Circle Research warns that quantum computing could compromise blockchain security by 2030, necessitating a shift to post-quantum cryptographic protocols. Current systems using ECDSA and RSA are vulnerable to quantum attacks, prompting developers to test post-quantum TLS, validator signatures, and larger keys. U.S. and EU regulators are pushing for these upgrades to be implemented within the next decade. To secure networks, major providers like Google and AWS are adopting post-quantum TLS protocols. Proof-of-Stake blockchains, such as Ethereum, are exploring new signature schemes to protect validators. Wallets and addresses must migrate to post-quantum systems before "Q-Day" to avoid exposure, with significant changes required across networks. Zero-knowledge systems also need to upgrade to maintain security against potential quantum threats.