A new report from BNB Chain Research underscores the challenges blockchain networks face in transitioning to post-quantum security. The study reveals that the primary hurdle is not the consensus systems but the substantial increase in transaction and block sizes due to quantum-resistant signatures. Current blockchain transactions are relatively small, but adopting ML-DSA-44 signatures could increase transaction sizes from 110 bytes to 2.5 KB, and block sizes from 130 KB to nearly 2 MB. This increase in data size significantly impacts network performance, with throughput decreasing by 40% to 50% due to longer propagation times. Despite pqSTARK compression technology reducing validator signature data by 43 times, the network struggles with transmitting larger data volumes. The report emphasizes that while quantum computers currently pose no immediate threat, significant infrastructure upgrades will be necessary for blockchains to handle post-quantum cryptography demands effectively.