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I would avoid something like a RPI just because it has an entire OS as a threat surface. I would try a signing wallet but I also say. Play around with small amounts. There are a lot of ways to secure bitcoin and the more you have experience with the better
You don't install the raspberry pi OS to make a hardware wallet with the pi zero. If you use seedsigner, its just loading seed signers software... Same with pitrezor. There is no pi OS installed.
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It's act like actual device yes it's no need any os memory card and file!
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We see most of the times hardware wallet getting hacked because every company use cheap microcontroller and it's always available exploits because update not available from manufacturer or development slow or stop!
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Physical access will always be the weak point of any hardware wallet.
If it leaves your sight, assume it's compromised and sweep to a new wallet.
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If someone DIY hardware wallet first create a Veracrypt container secure put wallet all files in it unlocked use then lock super secure!
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With raspberry pi!
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