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/utils/cryptography/signers/AbstractSigner.sol

@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (utils/cryptography/signers/AbstractSigner.sol)
+
+pragma solidity ^0.8.20;
+
+/**
+ * @dev Abstract contract for signature validation.
+ *
+ * Developers must implement {_rawSignatureValidation} and use it as the lowest-level signature validation mechanism.
+ *
+ * @custom:stateless
+ */
+abstract contract AbstractSigner {
+    /**
+     * @dev Signature validation algorithm.
+     *
+     * WARNING: Implementing a signature validation algorithm is a security-sensitive operation as it involves
+     * cryptographic verification. It is important to review and test thoroughly before deployment. Consider
+     * using one of the signature verification libraries (xref:api:utils/cryptography#ECDSA[ECDSA],
+     * xref:api:utils/cryptography#P256[P256] or xref:api:utils/cryptography#RSA[RSA]).
+     */
+    function _rawSignatureValidation(bytes32 hash, bytes calldata signature) internal view virtual returns (bool);
+}

dev/env/node_modules/@openzeppelin/contracts/utils/cryptography/signers/MultiSignerERC7913.sol

@@ -0,0 +1,252 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (utils/cryptography/signers/MultiSignerERC7913.sol)
+
+pragma solidity ^0.8.26;
+
+import {AbstractSigner} from "./AbstractSigner.sol";
+import {SignatureChecker} from "../SignatureChecker.sol";
+import {EnumerableSet} from "../../structs/EnumerableSet.sol";
+
+/**
+ * @dev Implementation of {AbstractSigner} using multiple ERC-7913 signers with a threshold-based
+ * signature verification system.
+ *
+ * This contract allows managing a set of authorized signers and requires a minimum number of
+ * signatures (threshold) to approve operations. It uses ERC-7913 formatted signers, which
+ * makes it natively compatible with ECDSA and ERC-1271 signers.
+ *
+ * Example of usage:
+ *
+ * ```solidity
+ * contract MyMultiSignerAccount is Account, MultiSignerERC7913, Initializable {
+ *     function initialize(bytes[] memory signers, uint64 threshold) public initializer {
+ *         _addSigners(signers);
+ *         _setThreshold(threshold);
+ *     }
+ *
+ *     function addSigners(bytes[] memory signers) public onlyEntryPointOrSelf {
+ *         _addSigners(signers);
+ *     }
+ *
+ *     function removeSigners(bytes[] memory signers) public onlyEntryPointOrSelf {
+ *         _removeSigners(signers);
+ *     }
+ *
+ *     function setThreshold(uint64 threshold) public onlyEntryPointOrSelf {
+ *         _setThreshold(threshold);
+ *     }
+ * }
+ * ```
+ *
+ * IMPORTANT: Failing to properly initialize the signers and threshold either during construction
+ * (if used standalone) or during initialization (if used as a clone) may leave the contract
+ * either front-runnable or unusable.
+ */
+abstract contract MultiSignerERC7913 is AbstractSigner {
+    using EnumerableSet for EnumerableSet.BytesSet;
+    using SignatureChecker for *;
+
+    EnumerableSet.BytesSet private _signers;
+    uint64 private _threshold;
+
+    /// @dev Emitted when a signer is added.
+    event ERC7913SignerAdded(bytes indexed signers);
+
+    /// @dev Emitted when a signers is removed.
+    event ERC7913SignerRemoved(bytes indexed signers);
+
+    /// @dev Emitted when the threshold is updated.
+    event ERC7913ThresholdSet(uint64 threshold);
+
+    /// @dev The `signer` already exists.
+    error MultiSignerERC7913AlreadyExists(bytes signer);
+
+    /// @dev The `signer` does not exist.
+    error MultiSignerERC7913NonexistentSigner(bytes signer);
+
+    /// @dev The `signer` is less than 20 bytes long.
+    error MultiSignerERC7913InvalidSigner(bytes signer);
+
+    /// @dev The `threshold` is zero.
+    error MultiSignerERC7913ZeroThreshold();
+
+    /// @dev The `threshold` is unreachable given the number of `signers`.
+    error MultiSignerERC7913UnreachableThreshold(uint64 signers, uint64 threshold);
+
+    constructor(bytes[] memory signers_, uint64 threshold_) {
+        _addSigners(signers_);
+        _setThreshold(threshold_);
+    }
+
+    /**
+     * @dev Returns a slice of the set of authorized signers.
+     *
+     * Using `start = 0` and `end = type(uint64).max` will return the entire set of signers.
+     *
+     * WARNING: Depending on the `start` and `end`, this operation can copy a large amount of data to memory, which
+     * can be expensive. This is designed for view accessors queried without gas fees. Using it in state-changing
+     * functions may become uncallable if the slice grows too large.
+     */
+    function getSigners(uint64 start, uint64 end) public view virtual returns (bytes[] memory) {
+        return _signers.values(start, end);
+    }
+
+    /// @dev Returns the number of authorized signers
+    function getSignerCount() public view virtual returns (uint256) {
+        return _signers.length();
+    }
+
+    /// @dev Returns whether the `signer` is an authorized signer.
+    function isSigner(bytes memory signer) public view virtual returns (bool) {
+        return _signers.contains(signer);
+    }
+
+    /// @dev Returns the minimum number of signers required to approve a multisignature operation.
+    function threshold() public view virtual returns (uint64) {
+        return _threshold;
+    }
+
+    /**
+     * @dev Adds the `newSigners` to those allowed to sign on behalf of this contract.
+     * Internal version without access control.
+     *
+     * Requirements:
+     *
+     * * Each of `newSigners` must be at least 20 bytes long. Reverts with {MultiSignerERC7913InvalidSigner} if not.
+     * * Each of `newSigners` must not be authorized. See {isSigner}. Reverts with {MultiSignerERC7913AlreadyExists} if so.
+     */
+    function _addSigners(bytes[] memory newSigners) internal virtual {
+        for (uint256 i = 0; i < newSigners.length; ++i) {
+            bytes memory signer = newSigners[i];
+            require(signer.length >= 20, MultiSignerERC7913InvalidSigner(signer));
+            require(_signers.add(signer), MultiSignerERC7913AlreadyExists(signer));
+            emit ERC7913SignerAdded(signer);
+        }
+    }
+
+    /**
+     * @dev Removes the `oldSigners` from the authorized signers. Internal version without access control.
+     *
+     * Requirements:
+     *
+     * * Each of `oldSigners` must be authorized. See {isSigner}. Otherwise {MultiSignerERC7913NonexistentSigner} is thrown.
+     * * See {_validateReachableThreshold} for the threshold validation.
+     */
+    function _removeSigners(bytes[] memory oldSigners) internal virtual {
+        for (uint256 i = 0; i < oldSigners.length; ++i) {
+            bytes memory signer = oldSigners[i];
+            require(_signers.remove(signer), MultiSignerERC7913NonexistentSigner(signer));
+            emit ERC7913SignerRemoved(signer);
+        }
+        _validateReachableThreshold();
+    }
+
+    /**
+     * @dev Sets the signatures `threshold` required to approve a multisignature operation.
+     * Internal version without access control.
+     *
+     * Requirements:
+     *
+     * * See {_validateReachableThreshold} for the threshold validation.
+     */
+    function _setThreshold(uint64 newThreshold) internal virtual {
+        require(newThreshold > 0, MultiSignerERC7913ZeroThreshold());
+        _threshold = newThreshold;
+        _validateReachableThreshold();
+        emit ERC7913ThresholdSet(newThreshold);
+    }
+
+    /**
+     * @dev Validates the current threshold is reachable.
+     *
+     * Requirements:
+     *
+     * * The {getSignerCount} must be greater or equal than to the {threshold}. Throws
+     * {MultiSignerERC7913UnreachableThreshold} if not.
+     */
+    function _validateReachableThreshold() internal view virtual {
+        uint256 signersLength = _signers.length();
+        uint64 currentThreshold = threshold();
+        require(
+            signersLength >= currentThreshold,
+            MultiSignerERC7913UnreachableThreshold(
+                uint64(signersLength), // Safe cast. Economically impossible to overflow.
+                currentThreshold
+            )
+        );
+    }
+
+    /**
+     * @dev Decodes, validates the signature and checks the signers are authorized.
+     * See {_validateSignatures} and {_validateThreshold} for more details.
+     *
+     * Example of signature encoding:
+     *
+     * ```solidity
+     * // Encode signers (verifier || key)
+     * bytes memory signer1 = abi.encodePacked(verifier1, key1);
+     * bytes memory signer2 = abi.encodePacked(verifier2, key2);
+     *
+     * // Order signers by their id
+     * if (keccak256(signer1) > keccak256(signer2)) {
+     *     (signer1, signer2) = (signer2, signer1);
+     *     (signature1, signature2) = (signature2, signature1);
+     * }
+     *
+     * // Assign ordered signers and signatures
+     * bytes[] memory signers = new bytes[](2);
+     * bytes[] memory signatures = new bytes[](2);
+     * signers[0] = signer1;
+     * signatures[0] = signature1;
+     * signers[1] = signer2;
+     * signatures[1] = signature2;
+     *
+     * // Encode the multi signature
+     * bytes memory signature = abi.encode(signers, signatures);
+     * ```
+     *
+     * Requirements:
+     *
+     * * The `signature` must be encoded as `abi.encode(signers, signatures)`.
+     */
+    function _rawSignatureValidation(
+        bytes32 hash,
+        bytes calldata signature
+    ) internal view virtual override returns (bool) {
+        if (signature.length == 0) return false; // For ERC-7739 compatibility
+        (bytes[] memory signers, bytes[] memory signatures) = abi.decode(signature, (bytes[], bytes[]));
+        return _validateThreshold(signers) && _validateSignatures(hash, signers, signatures);
+    }
+
+    /**
+     * @dev Validates the signatures using the signers and their corresponding signatures.
+     * Returns whether the signers are authorized and the signatures are valid for the given hash.
+     *
+     * IMPORTANT: Sorting the signers by their `keccak256` hash will improve the gas efficiency of this function.
+     * See {SignatureChecker-areValidSignaturesNow-bytes32-bytes[]-bytes[]} for more details.
+     *
+     * Requirements:
+     *
+     * * The `signatures` and `signers` arrays must be equal in length. Returns false otherwise.
+     */
+    function _validateSignatures(
+        bytes32 hash,
+        bytes[] memory signers,
+        bytes[] memory signatures
+    ) internal view virtual returns (bool valid) {
+        for (uint256 i = 0; i < signers.length; ++i) {
+            if (!isSigner(signers[i])) {
+                return false;
+            }
+        }
+        return hash.areValidSignaturesNow(signers, signatures);
+    }
+
+    /**
+     * @dev Validates that the number of signers meets the {threshold} requirement.
+     * Assumes the signers were already validated. See {_validateSignatures} for more details.
+     */
+    function _validateThreshold(bytes[] memory validatingSigners) internal view virtual returns (bool) {
+        return validatingSigners.length >= threshold();
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/utils/cryptography/signers/MultiSignerERC7913Weighted.sol

@@ -0,0 +1,208 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (utils/cryptography/signers/MultiSignerERC7913Weighted.sol)
+
+pragma solidity ^0.8.26;
+
+import {SafeCast} from "../../math/SafeCast.sol";
+import {MultiSignerERC7913} from "./MultiSignerERC7913.sol";
+
+/**
+ * @dev Extension of {MultiSignerERC7913} that supports weighted signatures.
+ *
+ * This contract allows assigning different weights to each signer, enabling more
+ * flexible governance schemes. For example, some signers could have higher weight
+ * than others, allowing for weighted voting or prioritized authorization.
+ *
+ * Example of usage:
+ *
+ * ```solidity
+ * contract MyWeightedMultiSignerAccount is Account, MultiSignerERC7913Weighted, Initializable {
+ *     function initialize(bytes[] memory signers, uint64[] memory weights, uint64 threshold) public initializer {
+ *         _addSigners(signers);
+ *         _setSignerWeights(signers, weights);
+ *         _setThreshold(threshold);
+ *     }
+ *
+ *     function addSigners(bytes[] memory signers) public onlyEntryPointOrSelf {
+ *         _addSigners(signers);
+ *     }
+ *
+ *     function removeSigners(bytes[] memory signers) public onlyEntryPointOrSelf {
+ *         _removeSigners(signers);
+ *     }
+ *
+ *     function setThreshold(uint64 threshold) public onlyEntryPointOrSelf {
+ *         _setThreshold(threshold);
+ *     }
+ *
+ *     function setSignerWeights(bytes[] memory signers, uint64[] memory weights) public onlyEntryPointOrSelf {
+ *         _setSignerWeights(signers, weights);
+ *     }
+ * }
+ * ```
+ *
+ * IMPORTANT: When setting a threshold value, ensure it matches the scale used for signer weights.
+ * For example, if signers have weights like 1, 2, or 3, then a threshold of 4 would require at
+ * least two signers (e.g., one with weight 1 and one with weight 3). See {signerWeight}.
+ */
+abstract contract MultiSignerERC7913Weighted is MultiSignerERC7913 {
+    using SafeCast for *;
+
+    // Sum of all the extra weights of all signers. Storage packed with `MultiSignerERC7913._threshold`
+    uint64 private _totalExtraWeight;
+
+    // Mapping from signer to extraWeight (in addition to all authorized signers having weight 1)
+    mapping(bytes signer => uint64) private _extraWeights;
+
+    /**
+     * @dev Emitted when a signer's weight is changed.
+     *
+     * NOTE: Not emitted in {_addSigners} or {_removeSigners}. Indexers must rely on {ERC7913SignerAdded}
+     * and {ERC7913SignerRemoved} to index a default weight of 1. See {signerWeight}.
+     */
+    event ERC7913SignerWeightChanged(bytes indexed signer, uint64 weight);
+
+    /// @dev Thrown when a signer's weight is invalid.
+    error MultiSignerERC7913WeightedInvalidWeight(bytes signer, uint64 weight);
+
+    /// @dev Thrown when the arrays lengths don't match. See {_setSignerWeights}.
+    error MultiSignerERC7913WeightedMismatchedLength();
+
+    constructor(bytes[] memory signers_, uint64[] memory weights_, uint64 threshold_) MultiSignerERC7913(signers_, 1) {
+        _setSignerWeights(signers_, weights_);
+        _setThreshold(threshold_);
+    }
+
+    /// @dev Gets the weight of a signer. Returns 0 if the signer is not authorized.
+    function signerWeight(bytes memory signer) public view virtual returns (uint64) {
+        unchecked {
+            // Safe cast, _setSignerWeights guarantees 1+_extraWeights is a uint64
+            return uint64(isSigner(signer).toUint() * (1 + _extraWeights[signer]));
+        }
+    }
+
+    /// @dev Gets the total weight of all signers.
+    function totalWeight() public view virtual returns (uint64) {
+        return (getSignerCount() + _totalExtraWeight).toUint64();
+    }
+
+    /**
+     * @dev Sets weights for multiple signers at once. Internal version without access control.
+     *
+     * Requirements:
+     *
+     * * `signers` and `weights` arrays must have the same length. Reverts with {MultiSignerERC7913WeightedMismatchedLength} on mismatch.
+     * * Each signer must exist in the set of authorized signers. Otherwise reverts with {MultiSignerERC7913NonexistentSigner}
+     * * Each weight must be greater than 0. Otherwise reverts with {MultiSignerERC7913WeightedInvalidWeight}
+     * * See {_validateReachableThreshold} for the threshold validation.
+     *
+     * Emits {ERC7913SignerWeightChanged} for each signer.
+     */
+    function _setSignerWeights(bytes[] memory signers, uint64[] memory weights) internal virtual {
+        require(signers.length == weights.length, MultiSignerERC7913WeightedMismatchedLength());
+
+        uint256 extraWeightAdded = 0;
+        uint256 extraWeightRemoved = 0;
+        for (uint256 i = 0; i < signers.length; ++i) {
+            bytes memory signer = signers[i];
+            require(isSigner(signer), MultiSignerERC7913NonexistentSigner(signer));
+
+            uint64 weight = weights[i];
+            require(weight > 0, MultiSignerERC7913WeightedInvalidWeight(signer, weight));
+
+            unchecked {
+                uint64 oldExtraWeight = _extraWeights[signer];
+                uint64 newExtraWeight = weight - 1;
+
+                if (oldExtraWeight != newExtraWeight) {
+                    // Overflow impossible: weight values are bounded by uint64 and economic constraints
+                    extraWeightRemoved += oldExtraWeight;
+                    extraWeightAdded += _extraWeights[signer] = newExtraWeight;
+                    emit ERC7913SignerWeightChanged(signer, weight);
+                }
+            }
+        }
+        unchecked {
+            // Safe from underflow: `extraWeightRemoved` is bounded by `_totalExtraWeight` by construction
+            // and weight values are bounded by uint64 and economic constraints
+            _totalExtraWeight = (uint256(_totalExtraWeight) + extraWeightAdded - extraWeightRemoved).toUint64();
+        }
+        _validateReachableThreshold();
+    }
+
+    /**
+     * @dev See {MultiSignerERC7913-_addSigners}.
+     *
+     * In cases where {totalWeight} is almost `type(uint64).max` (due to a large `_totalExtraWeight`), adding new
+     * signers could cause the {totalWeight} computation to overflow. Adding a {totalWeight} calls after the new
+     * signers are added ensures no such overflow happens.
+     */
+    function _addSigners(bytes[] memory newSigners) internal virtual override {
+        super._addSigners(newSigners);
+
+        // This will revert if the new signers cause an overflow
+        _validateReachableThreshold();
+    }
+
+    /**
+     * @dev See {MultiSignerERC7913-_removeSigners}.
+     *
+     * Just like {_addSigners}, this function does not emit {ERC7913SignerWeightChanged} events. The
+     * {ERC7913SignerRemoved} event emitted by {MultiSignerERC7913-_removeSigners} is enough to track weights here.
+     */
+    function _removeSigners(bytes[] memory signers) internal virtual override {
+        // Clean up weights for removed signers
+        //
+        // The `extraWeightRemoved` is bounded by `_totalExtraWeight`. The `super._removeSigners` function will revert
+        // if the signers array contains any duplicates, ensuring each signer's weight is only counted once. Since
+        // `_totalExtraWeight` is stored as a `uint64`, the final subtraction operation is also safe.
+        unchecked {
+            uint64 extraWeightRemoved = 0;
+            for (uint256 i = 0; i < signers.length; ++i) {
+                bytes memory signer = signers[i];
+
+                extraWeightRemoved += _extraWeights[signer];
+                delete _extraWeights[signer];
+            }
+            _totalExtraWeight -= extraWeightRemoved;
+        }
+        super._removeSigners(signers);
+    }
+
+    /**
+     * @dev Sets the threshold for the multisignature operation. Internal version without access control.
+     *
+     * Requirements:
+     *
+     * * The {totalWeight} must be `>=` the {threshold}. Otherwise reverts with {MultiSignerERC7913UnreachableThreshold}
+     *
+     * NOTE: This function intentionally does not call `super._validateReachableThreshold` because the base implementation
+     * assumes each signer has a weight of 1, which is a subset of this weighted implementation. Consider that multiple
+     * implementations of this function may exist in the contract, so important side effects may be missed
+     * depending on the linearization order.
+     */
+    function _validateReachableThreshold() internal view virtual override {
+        uint64 weight = totalWeight();
+        uint64 currentThreshold = threshold();
+        require(weight >= currentThreshold, MultiSignerERC7913UnreachableThreshold(weight, currentThreshold));
+    }
+
+    /**
+     * @dev Validates that the total weight of signers meets the threshold requirement.
+     *
+     * NOTE: This function intentionally does not call `super._validateThreshold` because the base implementation
+     * assumes each signer has a weight of 1, which is a subset of this weighted implementation. Consider that multiple
+     * implementations of this function may exist in the contract, so important side effects may be missed
+     * depending on the linearization order.
+     */
+    function _validateThreshold(bytes[] memory signers) internal view virtual override returns (bool) {
+        unchecked {
+            uint64 weight = 0;
+            for (uint256 i = 0; i < signers.length; ++i) {
+                // Overflow impossible: weight values are bounded by uint64 and economic constraints
+                weight += signerWeight(signers[i]);
+            }
+            return weight >= threshold();
+        }
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/utils/cryptography/signers/SignerECDSA.sol

@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (utils/cryptography/signers/SignerECDSA.sol)
+
+pragma solidity ^0.8.20;
+
+import {AbstractSigner} from "./AbstractSigner.sol";
+import {ECDSA} from "../ECDSA.sol";
+
+/**
+ * @dev Implementation of {AbstractSigner} using xref:api:utils/cryptography#ECDSA[ECDSA] signatures.
+ *
+ * For {Account} usage, a {_setSigner} function is provided to set the {signer} address.
+ * Doing so is easier for a factory, who is likely to use initializable clones of this contract.
+ *
+ * Example of usage:
+ *
+ * ```solidity
+ * contract MyAccountECDSA is Account, SignerECDSA, Initializable {
+ *     function initialize(address signerAddr) public initializer {
+ *       _setSigner(signerAddr);
+ *     }
+ * }
+ * ```
+ *
+ * IMPORTANT: Failing to call {_setSigner} either during construction (if used standalone)
+ * or during initialization (if used as a clone) may leave the signer either front-runnable or unusable.
+ */
+abstract contract SignerECDSA is AbstractSigner {
+    address private _signer;
+
+    constructor(address signerAddr) {
+        _setSigner(signerAddr);
+    }
+
+    /**
+     * @dev Sets the signer with the address of the native signer. This function should be called during construction
+     * or through an initializer.
+     */
+    function _setSigner(address signerAddr) internal {
+        _signer = signerAddr;
+    }
+
+    /// @dev Return the signer's address.
+    function signer() public view virtual returns (address) {
+        return _signer;
+    }
+
+    /// @inheritdoc AbstractSigner
+    function _rawSignatureValidation(
+        bytes32 hash,
+        bytes calldata signature
+    ) internal view virtual override returns (bool) {
+        (address recovered, ECDSA.RecoverError err, ) = ECDSA.tryRecover(hash, signature);
+        return signer() == recovered && err == ECDSA.RecoverError.NoError;
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/utils/cryptography/signers/SignerERC7702.sol

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (utils/cryptography/signers/SignerERC7702.sol)
+
+pragma solidity ^0.8.20;
+
+import {AbstractSigner} from "./AbstractSigner.sol";
+import {ECDSA} from "../ECDSA.sol";
+
+/**
+ * @dev Implementation of {AbstractSigner} for implementation for an EOA. Useful for ERC-7702 accounts.
+ *
+ * @custom:stateless
+ */
+abstract contract SignerERC7702 is AbstractSigner {
+    /**
+     * @dev Validates the signature using the EOA's address (i.e. `address(this)`).
+     */
+    function _rawSignatureValidation(
+        bytes32 hash,
+        bytes calldata signature
+    ) internal view virtual override returns (bool) {
+        (address recovered, ECDSA.RecoverError err, ) = ECDSA.tryRecover(hash, signature);
+        return address(this) == recovered && err == ECDSA.RecoverError.NoError;
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/utils/cryptography/signers/SignerERC7913.sol

@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (utils/cryptography/signers/SignerERC7913.sol)
+
+pragma solidity ^0.8.24;
+
+import {AbstractSigner} from "./AbstractSigner.sol";
+import {SignatureChecker} from "../SignatureChecker.sol";
+
+/**
+ * @dev Implementation of {AbstractSigner} using
+ * https://eips.ethereum.org/EIPS/eip-7913[ERC-7913] signature verification.
+ *
+ * For {Account} usage, a {_setSigner} function is provided to set the ERC-7913 formatted {signer}.
+ * Doing so is easier for a factory, who is likely to use initializable clones of this contract.
+ *
+ * The signer is a `bytes` object that concatenates a verifier address and a key: `verifier || key`.
+ *
+ * Example of usage:
+ *
+ * ```solidity
+ * contract MyAccountERC7913 is Account, SignerERC7913, Initializable {
+ *     function initialize(bytes memory signer_) public initializer {
+ *       _setSigner(signer_);
+ *     }
+ *
+ *     function setSigner(bytes memory signer_) public onlyEntryPointOrSelf {
+ *       _setSigner(signer_);
+ *     }
+ * }
+ * ```
+ *
+ * IMPORTANT: Failing to call {_setSigner} either during construction (if used standalone)
+ * or during initialization (if used as a clone) may leave the signer either front-runnable or unusable.
+ */
+
+abstract contract SignerERC7913 is AbstractSigner {
+    bytes private _signer;
+
+    constructor(bytes memory signer_) {
+        _setSigner(signer_);
+    }
+
+    /// @dev Return the ERC-7913 signer (i.e. `verifier || key`).
+    function signer() public view virtual returns (bytes memory) {
+        return _signer;
+    }
+
+    /// @dev Sets the signer (i.e. `verifier || key`) with an ERC-7913 formatted signer.
+    function _setSigner(bytes memory signer_) internal {
+        _signer = signer_;
+    }
+
+    /**
+     * @dev Verifies a signature using {SignatureChecker-isValidSignatureNow-bytes-bytes32-bytes-}
+     * with {signer}, `hash` and `signature`.
+     */
+    function _rawSignatureValidation(
+        bytes32 hash,
+        bytes calldata signature
+    ) internal view virtual override returns (bool) {
+        return SignatureChecker.isValidSignatureNow(signer(), hash, signature);
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/utils/cryptography/signers/SignerP256.sol

@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (utils/cryptography/signers/SignerP256.sol)
+
+pragma solidity ^0.8.20;
+
+import {AbstractSigner} from "./AbstractSigner.sol";
+import {P256} from "../P256.sol";
+
+/**
+ * @dev Implementation of {AbstractSigner} using xref:api:utils/cryptography#P256[P256] signatures.
+ *
+ * For {Account} usage, a {_setSigner} function is provided to set the {signer} public key.
+ * Doing so is easier for a factory, who is likely to use initializable clones of this contract.
+ *
+ * Example of usage:
+ *
+ * ```solidity
+ * contract MyAccountP256 is Account, SignerP256, Initializable {
+ *     function initialize(bytes32 qx, bytes32 qy) public initializer {
+ *       _setSigner(qx, qy);
+ *     }
+ * }
+ * ```
+ *
+ * IMPORTANT: Failing to call {_setSigner} either during construction (if used standalone)
+ * or during initialization (if used as a clone) may leave the signer either front-runnable or unusable.
+ */
+abstract contract SignerP256 is AbstractSigner {
+    bytes32 private _qx;
+    bytes32 private _qy;
+
+    error SignerP256InvalidPublicKey(bytes32 qx, bytes32 qy);
+
+    constructor(bytes32 qx, bytes32 qy) {
+        _setSigner(qx, qy);
+    }
+
+    /**
+     * @dev Sets the signer with a P256 public key. This function should be called during construction
+     * or through an initializer.
+     */
+    function _setSigner(bytes32 qx, bytes32 qy) internal {
+        if (!P256.isValidPublicKey(qx, qy)) revert SignerP256InvalidPublicKey(qx, qy);
+        _qx = qx;
+        _qy = qy;
+    }
+
+    /// @dev Return the signer's P256 public key.
+    function signer() public view virtual returns (bytes32 qx, bytes32 qy) {
+        return (_qx, _qy);
+    }
+
+    /// @inheritdoc AbstractSigner
+    function _rawSignatureValidation(
+        bytes32 hash,
+        bytes calldata signature
+    ) internal view virtual override returns (bool) {
+        if (signature.length < 0x40) return false;
+        bytes32 r = bytes32(signature[0x00:0x20]);
+        bytes32 s = bytes32(signature[0x20:0x40]);
+        (bytes32 qx, bytes32 qy) = signer();
+        return P256.verify(hash, r, s, qx, qy);
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/utils/cryptography/signers/SignerRSA.sol

@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (utils/cryptography/signers/SignerRSA.sol)
+
+pragma solidity ^0.8.20;
+
+import {AbstractSigner} from "./AbstractSigner.sol";
+import {RSA} from "../RSA.sol";
+
+/**
+ * @dev Implementation of {AbstractSigner} using xref:api:utils/cryptography#RSA[RSA] signatures.
+ *
+ * For {Account} usage, a {_setSigner} function is provided to set the {signer} public key.
+ * Doing so is easier for a factory, who is likely to use initializable clones of this contract.
+ *
+ * Example of usage:
+ *
+ * ```solidity
+ * contract MyAccountRSA is Account, SignerRSA, Initializable {
+ *     function initialize(bytes memory e, bytes memory n) public initializer {
+ *       _setSigner(e, n);
+ *     }
+ * }
+ * ```
+ *
+ * IMPORTANT: Failing to call {_setSigner} either during construction (if used standalone)
+ * or during initialization (if used as a clone) may leave the signer either front-runnable or unusable.
+ */
+abstract contract SignerRSA is AbstractSigner {
+    bytes private _e;
+    bytes private _n;
+
+    constructor(bytes memory e, bytes memory n) {
+        _setSigner(e, n);
+    }
+
+    /**
+     * @dev Sets the signer with a RSA public key. This function should be called during construction
+     * or through an initializer.
+     */
+    function _setSigner(bytes memory e, bytes memory n) internal {
+        _e = e;
+        _n = n;
+    }
+
+    /// @dev Return the signer's RSA public key.
+    function signer() public view virtual returns (bytes memory e, bytes memory n) {
+        return (_e, _n);
+    }
+
+    /**
+     * @dev See {AbstractSigner-_rawSignatureValidation}. Verifies a PKCSv1.5 signature by calling
+     * xref:api:utils/cryptography.adoc#RSA-pkcs1Sha256-bytes-bytes-bytes-bytes-[RSA.pkcs1Sha256].
+     *
+     * IMPORTANT: Following the RSASSA-PKCS1-V1_5-VERIFY procedure outlined in RFC8017 (section 8.2.2), the
+     * provided `hash` is used as the `M` (message) and rehashed using SHA256 according to EMSA-PKCS1-v1_5
+     * encoding as per section 9.2 (step 1) of the RFC.
+     */
+    function _rawSignatureValidation(
+        bytes32 hash,
+        bytes calldata signature
+    ) internal view virtual override returns (bool) {
+        (bytes memory e, bytes memory n) = signer();
+        return RSA.pkcs1Sha256(abi.encodePacked(hash), signature, e, n);
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/utils/cryptography/signers/draft-ERC7739.sol

@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (utils/cryptography/signers/draft-ERC7739.sol)
+
+pragma solidity ^0.8.20;
+
+import {AbstractSigner} from "./AbstractSigner.sol";
+import {EIP712} from "../EIP712.sol";
+import {ERC7739Utils} from "../draft-ERC7739Utils.sol";
+import {IERC1271} from "../../../interfaces/IERC1271.sol";
+import {MessageHashUtils} from "../MessageHashUtils.sol";
+import {ShortStrings} from "../../ShortStrings.sol";
+
+/**
+ * @dev Validates signatures wrapping the message hash in a nested EIP712 type. See {ERC7739Utils}.
+ *
+ * Linking the signature to the EIP-712 domain separator is a security measure to prevent signature replay across different
+ * EIP-712 domains (e.g. a single offchain owner of multiple contracts).
+ *
+ * This contract requires implementing the {_rawSignatureValidation} function, which passes the wrapped message hash,
+ * which may be either an typed data or a personal sign nested type.
+ *
+ * NOTE: xref:api:utils/cryptography#EIP712[EIP-712] uses xref:api:utils/cryptography#ShortStrings[ShortStrings] to
+ * optimize gas costs for short strings (up to 31 characters). Consider that strings longer than that will use storage,
+ * which may limit the ability of the signer to be used within the ERC-4337 validation phase (due to
+ * https://eips.ethereum.org/EIPS/eip-7562#storage-rules[ERC-7562 storage access rules]).
+ */
+abstract contract ERC7739 is AbstractSigner, EIP712, IERC1271 {
+    using ERC7739Utils for *;
+    using MessageHashUtils for bytes32;
+
+    /**
+     * @dev Attempts validating the signature in a nested EIP-712 type.
+     *
+     * A nested EIP-712 type might be presented in 2 different ways:
+     *
+     * - As a nested EIP-712 typed data
+     * - As a _personal_ signature (an EIP-712 mimic of the `eth_personalSign` for a smart contract)
+     */
+    function isValidSignature(bytes32 hash, bytes calldata signature) public view virtual returns (bytes4 result) {
+        // For the hash `0x7739773977397739773977397739773977397739773977397739773977397739` and an empty signature,
+        // we return the magic value `0x77390001` as it's assumed impossible to find a preimage for it that can be used
+        // maliciously. Useful for simulation purposes and to validate whether the contract supports ERC-7739.
+        return
+            (_isValidNestedTypedDataSignature(hash, signature) || _isValidNestedPersonalSignSignature(hash, signature))
+                ? IERC1271.isValidSignature.selector
+                : (hash == 0x7739773977397739773977397739773977397739773977397739773977397739 && signature.length == 0)
+                    ? bytes4(0x77390001)
+                    : bytes4(0xffffffff);
+    }
+
+    /**
+     * @dev Nested personal signature verification.
+     */
+    function _isValidNestedPersonalSignSignature(bytes32 hash, bytes calldata signature) private view returns (bool) {
+        return _rawSignatureValidation(_domainSeparatorV4().toTypedDataHash(hash.personalSignStructHash()), signature);
+    }
+
+    /**
+     * @dev Nested EIP-712 typed data verification.
+     */
+    function _isValidNestedTypedDataSignature(
+        bytes32 hash,
+        bytes calldata encodedSignature
+    ) private view returns (bool) {
+        // decode signature
+        (
+            bytes calldata signature,
+            bytes32 appSeparator,
+            bytes32 contentsHash,
+            string calldata contentsDescr
+        ) = encodedSignature.decodeTypedDataSig();
+
+        (
+            ,
+            string memory name,
+            string memory version,
+            uint256 chainId,
+            address verifyingContract,
+            bytes32 salt,
+
+        ) = eip712Domain();
+
+        // Check that contentHash and separator are correct
+        // Rebuild nested hash
+        return
+            hash == appSeparator.toTypedDataHash(contentsHash) &&
+            bytes(contentsDescr).length != 0 &&
+            _rawSignatureValidation(
+                appSeparator.toTypedDataHash(
+                    ERC7739Utils.typedDataSignStructHash(
+                        contentsDescr,
+                        contentsHash,
+                        abi.encode(keccak256(bytes(name)), keccak256(bytes(version)), chainId, verifyingContract, salt)
+                    )
+                ),
+                signature
+            );
+    }
+}