We have achieved to decouple the wallet core logic from its backend target and only support one target at the moment: cardano-http-bridge. Time has come to extend this to a new target: Jörmungandr. In this milestone, we'll start by implementing various primitives needed to comprehend new address and block formats used by Jörmungandr as well as, re-implementing a new network layer using the REST API provided by the node.