QUIC is the primary consensus transport: a UDP-based, TLS-secured libp2p transport with native stream multiplexing.
Consensus clients MUST support the QUIC (UDP) libp2p transport for both dialing and listening on IPv4 and IPv6. When a peer is reachable over both QUIC and TCP, clients SHOULD prioritise the peer's QUIC addresses.
QUIC is secured using TLS 1.3, configured according to the libp2p TLS
specification. Because QUIC multiplexes natively, the stream multiplexer is
omitted for QUIC connections. Consensus ENRs announce the local QUIC listener
under the quic and quic6 keys.
The libp2p QUIC specification defines the transport profile; the libp2p stack page states the consensus profile around it.