Nic Carter, co-founder of Castle Island Ventures, has raised concerns about the vulnerability of 1.7 million BTC in abandoned addresses due to advancements in quantum computing. On December 20, Carter highlighted research by Scott Aaronson, emphasizing that quantum threats have transitioned from theoretical to engineering challenges. He urged the cryptocurrency community to prioritize post-quantum upgrades, which he estimates could take nearly a decade to implement. Carter's warning comes amid growing security concerns among Bitcoin holders, with questions about the safety of platforms like KuCoin becoming increasingly relevant. As the potential threat from quantum computing looms, ensuring the security of BTC holdings remains a critical issue for traders.