Mysten Labs co-founder and chief cryptographer Kostas Chalkias said he has leased a dedicated factory at a secret location to mass-produce quantum-safe hardware wallet cards for Sui. The aim is to bring the key cost for each card below $10, with NFC (near-field communication) quantum signing taking 1 to 2 seconds. Chalkias said he is advancing the effort in his personal time outside work and may subsidize cards for users who cannot afford them. The push comes partly after a recent Coldcard hardware wallet incident, though the disclosed flaw was not a quantum attack. Coinkite said a firmware vulnerability dating back to a 2021 update bypassed the hardware random number chip and generated keys through a predictable software process tied to data including the device serial number. Attackers have moved funds since July 30, with losses reaching about 2,055 BTC across more than 7,700 addresses, worth nearly $130 million. Separately, Sui plans to add two NIST (U.S. standards body) approved post-quantum signature schemes at the protocol level, one for everyday accounts and another for high-value Move vaults. Existing accounts would be able to rotate to quantum-safe keys using the original recovery phrase without migrating to a new wallet, according to Bitcoin.com News.