Air Gapped Cold Storage without Buying from a Specific Company

Offline bitcoin signing by 402 payment required
https://youtu.be/-tLoiLo5fT8?t=115

Use case: You want to self-custody and might be worried about viruses on your computer stealing funds, but spending money on a signing device and waiting for it to arrive is not something you prefer to do. This means not having benefits like a secure element, duress pin, and it is also more technical, but you don't have time to wait and need this done now and have hardware lying around.

As always check: https://glacierprotocol.org/ for more security recommendations if you would like to go a step further.

Separate but useful video on check software signatures: https://www.youtube.com/watch?v=vX3egv7HXeo