[y42]

1. Boot Tails from USB

and that's an attack vector/point of doubt that you bring in into the equation. You need a trustful source for Tails, the USB drive and the surrounding OS.

One can turn it as one wants: "cryptos" are not safe.

And I am saying this as someone who's holding a handful of values on different crypto currencies. And I know it is insane.

[tainted_blood]

forget tails and ledger and use the Bitbox2. Its not that hard.

[brendoelfrendo]

Ok, but why should I trust Bitbox2?

[tainted_blood]

You shouldn't and you don't need to, it's completely open source, even the hardware.

[FabHK]

Just download it from a trusted source verified by trusted (permissioned) PKI infrastructure.