According to CoinMeta, as reported by an early issuer of in, Mysten Labs co-founder and chief cryptographer Kostas Chalkias is developing a quantum-resistant hardware wallet card that will cost less than $10. This card has a quantum signature time of 1-2 seconds. Kostas Chalkias plans to sponsor the cards for users who cannot afford them, and the project is built on top of the SUI protocol layer. It is also planned to add two post-quantum signature schemes approved by NIST. Existing SUI accounts will be able to switch to quantum-resistant keys using their current mnemonic phrases.