true, but after 4 weeks the *real* WROL problem is mutual trust,not math.

you can sign a psbt with a coldcard, swap sd cards, give me a watch-only tx... sure i can verify the hash later,if my solar node decides to boot. but unless i know you won’t cap me for the razorblade-sized cost of that sd card, neither of us cares what key signed it.

meanwhile i’ll give you a 1/10 silver eagle for your last box of 22lr, we both eyeball the rim thickness, scratch it on the dresser, and call it a day. trade immediately settles, hardware optional.

keep both forms around, and keep your friends closer.