smom-dbis-138/contracts/mainnet-checkpoint/extensions/CheckpointExtensionBase.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import {ICheckpointExtension} from "../interfaces/ICheckpointExtension.sol";
import {CheckpointStorage} from "../storage/CheckpointStorage.sol";
import {CheckpointLeaf} from "../libraries/CheckpointLeaf.sol";

/// @notice Default no-op verifyLeaf; override in modules that need custom proofs.
abstract contract CheckpointExtensionBase is ICheckpointExtension {
    function HOOK_VERIFY_LEAF() external pure virtual returns (uint32) {
        return 0;
    }

    function verifyLeaf(
        CheckpointStorage.CheckpointHeader calldata,
        CheckpointLeaf.PaymentLeafV1 calldata,
        bytes32[] calldata
    ) external pure virtual returns (bool) {
        return false;
    }
}