Messages, will be checked / earmarked as 'processed' by the chain software? In the end one of the validators is processing the message and executes the code right to store it in the db. What happens if a physical server in the middle of the execution quits because of power failure?
Will messages get a lifetime? Doubles(p)ent messages :) will there be unexecuted messages floating around on chain? Are you the messenger?
Lastly, are you know working on hypothetical apps and building the source afterwards or is the source, specifically for the eos part, already ready?
See you in nyc!
Messages are like Steem and BitShares transactions. A power failure would simply require replaying from the last good snapshot of the state.