DART
The "Distributed Archive of Random Transactions" is the consensus database used by tagion. It stores HiBON documents in a key value fashion. Where the key is a dartindex Each node continuesly updates their copy of the database as consensus is reached.
Internally it is represented as a 'sparse-merkle-tree'. This allows efficiently calculating the consensus state of the database (bullseye).
And makes synchronization with new nodes trivial.