Cross-Domain Coordination Handoff

Mechanism

A cross-domain handoff is composed from four structural elements. First, a source-domain coordination state — the set of obligations, holdings, and conditions in effect within the relinquishing domain at the moment of transfer. Second, a source-domain credential chain — the signed lineage establishing the relinquishing authority's standing to release the coordination. Third, a target-domain admissibility evaluation — a structured determination, executed against the receiving domain's governance rules, that the incoming state is admissible under target-domain credentials. Fourth, a dual signature binding the transfer: the source authority signs to confirm relinquishment, and the target authority signs to confirm acceptance, producing a single handoff record that enters lineage in both domains.

The cross-domain mapping itself is governance-credentialed. A mapping authority — typically a coordinating body recognized by both domains, or a bilateral agreement instrument — signs the rules that translate source-domain coordination structures into target-domain admissibility expressions. Participating domains admit the mapping into their own governance roots, after which handoffs proceed within the mapping framework without per-event renegotiation. The mapping is itself a lineage-bound artifact: amendments flow through the same credentialed-update procedures that govern any other rule of admissibility, and amendment events are themselves admissible only when signed by the mapping authority and acknowledged by both participating domains within their respective governance windows.

When a handoff executes, the protocol writes the source-state snapshot, the credential chain, the admissibility evaluation, and the dual signatures into a record that both domains retain. Downstream coordination in the receiving domain references the handoff record as the predecessor lineage element; later audit can follow the chain backward across the domain boundary without losing structural continuity. The handoff record is also the only structurally recognized artifact of the transfer: side-channel acknowledgments, courtesy notifications, and informal confirmations between the two authorities are not lineage-bearing and have no admissibility weight in either domain.

A reciprocal property of the mechanism is non-repudiation in both directions. The source authority cannot later deny that it relinquished the coordination, because its signature is bound to the handoff record retained by the target. The target authority cannot later deny that it accepted the coordination, because its signature is bound to the same record retained by the source. Symmetry of retention — both domains hold the full record — eliminates the failure mode in which one party retains the record and the other does not, which is endemic to bill-of-lading and email-receipt handoffs in conventional logistics. Either domain alone can produce the record on demand, and any verifier presented with the record can re-execute the admissibility evaluation against the recorded mapping version to confirm that the transfer was valid under the rules in force at the time.

Operating Parameters

The disclosure parameterizes the handoff over several dimensions. The relinquishment scope is selectable: a handoff may transfer the entire coordination state, a partitioned subset (for instance, only the cargo-custody portion of a multimodal shipment while routing authority remains with the source), or a conditional subset whose effective transfer depends on receiving-domain acknowledgments. The admissibility evaluation can run in synchronous mode — the receiving authority signs only after evaluation completes — or in deferred mode, where preliminary admission is granted and a follow-on reconciliation closes the record after target-domain consistency checks complete.

Mapping rules are versioned. Each handoff records the mapping version in effect at the moment of transfer, so subsequent amendments to the mapping do not invalidate prior handoffs and prior handoffs cannot be retroactively reinterpreted under new rules. Signature parameters — key types, threshold requirements where multi-party authorities operate, hash algorithms — are governance-declared per domain pair; the protocol carries the parameters in the handoff envelope so that verifiers in either domain can reconstruct the verification context without out-of-band coordination.

A timing parameter governs the maximum interval between source signature and target acceptance: the source's relinquishment is presumed standing for a declared window, after which it expires and a re-issuance is required. A liveness parameter requires periodic re-affirmation by the target authority during the deferred-admission window, ensuring that a target cannot accept admission preliminarily and then disengage without producing a closeout signature. A revocation-parameter declares the conditions under which either domain may unilaterally void an in-flight handoff before the dual signature completes — typically tied to discovery of a credential compromise, a mapping defect, or an out-of-spec source-state snapshot — and binds the void event itself into both domains' lineage.

A jurisdictional-overlay parameter permits handoffs to inherit additional governance constraints when the source and target domains span legal jurisdictions. The overlay declares which jurisdiction's substantive rules govern interpretation of the transferred state, which jurisdiction's evidentiary rules govern admissibility of the handoff record in dispute proceedings, and which jurisdiction's revocation procedures may unwind the transfer. Overlays are themselves lineage-bound artifacts signed by jurisdictional authorities; participating domains accept overlays into their governance roots in the same way they accept mappings, and a single handoff may operate under one mapping and zero or more overlays simultaneously.

Alternative Embodiments

The cross-domain handoff primitive admits several embodiments. In the bilateral form, two domains share a direct mapping and execute handoffs as point-to-point transfers. In the hub form, multiple domains map to a coordinating intermediary (a port community system, a regulator-operated clearinghouse, a defense-civil liaison authority) that mediates the handoff and retains the canonical record. In the chained form, an activity passes through a sequence of domains — origin shipper, originating carrier, transshipment terminal, receiving carrier, destination consignee — with each segment producing its own handoff record and the full chain reconstructible from the linked lineage.

Alternative embodiments also vary the credential model. A handoff may use direct signatures from the principal authorities in each domain, delegated signatures from agents holding scoped authority, or threshold signatures aggregating multiple required signers within either or both domains. The disclosure further admits embodiments in which the admissibility evaluation runs against attested computation rather than against direct authority signature — useful where neither domain wishes to expose internal admissibility logic but both accept a common attestation framework.

In an emergency embodiment, expedited handoff procedures admit truncated admissibility evaluation under declared emergency conditions — for example, mass-casualty medical evacuation across jurisdiction boundaries, or wartime defense-civil custody transfers — with the full evaluation deferred to post-event reconciliation. Emergency handoffs carry an explicit emergency credential signed by an authority recognized by both domains, and the resulting record is flagged as emergency-expedited so that downstream audit applies the appropriate evaluation standard. In a long-running embodiment, the handoff is not instantaneous but extends over an explicitly bounded transition period during which both authorities co-sign incremental state updates; the transition closes with a final dual-signature confirming complete transfer, and intermediate state during the transition is jointly attributable to both domains.

Composition

Cross-domain handoff composes with the other coordination primitives of the disclosed mesh. With role differentiation, a handoff can carry role assignments across the boundary: a unit holding a particular role in the source domain receives an equivalent or mapped role in the target domain through the same handoff event. With partial-quorum coordination, a handoff can execute even when a subset of the source domain is unreachable, provided the quorum requirements declared in the source-domain governance are met by the participating signers. With dynamic membership, the handoff envelope can reference membership snapshots at the moment of transfer, ensuring that later membership changes in either domain do not retroactively alter the validity of the recorded handoff.

The primitive also composes with cascade-propagation analysis and cross-mesh reconciliation. A cascade event detected during a handoff can trigger upstream coordination in either domain; a handoff that crosses mesh boundaries in addition to domain boundaries can run within the reconciliation framework so that both the domain transition and the mesh transition are recorded as a single composite event with continuous lineage.

Composition with the matched-pair settlement primitive enables handoffs to be paired with bilateral economic settlement: the same envelope that records the relinquishment and acceptance can carry the agreed consideration — payment, indemnification, surety — and the resulting record functions both as a custody-transfer artifact and as a settled commercial transaction. Composition with the no-consensus-settlement primitive captures handoffs that fail: when a target authority declines to accept under the declared mapping, a structured non-handoff record is produced that captures the declined state, the basis for declination, and the resulting disposition (return-to-source, escalation, alternative-target routing). Composition with the disclosed audit primitive permits a third-party auditor — a regulator, an insurer, a procurement officer — to subscribe to handoff events at a credentialed boundary and to receive the resulting records under terms negotiated with both participating domains, without altering the structure of the handoff itself.

Prior-Art Distinction

Prior-art cross-domain transfers typically take one of three forms: paper or electronic bills of lading exchanged between carriers, point-to-point integrations between domain-specific systems, or governance-by-platform models in which a single platform owner mediates all transfers. None of these produces a credentialed, dual-signed, lineage-bound handoff record that is independently verifiable in both domains. Bills of lading lack admissibility evaluation against the receiving domain's governance rules; point-to-point integrations lack governance-credentialed mappings and version discipline; platform-mediated models concentrate trust in the platform operator rather than distributing verification across the domains themselves. The disclosed handoff primitive distinguishes itself by its structural design: dual authority, credentialed mapping, dual lineage, and version-bound parameters yielding handoff records whose continuity does not depend on the ongoing operation of any intermediary.

Prior-art interoperability frameworks — EDI standards in logistics, HL7 in medical exchange, mutual-aid agreements in defense-civil interfaces — define data shapes and message exchanges but do not bind the resulting records into a credentialed lineage that survives the transfer. A bill of lading transferred under EDI is a data-shape conformance event, not a governance-credentialed admissibility event; the receiving party may store the data and process it internally, but neither party can later prove that the transfer was admissible under a specific versioned mapping signed by an authority both recognized. The disclosed primitive's dual-lineage retention, mapping versioning, and admissibility evaluation are absent from these frameworks not by oversight but because the frameworks predate the credentialing infrastructure that makes such guarantees implementable. The primitive thereby occupies a layer above conventional interoperability standards: it can run on top of EDI, HL7, or mutual-aid messaging by treating those as transport, while supplying the credentialed-record semantics that none of them provides natively.

Disclosure Scope

The provisional discloses cross-domain handoff as a primitive applicable wherever operational authority transfers across a credentialed boundary. The disclosure expressly contemplates intermodal logistics (truck-to-rail, rail-to-vessel, vessel-to-terminal), defense-civil interfaces (mutual aid, evacuation, civil-support handoffs), regulator-operator transitions (commissioning, decommissioning, custody transfer), vendor-to-operator handoffs (delivery acceptance, warranty boundaries, operational cutover), and jurisdiction-to-jurisdiction transfers (cross-border cargo, multi-jurisdictional emergency response, international medical evacuation). Domain enumeration is non-limiting: the primitive applies to any pair of governance-credentialed domains willing to sign a mapping and to admit the resulting handoff records into their respective lineage chains. New domains emerging through operational specialization integrate by declaring mappings to existing domains; existing operations continue under their original mappings without disturbance.

The recitation extends to the apparatus components that implement the primitive: the mapping-authority instruments that sign and version the cross-domain rule sets, the protocol envelopes that carry source-state snapshots and credential chains across the boundary, the admissibility-evaluation engines that execute the receiving domain's governance rules against the incoming state, and the dual-lineage retention systems that bind the resulting record into both domains' coordination histories. The recitation is non-limiting as to transport: the handoff record may be exchanged over any reliable channel, including conventional networking, store-and-forward messaging, or physical media transfer, provided the resulting record is identical in both domains and bears valid signatures from both authorities. The recitation is also non-limiting as to subject matter: any coordinated activity whose continuity the participating domains wish to preserve across the boundary — physical custody, fiscal responsibility, operational authority, regulatory standing, or composite combinations thereof — falls within the disclosed primitive.