Jehan Tremback from Informal released a post yesterday titled “Atomic IBC”. https://informal.systems/blog/atomic-ibc. In essence, atomic IBC is taking replicated security and extending it one step further by having consumer chains not only share security from the hub, but share a mempool and blocks as well. Each chain would maintain its own separate state machine but be allowed to share blocks with other consumer chains when desired.

Replicated security was essentially the parallelization of applications through separate chains; atomic IBC keeps this property while adding the ability to have these chains commit to blocks atomically when desired.

This implementation can pave the way towards the Hub competing in the shared sequencing market while at the same time reducing replicated security costs and creating a single efficient MEV market for the AEZ (Atom economic zone). I’d recommend reading the entire post if interested.