Multibranch: not written data handling
Data comes to the nodes without being immediately written, and waits a block to be considered validated. This data could be named "eligible" and is the set of:
- identities
- certifications
- memberships
- transactions
With multibranch mechanism, uCoin should:
- propagates eligible data to the lowest core of each branch (potentially the shared root core)
- when a core is being destroyed be election, it should propagates its eligible data to root core