ERC7579MismatchedModuleTypeId(moduleTypeId, module)
+        );
+
+        if (moduleTypeId == MODULE_TYPE_VALIDATOR) {
+            require(_validators.add(module), ERC7579Utils.ERC7579AlreadyInstalledModule(moduleTypeId, module));
+        } else if (moduleTypeId == MODULE_TYPE_EXECUTOR) {
+            require(_executors.add(module), ERC7579Utils.ERC7579AlreadyInstalledModule(moduleTypeId, module));
+        } else if (moduleTypeId == MODULE_TYPE_FALLBACK) {
+            bytes4 selector;
+            (selector, initData) = _decodeFallbackData(initData);
+            require(
+                _fallbacks[selector] == address(0),
+                ERC7579Utils.ERC7579AlreadyInstalledModule(moduleTypeId, module)
+            );
+            _fallbacks[selector] = module;
+        }
+
+        IERC7579Module(module).onInstall(initData);
+        emit ModuleInstalled(moduleTypeId, module);
+    }
+
+    /**
+     * @dev Uninstalls a module of the given type with the given de-initialization data.
+     *
+     * For the fallback module type, the `deInitData` is expected to be the (packed) concatenation of a 4-byte
+     * selector and the rest of the data to be sent to the handler when calling {IERC7579Module-onUninstall}.
+     *
+     * Requirements:
+     *
+     * * Module must be already installed. Reverts with {ERC7579Utils-ERC7579UninstalledModule} otherwise.
+     */
+    function _uninstallModule(uint256 moduleTypeId, address module, bytes memory deInitData) internal virtual {
+        require(supportsModule(moduleTypeId), ERC7579Utils.ERC7579UnsupportedModuleType(moduleTypeId));
+
+        if (moduleTypeId == MODULE_TYPE_VALIDATOR) {
+            require(_validators.remove(module), ERC7579Utils.ERC7579UninstalledModule(moduleTypeId, module));
+        } else if (moduleTypeId == MODULE_TYPE_EXECUTOR) {
+            require(_executors.remove(module), ERC7579Utils.ERC7579UninstalledModule(moduleTypeId, module));
+        } else if (moduleTypeId == MODULE_TYPE_FALLBACK) {
+            bytes4 selector;
+            (selector, deInitData) = _decodeFallbackData(deInitData);
+            require(
+                _fallbackHandler(selector) == module && module != address(0),
+                ERC7579Utils.ERC7579UninstalledModule(moduleTypeId, module)
+            );
+            delete _fallbacks[selector];
+        }
+
+        IERC7579Module(module).onUninstall(deInitData);
+        emit ModuleUninstalled(moduleTypeId, module);
+    }
+
+    /**
+     * @dev Fallback function that delegates the call to the installed handler for the given selector.
+     *
+     * Reverts with {ERC7579MissingFallbackHandler} if the handler is not installed.
+     *
+     * Calls the handler with the original `msg.sender` appended at the end of the calldata following
+     * the ERC-2771 format.
+     */
+    function _fallback() internal virtual returns (bytes memory) {
+        address handler = _fallbackHandler(msg.sig);
+        require(handler != address(0), ERC7579MissingFallbackHandler(msg.sig));
+
+        // From https://eips.ethereum.org/EIPS/eip-7579#fallback[ERC-7579 specifications]:
+        // - MUST utilize ERC-2771 to add the original msg.sender to the calldata sent to the fallback handler
+        // - MUST use call to invoke the fallback handler
+        (bool success, bytes memory returndata) = handler.call{value: msg.value}(
+            abi.encodePacked(msg.data, msg.sender)
+        );
+
+        if (success) return returndata;
+
+        assembly ("memory-safe") {
+            revert(add(returndata, 0x20), mload(returndata))
+        }
+    }
+
+    /// @dev Returns the fallback handler for the given selector. Returns `address(0)` if not installed.
+    function _fallbackHandler(bytes4 selector) internal view virtual returns (address) {
+        return _fallbacks[selector];
+    }
+
+    /// @dev Checks if the module is installed. Reverts if the module is not installed.
+    function _checkModule(
+        uint256 moduleTypeId,
+        address module,
+        bytes calldata additionalContext
+    ) internal view virtual {
+        require(
+            isModuleInstalled(moduleTypeId, module, additionalContext),
+            ERC7579Utils.ERC7579UninstalledModule(moduleTypeId, module)
+        );
+    }
+
+    /**
+     * @dev Extracts the nonce validator from the user operation.
+     *
+     * To construct a nonce key, set nonce as follows:
+     *
+     * ```
+     * <module address (20 bytes)> | <key (4 bytes)> | <nonce (8 bytes)>
+     * ```
+     * NOTE: The default behavior of this function replicates the behavior of
+     * https://github.com/rhinestonewtf/safe7579/blob/bb29e8b1a66658790c4169e72608e27d220f79be/src/Safe7579.sol#L266[Safe adapter],
+     * https://github.com/etherspot/etherspot-prime-contracts/blob/cfcdb48c4172cea0d66038324c0bae3288aa8caa/src/modular-etherspot-wallet/wallet/ModularEtherspotWallet.sol#L227[Etherspot's Prime Account], and
+     * https://github.com/erc7579/erc7579-implementation/blob/16138d1afd4e9711f6c1425133538837bd7787b5/src/MSAAdvanced.sol#L247[ERC7579 reference implementation].
+     *
+     * This is not standardized in ERC-7579 (or in any follow-up ERC). Some accounts may want to override these internal functions.
+     *
+     * For example, https://github.com/bcnmy/nexus/blob/54f4e19baaff96081a8843672977caf712ef19f4/contracts/lib/NonceLib.sol#L17[Biconomy's Nexus]
+     * uses a similar yet incompatible approach (the validator address is also part of the nonce, but not at the same location)
+     */
+    function _extractUserOpValidator(PackedUserOperation calldata userOp) internal pure virtual returns (address) {
+        return address(bytes32(userOp.nonce).extract_32_20(0));
+    }
+
+    /**
+     * @dev Extracts the signature validator from the signature.
+     *
+     * To construct a signature, set the first 20 bytes as the module address and the remaining bytes as the
+     * signature data:
+     *
+     * ```
+     * <module address (20 bytes)> | <signature data>
+     * ```
+     *
+     * NOTE: The default behavior of this function replicates the behavior of
+     * https://github.com/rhinestonewtf/safe7579/blob/bb29e8b1a66658790c4169e72608e27d220f79be/src/Safe7579.sol#L350[Safe adapter],
+     * https://github.com/bcnmy/nexus/blob/54f4e19baaff96081a8843672977caf712ef19f4/contracts/Nexus.sol#L239[Biconomy's Nexus],
+     * https://github.com/etherspot/etherspot-prime-contracts/blob/cfcdb48c4172cea0d66038324c0bae3288aa8caa/src/modular-etherspot-wallet/wallet/ModularEtherspotWallet.sol#L252[Etherspot's Prime Account], and
+     * https://github.com/erc7579/erc7579-implementation/blob/16138d1afd4e9711f6c1425133538837bd7787b5/src/MSAAdvanced.sol#L296[ERC7579 reference implementation].
+     *
+     * This is not standardized in ERC-7579 (or in any follow-up ERC). Some accounts may want to override these internal functions.
+     */
+    function _extractSignatureValidator(
+        bytes calldata signature
+    ) internal pure virtual returns (address module, bytes calldata innerSignature) {
+        return (address(bytes20(signature[0:20])), signature[20:]);
+    }
+
+    /**
+     * @dev Extract the function selector from initData/deInitData for MODULE_TYPE_FALLBACK
+     *
+     * NOTE: If we had calldata here, we could use calldata slice which are cheaper to manipulate and don't require
+     * actual copy. However, this would require `_installModule` to get a calldata bytes object instead of a memory
+     * bytes object. This would prevent calling `_installModule` from a contract constructor and would force the use
+     * of external initializers. That may change in the future, as most accounts will probably be deployed as
+     * clones/proxy/ERC-7702 delegates and therefore rely on initializers anyway.
+     */
+    function _decodeFallbackData(
+        bytes memory data
+    ) internal pure virtual returns (bytes4 selector, bytes memory remaining) {
+        return (bytes4(data), data.slice(4));
+    }
+
+    /// @dev By default, only use the modules for validation of userOp and signature. Disable raw signatures.
+    function _rawSignatureValidation(
+        bytes32 /*hash*/,
+        bytes calldata /*signature*/
+    ) internal view virtual override returns (bool) {
+        return false;
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/account/extensions/draft-AccountERC7579Hooked.sol

@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (account/extensions/draft-AccountERC7579Hooked.sol)
+
+pragma solidity ^0.8.26;
+
+import {IERC7579Hook, MODULE_TYPE_HOOK} from "../../interfaces/draft-IERC7579.sol";
+import {ERC7579Utils, Mode} from "../../account/utils/draft-ERC7579Utils.sol";
+import {AccountERC7579} from "./draft-AccountERC7579.sol";
+
+/**
+ * @dev Extension of {AccountERC7579} with support for a single hook module (type 4).
+ *
+ * If installed, this extension will call the hook module's {IERC7579Hook-preCheck} before executing any operation
+ * with {_execute} (including {execute} and {executeFromExecutor} by default) and {IERC7579Hook-postCheck} thereafter.
+ *
+ * NOTE: Hook modules break the check-effect-interaction pattern. In particular, the {IERC7579Hook-preCheck} hook can
+ * lead to potentially dangerous reentrancy. Using the `withHook()` modifier is safe if no effect is performed
+ * before the preHook or after the postHook. That is the case on all functions here, but it may not be the case if
+ * functions that have this modifier are overridden. Developers should be extremely careful when implementing hook
+ * modules or further overriding functions that involve hooks.
+ */
+abstract contract AccountERC7579Hooked is AccountERC7579 {
+    address private _hook;
+
+    /// @dev A hook module is already present. This contract only supports one hook module.
+    error ERC7579HookModuleAlreadyPresent(address hook);
+
+    /**
+     * @dev Calls {IERC7579Hook-preCheck} before executing the modified function and {IERC7579Hook-postCheck}
+     * thereafter.
+     */
+    modifier withHook() {
+        address hook_ = hook();
+        bytes memory hookData;
+
+        // slither-disable-next-line reentrancy-no-eth
+        if (hook_ != address(0)) hookData = IERC7579Hook(hook_).preCheck(msg.sender, msg.value, msg.data);
+        _;
+        if (hook_ != address(0)) IERC7579Hook(hook_).postCheck(hookData);
+    }
+
+    /// @inheritdoc AccountERC7579
+    function accountId() public view virtual override returns (string memory) {
+        // vendorname.accountname.semver
+        return "@openzeppelin/community-contracts.AccountERC7579Hooked.v0.0.0";
+    }
+
+    /// @dev Returns the hook module address if installed, or `address(0)` otherwise.
+    function hook() public view virtual returns (address) {
+        return _hook;
+    }
+
+    /// @dev Supports hook modules. See {AccountERC7579-supportsModule}
+    function supportsModule(uint256 moduleTypeId) public view virtual override returns (bool) {
+        return moduleTypeId == MODULE_TYPE_HOOK || super.supportsModule(moduleTypeId);
+    }
+
+    /// @inheritdoc AccountERC7579
+    function isModuleInstalled(
+        uint256 moduleTypeId,
+        address module,
+        bytes calldata data
+    ) public view virtual override returns (bool) {
+        return
+            (moduleTypeId == MODULE_TYPE_HOOK && module == hook()) ||
+            super.isModuleInstalled(moduleTypeId, module, data);
+    }
+
+    /// @dev Installs a module with support for hook modules. See {AccountERC7579-_installModule}
+    function _installModule(
+        uint256 moduleTypeId,
+        address module,
+        bytes memory initData
+    ) internal virtual override withHook {
+        if (moduleTypeId == MODULE_TYPE_HOOK) {
+            require(_hook == address(0), ERC7579HookModuleAlreadyPresent(_hook));
+            _hook = module;
+        }
+        super._installModule(moduleTypeId, module, initData);
+    }
+
+    /// @dev Uninstalls a module with support for hook modules. See {AccountERC7579-_uninstallModule}
+    function _uninstallModule(
+        uint256 moduleTypeId,
+        address module,
+        bytes memory deInitData
+    ) internal virtual override withHook {
+        if (moduleTypeId == MODULE_TYPE_HOOK) {
+            require(_hook == module, ERC7579Utils.ERC7579UninstalledModule(moduleTypeId, module));
+            _hook = address(0);
+        }
+        super._uninstallModule(moduleTypeId, module, deInitData);
+    }
+
+    /// @dev Hooked version of {AccountERC7579-_execute}.
+    function _execute(
+        Mode mode,
+        bytes calldata executionCalldata
+    ) internal virtual override withHook returns (bytes[] memory) {
+        return super._execute(mode, executionCalldata);
+    }
+
+    /// @dev Hooked version of {AccountERC7579-_fallback}.
+    function _fallback() internal virtual override withHook returns (bytes memory) {
+        return super._fallback();
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/account/extensions/draft-ERC7821.sol

@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (account/extensions/draft-ERC7821.sol)
+
+pragma solidity ^0.8.20;
+
+import {ERC7579Utils, Mode, CallType, ExecType, ModeSelector} from "../utils/draft-ERC7579Utils.sol";
+import {IERC7821} from "../../interfaces/draft-IERC7821.sol";
+import {Account} from "../Account.sol";
+
+/**
+ * @dev Minimal batch executor following ERC-7821.
+ *
+ * Only supports supports single batch mode (`0x01000000000000000000`). Does not support optional "opData".
+ *
+ * @custom:stateless
+ */
+abstract contract ERC7821 is IERC7821 {
+    using ERC7579Utils for *;
+
+    error UnsupportedExecutionMode();
+
+    /**
+     * @dev Executes the calls in `executionData` with no optional `opData` support.
+     *
+     * NOTE: Access to this function is controlled by {_erc7821AuthorizedExecutor}. Changing access permissions, for
+     * example to approve calls by the ERC-4337 entrypoint, should be implemented by overriding it.
+     *
+     * Reverts and bubbles up error if any call fails.
+     */
+    function execute(bytes32 mode, bytes calldata executionData) public payable virtual {
+        if (!_erc7821AuthorizedExecutor(msg.sender, mode, executionData))
+            revert Account.AccountUnauthorized(msg.sender);
+        if (!supportsExecutionMode(mode)) revert UnsupportedExecutionMode();
+        executionData.execBatch(ERC7579Utils.EXECTYPE_DEFAULT);
+    }
+
+    /// @inheritdoc IERC7821
+    function supportsExecutionMode(bytes32 mode) public view virtual returns (bool result) {
+        (CallType callType, ExecType execType, ModeSelector modeSelector, ) = Mode.wrap(mode).decodeMode();
+        return
+            callType == ERC7579Utils.CALLTYPE_BATCH &&
+            execType == ERC7579Utils.EXECTYPE_DEFAULT &&
+            modeSelector == ModeSelector.wrap(0x00000000);
+    }
+
+    /**
+     * @dev Access control mechanism for the {execute} function.
+     * By default, only the contract itself is allowed to execute.
+     *
+     * Override this function to implement custom access control, for example to allow the
+     * ERC-4337 entrypoint to execute.
+     *
+     * ```solidity
+     * function _erc7821AuthorizedExecutor(
+     *   address caller,
+     *   bytes32 mode,
+     *   bytes calldata executionData
+     * ) internal view virtual override returns (bool) {
+     *   return caller == address(entryPoint()) || super._erc7821AuthorizedExecutor(caller, mode, executionData);
+     * }
+     * ```
+     */
+    function _erc7821AuthorizedExecutor(
+        address caller,
+        bytes32 /* mode */,
+        bytes calldata /* executionData */
+    ) internal view virtual returns (bool) {
+        return caller == address(this);
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/account/utils/EIP7702Utils.sol

@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (account/utils/EIP7702Utils.sol)
+
+pragma solidity ^0.8.20;
+
+/**
+ * @dev Library with common EIP-7702 utility functions.
+ *
+ * See https://eips.ethereum.org/EIPS/eip-7702[ERC-7702].
+ */
+library EIP7702Utils {
+    bytes3 internal constant EIP7702_PREFIX = 0xef0100;
+
+    /**
+     * @dev Returns the address of the delegate if `account` as an EIP-7702 delegation setup, or address(0) otherwise.
+     */
+    function fetchDelegate(address account) internal view returns (address) {
+        bytes23 delegation = bytes23(account.code);
+        return bytes3(delegation) == EIP7702_PREFIX ? address(bytes20(delegation << 24)) : address(0);
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/account/utils/draft-ERC4337Utils.sol

@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.3.0) (account/utils/draft-ERC4337Utils.sol)
+
+pragma solidity ^0.8.20;
+
+import {IEntryPoint, PackedUserOperation} from "../../interfaces/draft-IERC4337.sol";
+import {Math} from "../../utils/math/Math.sol";
+import {Calldata} from "../../utils/Calldata.sol";
+import {Packing} from "../../utils/Packing.sol";
+
+/// @dev This is available on all entrypoint since v0.4.0, but is not formally part of the ERC.
+interface IEntryPointExtra {
+    function getUserOpHash(PackedUserOperation calldata userOp) external view returns (bytes32);
+}
+
+/**
+ * @dev Library with common ERC-4337 utility functions.
+ *
+ * See https://eips.ethereum.org/EIPS/eip-4337[ERC-4337].
+ */
+library ERC4337Utils {
+    using Packing for *;
+
+    /// @dev Address of the entrypoint v0.7.0
+    IEntryPoint internal constant ENTRYPOINT_V07 = IEntryPoint(0x0000000071727De22E5E9d8BAf0edAc6f37da032);
+
+    /// @dev Address of the entrypoint v0.8.0
+    IEntryPoint internal constant ENTRYPOINT_V08 = IEntryPoint(0x4337084D9E255Ff0702461CF8895CE9E3b5Ff108);
+
+    /// @dev For simulation purposes, validateUserOp (and validatePaymasterUserOp) return this value on success.
+    uint256 internal constant SIG_VALIDATION_SUCCESS = 0;
+
+    /// @dev For simulation purposes, validateUserOp (and validatePaymasterUserOp) must return this value in case of signature failure, instead of revert.
+    uint256 internal constant SIG_VALIDATION_FAILED = 1;
+
+    /// @dev Parses the validation data into its components. See {packValidationData}.
+    function parseValidationData(
+        uint256 validationData
+    ) internal pure returns (address aggregator, uint48 validAfter, uint48 validUntil) {
+        validAfter = uint48(bytes32(validationData).extract_32_6(0));
+        validUntil = uint48(bytes32(validationData).extract_32_6(6));
+        aggregator = address(bytes32(validationData).extract_32_20(12));
+        if (validUntil == 0) validUntil = type(uint48).max;
+    }
+
+    /// @dev Packs the validation data into a single uint256. See {parseValidationData}.
+    function packValidationData(
+        address aggregator,
+        uint48 validAfter,
+        uint48 validUntil
+    ) internal pure returns (uint256) {
+        return uint256(bytes6(validAfter).pack_6_6(bytes6(validUntil)).pack_12_20(bytes20(aggregator)));
+    }
+
+    /// @dev Same as {packValidationData}, but with a boolean signature success flag.
+    function packValidationData(bool sigSuccess, uint48 validAfter, uint48 validUntil) internal pure returns (uint256) {
+        return
+            packValidationData(
+                address(uint160(Math.ternary(sigSuccess, SIG_VALIDATION_SUCCESS, SIG_VALIDATION_FAILED))),
+                validAfter,
+                validUntil
+            );
+    }
+
+    /**
+     * @dev Combines two validation data into a single one.
+     *
+     * The `aggregator` is set to {SIG_VALIDATION_SUCCESS} if both are successful, while
+     * the `validAfter` is the maximum and the `validUntil` is the minimum of both.
+     */
+    function combineValidationData(uint256 validationData1, uint256 validationData2) internal pure returns (uint256) {
+        (address aggregator1, uint48 validAfter1, uint48 validUntil1) = parseValidationData(validationData1);
+        (address aggregator2, uint48 validAfter2, uint48 validUntil2) = parseValidationData(validationData2);
+
+        bool success = aggregator1 == address(uint160(SIG_VALIDATION_SUCCESS)) &&
+            aggregator2 == address(uint160(SIG_VALIDATION_SUCCESS));
+        uint48 validAfter = uint48(Math.max(validAfter1, validAfter2));
+        uint48 validUntil = uint48(Math.min(validUntil1, validUntil2));
+        return packValidationData(success, validAfter, validUntil);
+    }
+
+    /// @dev Returns the aggregator of the `validationData` and whether it is out of time range.
+    function getValidationData(uint256 validationData) internal view returns (address aggregator, bool outOfTimeRange) {
+        (address aggregator_, uint48 validAfter, uint48 validUntil) = parseValidationData(validationData);
+        return (aggregator_, block.timestamp < validAfter || validUntil < block.timestamp);
+    }
+
+    /// @dev Get the hash of a user operation for a given entrypoint
+    function hash(PackedUserOperation calldata self, address entrypoint) internal view returns (bytes32) {
+        // NOTE: getUserOpHash is available since v0.4.0
+        //
+        // Prior to v0.8.0, this was easy to replicate for any entrypoint and chainId. Since v0.8.0 of the
+        // entrypoint, this depends on the Entrypoint's domain separator, which cannot be hardcoded and is complex
+        // to recompute. Domain separator could be fetch using the `getDomainSeparatorV4` getter, or recomputed from
+        // the ERC-5267 getter, but both operation would require doing a view call to the entrypoint. Overall it feels
+        // simpler and less error prone to get that functionality from the entrypoint directly.
+        return IEntryPointExtra(entrypoint).getUserOpHash(self);
+    }
+
+    /// @dev Returns `factory` from the {PackedUserOperation}, or address(0) if the initCode is empty or not properly formatted.
+    function factory(PackedUserOperation calldata self) internal pure returns (address) {
+        return self.initCode.length < 20 ? address(0) : address(bytes20(self.initCode[0:20]));
+    }
+
+    /// @dev Returns `factoryData` from the {PackedUserOperation}, or empty bytes if the initCode is empty or not properly formatted.
+    function factoryData(PackedUserOperation calldata self) internal pure returns (bytes calldata) {
+        return self.initCode.length < 20 ? Calldata.emptyBytes() : self.initCode[20:];
+    }
+
+    /// @dev Returns `verificationGasLimit` from the {PackedUserOperation}.
+    function verificationGasLimit(PackedUserOperation calldata self) internal pure returns (uint256) {
+        return uint128(self.accountGasLimits.extract_32_16(0));
+    }
+
+    /// @dev Returns `callGasLimit` from the {PackedUserOperation}.
+    function callGasLimit(PackedUserOperation calldata self) internal pure returns (uint256) {
+        return uint128(self.accountGasLimits.extract_32_16(16));
+    }
+
+    /// @dev Returns the first section of `gasFees` from the {PackedUserOperation}.
+    function maxPriorityFeePerGas(PackedUserOperation calldata self) internal pure returns (uint256) {
+        return uint128(self.gasFees.extract_32_16(0));
+    }
+
+    /// @dev Returns the second section of `gasFees` from the {PackedUserOperation}.
+    function maxFeePerGas(PackedUserOperation calldata self) internal pure returns (uint256) {
+        return uint128(self.gasFees.extract_32_16(16));
+    }
+
+    /// @dev Returns the total gas price for the {PackedUserOperation} (ie. `maxFeePerGas` or `maxPriorityFeePerGas + basefee`).
+    function gasPrice(PackedUserOperation calldata self) internal view returns (uint256) {
+        unchecked {
+            // Following values are "per gas"
+            uint256 maxPriorityFee = maxPriorityFeePerGas(self);
+            uint256 maxFee = maxFeePerGas(self);
+            return Math.min(maxFee, maxPriorityFee + block.basefee);
+        }
+    }
+
+    /// @dev Returns the first section of `paymasterAndData` from the {PackedUserOperation}.
+    function paymaster(PackedUserOperation calldata self) internal pure returns (address) {
+        return self.paymasterAndData.length < 52 ? address(0) : address(bytes20(self.paymasterAndData[0:20]));
+    }
+
+    /// @dev Returns the second section of `paymasterAndData` from the {PackedUserOperation}.
+    function paymasterVerificationGasLimit(PackedUserOperation calldata self) internal pure returns (uint256) {
+        return self.paymasterAndData.length < 52 ? 0 : uint128(bytes16(self.paymasterAndData[20:36]));
+    }
+
+    /// @dev Returns the third section of `paymasterAndData` from the {PackedUserOperation}.
+    function paymasterPostOpGasLimit(PackedUserOperation calldata self) internal pure returns (uint256) {
+        return self.paymasterAndData.length < 52 ? 0 : uint128(bytes16(self.paymasterAndData[36:52]));
+    }
+
+    /// @dev Returns the fourth section of `paymasterAndData` from the {PackedUserOperation}.
+    function paymasterData(PackedUserOperation calldata self) internal pure returns (bytes calldata) {
+        return self.paymasterAndData.length < 52 ? Calldata.emptyBytes() : self.paymasterAndData[52:];
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/account/utils/draft-ERC7579Utils.sol

@@ -0,0 +1,280 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (account/utils/draft-ERC7579Utils.sol)
+
+pragma solidity ^0.8.20;
+
+import {Execution} from "../../interfaces/draft-IERC7579.sol";
+import {Packing} from "../../utils/Packing.sol";
+import {Address} from "../../utils/Address.sol";
+
+type Mode is bytes32;
+type CallType is bytes1;
+type ExecType is bytes1;
+type ModeSelector is bytes4;
+type ModePayload is bytes22;
+
+/**
+ * @dev Library with common ERC-7579 utility functions.
+ *
+ * See https://eips.ethereum.org/EIPS/eip-7579[ERC-7579].
+ */
+// slither-disable-next-line unused-state
+library ERC7579Utils {
+    using Packing for *;
+
+    /// @dev A single `call` execution.
+    CallType internal constant CALLTYPE_SINGLE = CallType.wrap(0x00);
+
+    /// @dev A batch of `call` executions.
+    CallType internal constant CALLTYPE_BATCH = CallType.wrap(0x01);
+
+    /// @dev A `delegatecall` execution.
+    CallType internal constant CALLTYPE_DELEGATECALL = CallType.wrap(0xFF);
+
+    /// @dev Default execution type that reverts on failure.
+    ExecType internal constant EXECTYPE_DEFAULT = ExecType.wrap(0x00);
+
+    /// @dev Execution type that does not revert on failure.
+    ExecType internal constant EXECTYPE_TRY = ExecType.wrap(0x01);
+
+    /**
+     * @dev Emits when an {EXECTYPE_TRY} execution fails.
+     * @param batchExecutionIndex The index of the failed call in the execution batch.
+     * @param returndata The returned data from the failed call.
+     */
+    event ERC7579TryExecuteFail(uint256 batchExecutionIndex, bytes returndata);
+
+    /// @dev The provided {CallType} is not supported.
+    error ERC7579UnsupportedCallType(CallType callType);
+
+    /// @dev The provided {ExecType} is not supported.
+    error ERC7579UnsupportedExecType(ExecType execType);
+
+    /// @dev The provided module doesn't match the provided module type.
+    error ERC7579MismatchedModuleTypeId(uint256 moduleTypeId, address module);
+
+    /// @dev The module is not installed.
+    error ERC7579UninstalledModule(uint256 moduleTypeId, address module);
+
+    /// @dev The module is already installed.
+    error ERC7579AlreadyInstalledModule(uint256 moduleTypeId, address module);
+
+    /// @dev The module type is not supported.
+    error ERC7579UnsupportedModuleType(uint256 moduleTypeId);
+
+    /// @dev Input calldata not properly formatted and possibly malicious.
+    error ERC7579DecodingError();
+
+    /// @dev Executes a single call.
+    function execSingle(
+        bytes calldata executionCalldata,
+        ExecType execType
+    ) internal returns (bytes[] memory returnData) {
+        (address target, uint256 value, bytes calldata callData) = decodeSingle(executionCalldata);
+        returnData = new bytes[](1);
+        returnData[0] = _call(0, execType, target, value, callData);
+    }
+
+    /// @dev Executes a batch of calls.
+    function execBatch(
+        bytes calldata executionCalldata,
+        ExecType execType
+    ) internal returns (bytes[] memory returnData) {
+        Execution[] calldata executionBatch = decodeBatch(executionCalldata);
+        returnData = new bytes[](executionBatch.length);
+        for (uint256 i = 0; i < executionBatch.length; ++i) {
+            returnData[i] = _call(
+                i,
+                execType,
+                executionBatch[i].target,
+                executionBatch[i].value,
+                executionBatch[i].callData
+            );
+        }
+    }
+
+    /// @dev Executes a delegate call.
+    function execDelegateCall(
+        bytes calldata executionCalldata,
+        ExecType execType
+    ) internal returns (bytes[] memory returnData) {
+        (address target, bytes calldata callData) = decodeDelegate(executionCalldata);
+        returnData = new bytes[](1);
+        returnData[0] = _delegatecall(0, execType, target, callData);
+    }
+
+    /// @dev Encodes the mode with the provided parameters. See {decodeMode}.
+    function encodeMode(
+        CallType callType,
+        ExecType execType,
+        ModeSelector selector,
+        ModePayload payload
+    ) internal pure returns (Mode mode) {
+        return
+            Mode.wrap(
+                CallType
+                    .unwrap(callType)
+                    .pack_1_1(ExecType.unwrap(execType))
+                    .pack_2_4(bytes4(0))
+                    .pack_6_4(ModeSelector.unwrap(selector))
+                    .pack_10_22(ModePayload.unwrap(payload))
+            );
+    }
+
+    /// @dev Decodes the mode into its parameters. See {encodeMode}.
+    function decodeMode(
+        Mode mode
+    ) internal pure returns (CallType callType, ExecType execType, ModeSelector selector, ModePayload payload) {
+        return (
+            CallType.wrap(Packing.extract_32_1(Mode.unwrap(mode), 0)),
+            ExecType.wrap(Packing.extract_32_1(Mode.unwrap(mode), 1)),
+            ModeSelector.wrap(Packing.extract_32_4(Mode.unwrap(mode), 6)),
+            ModePayload.wrap(Packing.extract_32_22(Mode.unwrap(mode), 10))
+        );
+    }
+
+    /// @dev Encodes a single call execution. See {decodeSingle}.
+    function encodeSingle(
+        address target,
+        uint256 value,
+        bytes calldata callData
+    ) internal pure returns (bytes memory executionCalldata) {
+        return abi.encodePacked(target, value, callData);
+    }
+
+    /// @dev Decodes a single call execution. See {encodeSingle}.
+    function decodeSingle(
+        bytes calldata executionCalldata
+    ) internal pure returns (address target, uint256 value, bytes calldata callData) {
+        target = address(bytes20(executionCalldata[0:20]));
+        value = uint256(bytes32(executionCalldata[20:52]));
+        callData = executionCalldata[52:];
+    }
+
+    /// @dev Encodes a delegate call execution. See {decodeDelegate}.
+    function encodeDelegate(
+        address target,
+        bytes calldata callData
+    ) internal pure returns (bytes memory executionCalldata) {
+        return abi.encodePacked(target, callData);
+    }
+
+    /// @dev Decodes a delegate call execution. See {encodeDelegate}.
+    function decodeDelegate(
+        bytes calldata executionCalldata
+    ) internal pure returns (address target, bytes calldata callData) {
+        target = address(bytes20(executionCalldata[0:20]));
+        callData = executionCalldata[20:];
+    }
+
+    /// @dev Encodes a batch of executions. See {decodeBatch}.
+    function encodeBatch(Execution[] memory executionBatch) internal pure returns (bytes memory executionCalldata) {
+        return abi.encode(executionBatch);
+    }
+
+    /// @dev Decodes a batch of executions. See {encodeBatch}.
+    ///
+    /// NOTE: This function runs some checks and will throw a {ERC7579DecodingError} if the input is not properly formatted.
+    function decodeBatch(bytes calldata executionCalldata) internal pure returns (Execution[] calldata executionBatch) {
+        unchecked {
+            uint256 bufferLength = executionCalldata.length;
+
+            // Check executionCalldata is not empty.
+            if (bufferLength < 32) revert ERC7579DecodingError();
+
+            // Get the offset of the array (pointer to the array length).
+            uint256 arrayLengthOffset = uint256(bytes32(executionCalldata[0:32]));
+
+            // The array length (at arrayLengthOffset) should be 32 bytes long. We check that this is within the
+            // buffer bounds. Since we know bufferLength is at least 32, we can subtract with no overflow risk.
+            if (arrayLengthOffset > bufferLength - 32) revert ERC7579DecodingError();
+
+            // Get the array length. arrayLengthOffset + 32 is bounded by bufferLength so it does not overflow.
+            uint256 arrayLength = uint256(bytes32(executionCalldata[arrayLengthOffset:arrayLengthOffset + 32]));
+
+            // Check that the buffer is long enough to store the array elements as "offset pointer":
+            // - each element of the array is an "offset pointer" to the data.
+            // - each "offset pointer" (to an array element) takes 32 bytes.
+            // - validity of the calldata at that location is checked when the array element is accessed, so we only
+            //   need to check that the buffer is large enough to hold the pointers.
+            //
+            // Since we know bufferLength is at least arrayLengthOffset + 32, we can subtract with no overflow risk.
+            // Solidity limits length of such arrays to 2**64-1, this guarantees `arrayLength * 32` does not overflow.
+            if (arrayLength > type(uint64).max || bufferLength - arrayLengthOffset - 32 < arrayLength * 32)
+                revert ERC7579DecodingError();
+
+            assembly ("memory-safe") {
+                executionBatch.offset := add(add(executionCalldata.offset, arrayLengthOffset), 0x20)
+                executionBatch.length := arrayLength
+            }
+        }
+    }
+
+    /// @dev Executes a `call` to the target with the provided {ExecType}.
+    function _call(
+        uint256 index,
+        ExecType execType,
+        address target,
+        uint256 value,
+        bytes calldata data
+    ) private returns (bytes memory) {
+        (bool success, bytes memory returndata) = (target == address(0) ? address(this) : target).call{value: value}(
+            data
+        );
+        return _validateExecutionMode(index, execType, success, returndata);
+    }
+
+    /// @dev Executes a `delegatecall` to the target with the provided {ExecType}.
+    function _delegatecall(
+        uint256 index,
+        ExecType execType,
+        address target,
+        bytes calldata data
+    ) private returns (bytes memory) {
+        (bool success, bytes memory returndata) = (target == address(0) ? address(this) : target).delegatecall(data);
+        return _validateExecutionMode(index, execType, success, returndata);
+    }
+
+    /// @dev Validates the execution mode and returns the returndata.
+    function _validateExecutionMode(
+        uint256 index,
+        ExecType execType,
+        bool success,
+        bytes memory returndata
+    ) private returns (bytes memory) {
+        if (execType == ERC7579Utils.EXECTYPE_DEFAULT) {
+            Address.verifyCallResult(success, returndata);
+        } else if (execType == ERC7579Utils.EXECTYPE_TRY) {
+            if (!success) emit ERC7579TryExecuteFail(index, returndata);
+        } else {
+            revert ERC7579UnsupportedExecType(execType);
+        }
+        return returndata;
+    }
+}
+
+// Operators
+using {eqCallType as ==} for CallType global;
+using {eqExecType as ==} for ExecType global;
+using {eqModeSelector as ==} for ModeSelector global;
+using {eqModePayload as ==} for ModePayload global;
+
+/// @dev Compares two `CallType` values for equality.
+function eqCallType(CallType a, CallType b) pure returns (bool) {
+    return CallType.unwrap(a) == CallType.unwrap(b);
+}
+
+/// @dev Compares two `ExecType` values for equality.
+function eqExecType(ExecType a, ExecType b) pure returns (bool) {
+    return ExecType.unwrap(a) == ExecType.unwrap(b);
+}
+
+/// @dev Compares two `ModeSelector` values for equality.
+function eqModeSelector(ModeSelector a, ModeSelector b) pure returns (bool) {
+    return ModeSelector.unwrap(a) == ModeSelector.unwrap(b);
+}
+
+/// @dev Compares two `ModePayload` values for equality.
+function eqModePayload(ModePayload a, ModePayload b) pure returns (bool) {
+    return ModePayload.unwrap(a) == ModePayload.unwrap(b);
+}