Wait, have you actually used Signal multi-device?  Your thesis is that it&#x27;s not usable because you have to scan a QR code once, as opposed to Telegram where you have to receive an SMS on your device and manually type it in on your desktop?<p>The flow you&#x27;re describing in your &quot;possible solution&quot; is basically identical to how Signal works now: you install Signal on a new device, approve it with your existing device, and are done. Anything involving the word &quot;blockchain&quot; here is fundamentally not going to work.  It sounds like you want CONIKS, but there are some really substantial barriers to deploying that for marginal gains (and some clear losses).