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Voltis Sig utilizes a two-of-three signature scheme, where users can authorize transactions using any two out of three devices. In the setup demonstrated, the user employs a computer, an Android phone, and an iPhone to create a Secure Vault. This feature mirrors conventional hardware wallets, such as Ledger, which require physical devices to approve transactions. However, Voltis Sig capitalizes on the devices users already own, streamlining the process.