>     It's non trivial.

>     Key distribution is the hard part, because of MITM attack.

>     Decentralized approach:  Web of trust works but is hard to use and
>     therefore hard to bootstrap. (Why no one uses pgp, and even fewer
>     people use WOT).

>     https://keybase.io/ is sort of half decentralized hybrid for pgp key
>     distribution.

>     If you're ok with centralized there are many approaches, but then you
>     have single point of failure.

>     Other interesting things to google/link:

>     bitid
>     http://bitcoinism.blogspot.com/2013/09/building-pgp-web-of-trust-that-people.html

>     various approaches to token authentication for kyc/aml using crypto
>     currencies (mastercoin/counterparty discussions)

>     truthcoin

>     On Wed, May 28, 2014 at 9:11 AM, Mats-Erik Pistol
>     <meapistol@??? <mailto:meapistol@gmail.com>> wrote:
>     > Dear all,
>     >
>     > There are many applications that need a reputation system.
>     > Would it not be handy to have a reputation server, probably
>     connected with a
>     > public key server?
>     > Maybe this has been thought of before but I have not really read
>     about it.

>     >
>     > --
>     > Cheers,
>     > Mats-Erik

>     >
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>     > https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/unsystem

>     >
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> -- 
> Alex Kravets <http://www.linkedin.com/in/akravets>       def redPill =
> 'Scala <http://www.scala-lang.org/>
> [[ brutal honesty <http://goo.gl/vwydt> is the best policy ]]