[lehnberg]

> This would mean that you could only send grin to people how are online. Is this correct?

No. interactive != online. You can exchange information over any comms method, i.e. email, carrier pigeon, message in a bottle, or... Grinbox: A a federated transaction relay specifically designed to facilitate grin transaction building. It supports asynchronous message delivery. (Disclosure: I'm part of the team building it.)

Best way to try it out in action is via https://github.com/vault713/wallet713

An update on what else we're up to https://medium.com/vault713/hello-from-vault713-6f7b01d9abec