whereaboutsnow
Your contacts on a bigger screen, for as long as this tab is open.
Your phone does the decrypting, the same as it always does, and passes the result to this tab for as long as you leave it open. The tab holds nothing: no pairing, no contacts, no keys that outlive it.
Your phone has to be on, unlocked and online. If it is not, there is no viewer. That is the design rather than a fault: this tab cannot decrypt anything on its own and will not be given the means to.
Session
Your phone needs this key.
It was made in this tab a moment ago and it is used once. It is useless to anyone else, and it will not exist after you close this page. This build shows it as text rather than as a code to scan, because the layout for a scannable one has not been published yet.
Session key, this tab only
Read it into your phone if it cannot scan. It is a public key: it says who to answer, never what to say.
This build cannot finish the handshake
That session has ended.
The key this tab made has been overwritten. Starting again makes a new one, and your phone will ask you about it again.