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Yehuda Lindell, Chief Cryptologist at Coinbase, stated that Coinbase is designing a custody system that can adapt to any post quantum signature scheme that Bitcoin may adopt in the future. Coinbase is researching a backup architecture centered around programmable hardware security modules (HSMs), where private keys will be encrypted using quantum cryptography and assembled only within physically secure HSMs. This system aims to support any post quantum signature scheme to cope with future Bitcoin technology upgrades.