Make it more convenient the "one-time send data to another person" scenario

[MihanEntalpo]

Maybe make it possible to generate a link to add a key immediately with some special parameter indicating that specific data is expected, so that when a person adds a key using such a link, a message "ready to accept a password from you" is automatically sent.
This kind of message would probably need to be signed with a hash, and in order to prove it to be true, the hash would have to be sent back when the request was received.

Then the script will be like this:

1. Send a link to a person
2. From the person comes the message "ready to accept the password"
3. We send the password.

There are also disadvantages: if the message is intercepted, then there is no way to know who exactly is ready to accept the password.

Need further research