Why not a confirmation phrase of a few words? This should be easier to 
implement and fit into a pre-existing design programme. Given a pool of enough 
words this would surely be as reliable as an identicon, no?

Best regards,
Max

On 29 Dec 2018, 17:23 +0100, William Casarin <j...@jb55.com>, wrote:
> Pavol Rusnak via Lightning-dev <lightning-dev@lists.linuxfoundation.org
> writes:
>
> > Hi all!
> >
> > Currently, when I perform a payment via QR code, I usually check the
> > payee node id (public key) in the send dialog. However, this is a rather
> > long hex value, so for example Eclair app shows just the beginning and
> > the end of the value.
> >
> > Idea: Can we show an identicon (for example https://jdenticon.com/) of
> > payee node id (= public key) next to the QR code, so user can visually
> > quickly check whether the recipient is correct?
>
> I think it would be interesting if someone came up with a visual hashing
> algorithm, where small changes in the inputs had uniformly random visual
> outputs. I was testing jdenticon with my node id:
>
> 03f3c108ccd536b8526841f0a5c58212bb9e6584a1eb493080e7c1cc34f82dad71
>
> I was surprised to see that small changes to the first digit didn't
> change the visual output at all. Whether or not this is a useful
> property in this use case, it's something to keep in mind.
>
> Cheers,
> Will
>
> --
> https://jb55.com
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