You’re getting a negative reaction from others but I share this feedback in good faith: I don’t understand what problem your product is supposed to solve.

Yeah I guess the cryptographic stuff sounds vaguely impressive although it’s been a long time since I had to think about cryptography in detail. But what is this _for_? I’m going to buy an expensive keyboard so that I can send messages to someone and they’ll know it’s really me – but it has to be someone who a) doesn’t trust me or any of our existing communication channels and b) cares enough to verify using this weird software? Oh and it’s important they know I sent it from a particular device out of the many I could be using?

Who is that person? What would I be sending them? What is the scenario where we would both need this?

Also the server can’t read the message but the decryption key is in the URL? So anyone with the URL can still read it? Then why even bother encrypting it?

Maybe this is one of those cases where I’m so far outside your target market that it was never supposed to make sense to me but I feel like I’m missing something here. Or maybe you need to work on your elevator pitch.

Just sharing my honest reaction.