Rail A · hash-based Merkle
QRL Merkle evidence
QRL is a public ledger whose account signatures are hash-based (XMSS today; hash-based families are the conservative PQ bet). AEGIS-Q treats QRL as the Merkle rail: each evidence pack is a leaf; operators receive an inclusion path against a published root. That witness does not share a lattice assumption with Rail B.
Hash-based signatures are large and stateful or carefully instantiated. We do not pretend they are cheap. We pretend they are a different problem than lattices.