Offline Wallet Grant. 30,000 grin

[satoshocrat]

Probably a good time to bump/remind of this:

Grin Bulletin Board: Discussing three options and select one for bounty

In the Community Council meeting of today we discussed the possibility of introducing a Bulletin Board system for Grin as sugested by @satoshocrat. The purpose of a Bulleting board is for users to be able to share information while they are offline. These are not non interactive transactions, but are a solution that allows those users who do not like having their wallet online, or those who do not like to share their slatepacks via email or other known channels, to share that information. The o…