Second @second.tech · 2d 4/ Because the onion is built by the client, the gateway is blinded to what's inside it. The destination, the full route, the hop count, and the precise amount live only inside the onion. The gateway turns into a dumb onion relay: it just ships what your Bark wallet hands it.
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5/ If they're building their own route, wallet apps will also require a gossip map. This is where another LDK feature comes in: the Rapid Gossip Sync server. This serves compact snapshots on-demand, with delta updates that cut sync time to a handful of milliseconds.