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You can compile the firmware yourself instead of downloading it already compiled. The code for cold card firmware lives here
Alternatively you can purchase multiple devices from different manufacturers and create a multisig wallet that requires multiple signatures from multiple devices. Wallet software like Specter-Desktop can help you with this. They also have a DIY signer https://github.com/cryptoadvance/specter-diy
Alternatively you can purchase multiple devices from different manufacturers and create a multisig wallet that requires multiple signatures from multiple devices. Wallet software like Specter-Desktop can help you with this. They also have a DIY signer https://github.com/cryptoadvance/specter-diy
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