A report by cryptocurrency exchange, Coinbase, has warned that proof-of-stake blockchains like Ethereum, Solana, could face greater exposure to future quantum computing attacks due to their validator signatures that a powerful enough quantum computer could eventually break. The report was released by the Independent Advisory Board on Quantum Computing and Blockchain, which includes academics from Stanford University, the University of Texas at Austin, the Ethereum Foundation, Eigen Labs, Bar-Ilan University, and the California, California, University of California, Santa Barbara. It also identified digital signatures used by crypto wallets as another major long-term vulnerability, which could allow attackers to impersonate wallet owners and move their funds. While the report stated that current cryptocurrency systems remain secure, as quantum computers capable of breaking modern cryptographic signatures do not yet exist exist. The move to quantum-resistant cryptography presents technical challenges due to larger quantum-safe signatures significantly larger than current ones, potentially affecting transaction speed, storage, and costs.