Sanity check address/key usability

[AdamISZ]

Having recently been pointed at this, it makes me think that there is value in the following:

At the moment that Joinmarket creates a new address for deposit (including change), it could/should do a sanity check sign and verify operation to ensure that the created address (and not only pubkey) matches what the algorithms expect.

This would be an attempt to defend against the possibility of a low level hardware failure (e.g. bitflip) that results in the creation of an address/scriptPubKey that can't be solved, i.e. can't be spent from.

There's probably several details needed to refine/expand on the above.

[kristapsk]

Concept ACK. Had similar ideas in my mind when read about this LND issue.