The public API and SPI: the Space interface and template DSL, leases, entry records, the advertisement family, and the extension points implementations plug into. Applications program against this module; implementation modules stay swappable.

The open connector SDK behind the AssetCard model (ENTERPRISE §6, COMPETITIVE §7 boundary: the SPI and protocol stay Apache 2 so anyone can build a connector; the finished enterprise connectors and the console are the commercial layer). ...

The QUIC (RFC 9000) binding of the Transport SPI (spec §5.5): length-prefixed frames over one bidirectional QUIC stream per peer connection, on Netty's incubator QUIC codec (quiche). Peers gain transport-level encryption, loss recovery, ...