He specifically mentioned concerns around hypothetical scenarios where rule checking, such as validating the 64 bytes size for all block transactions, might become a point of vulnerability. To illustrate his point, Antoine referenced the validation logic found in libbitcoin's block::check() function, highlighting it as the equivalent of core's CheckBlock process. The function in question is detailed within the libbitcoin system's repository, accessible at https://github.com/libbitcoin/libbitcoin-system/blob/master/src/chain/block.cppL751. Antoine's communication underscores a keen interest in understanding how memory and CPU DoS vulnerabilities can be mitigated through effective memory management practices and robust pointer usage in programming.