[TheAdamAndChe]

While this may be cryptographically sound(I haven't looked into it), it's not a viable solution since it won't be trusted or understood by the majority of their target demographic.

[angrais]

Surely it depends how they would frame it? I'd imagine they wouldn't lead with "Cryptographically secure with BitCoin .."

[conanbatt]

An auditable system doesn't need everyone to do the audit: you want it for anyone to be able to audit, and for some to do it.

It's also very easy to provide the auditing tool. (I did it, long ago. Basically a form.)