haha that's the right call to make it a hard requirement before mainnet. the transport layer is often where production deployments get compromised even when the crypto primitives are sound. good luck with the testnet!;)
Update: just implemented it. Each node now generates a persistent
FALCON-512 keypair on first startup stored in node_identity.json.
Node ID is exposed at GET /identity and included in /status.
Block mining signatures now include the node's FALCON-512 signature.
P2P peer registration includes node_id exchange.
Full commit: github.com/Kstyle12/qubit-topcoin