Architecture and status verified against the ZKas node and wallet source, re-checked 1 October 2026. Kaspa-side opcode gram costs, the OpChainblockSeqCommit window and the KIP-21 leaf layout are taken from the Toccata specification and were not re-read from source: re-check them before building. Multi-party atomic bundles landed on main on 1 October 2026 behind a default-off flag: unreleased, and not yet proven end to end against a live node, so every card resting on them is rated as unbuilt. Ratings are directional estimates. The same map appears in the developer docs.