It’s all about encrypted email messages. They’re talking about using a blockchain as a universal public key directory. I assume PM is doing this internally alre

It’s all about encrypted email messages. They’re talking about using a blockchain as a universal public key directory. I assume PM is doing this internally already since they already know the public keys on their own hosted accounts, but that’s not the case when PM exchanges email outside their own service/domain. A big challenge I don’t see addresses or discussed in the article is how blocks would be created and added to the chain if it’s going to be made public (and therefore useful outside of PM’s internal systems/email).