Role-Differentiated Multi-Party Attestation

Mechanism

The mechanism comprises four cooperating components: a signed role taxonomy, a role-declaration step at coordination initiation, a role-specific admissibility check, and a composite-admissibility weighting function that combines role-tagged attestations into the final coordination outcome. The role taxonomy is itself a credentialed artifact: the set of admissible roles, the evidentiary standards bound to each role, and the cryptographic identifier of the issuing taxonomy authority are signed and distributed so that every participant validates the same role definitions. A taxonomy update that introduces a new role, retires an obsolete role, or revises the evidentiary standard bound to an existing role produces a new signed taxonomy version that propagates through the same admissibility channel as any other credentialed primitive.

At coordination initiation each prospective participant presents (i) its credentialed identity, (ii) the role under which it intends to attest, and (iii) the taxonomy version against which the role is declared. The architecture admits the role declaration by verifying that the credential issued to the participant authorizes the declared role at the asserted taxonomy version. A counterparty credential does not admit a regulator-role declaration; an observer credential does not admit a witness-role declaration; a participant offering a role outside the issuing authority's scope is refused at admission rather than at composition. The admission step therefore produces a role-bound participant slot before any substantive attestation is collected.

Each role carries a structurally distinct attestation requirement. Authority roles attest under elevated credential standards — multi-factor key custody, hardware-rooted signing material, or a quorum of issuing-authority signatures. Witness roles attest under proximity standards: a binding to the time, place, or sensor stream that establishes the witness's first-hand contact with the underlying event. Counterparty roles attest under transactional standards: a binding to the obligation, consideration, or commitment the counterparty is undertaking. Observer roles attest without coordinating power; their signatures enter the record but do not contribute weight to the composite-admissibility outcome. The role-specific requirement is enforced at the attestation step, so that an attestation that satisfies the standard for one role but not the standard for another cannot be silently re-tagged.

The coordination record produced by the mechanism is the tuple of role-tagged attestations together with the signed taxonomy reference and the composite-admissibility weighting function. The weighting function consumes the role-tagged attestations and produces the coordination outcome — admit, refuse, conditionally admit — with the weighting parameters themselves drawn from the taxonomy. Downstream audit verifies the record by re-running the weighting function against the role-tagged attestations and confirming the outcome; the role taxonomy that governed the original coordination is recoverable from the signed reference even if the live taxonomy has since advanced.

Operating Parameters

The operating parameters of a role-differentiated attestation deployment are the role taxonomy, the per-role evidentiary thresholds, the composite-admissibility weighting coefficients, and the taxonomy-version policy. The role taxonomy is selected for the operational domain: a defense engagement coordination uses operator, authorizing-authority, witness, and external-observer roles; a surgical-team coordination uses surgeon, anesthesiologist, circulating-nurse, and patient-advocate roles; a logistics handoff uses originating-carrier, receiving-carrier, customs-authority, and consignee roles. The taxonomy is not hard-coded into the architecture; it is a parameter supplied by the issuing authority for the deployment.

Per-role evidentiary thresholds are tuned to the consequences of admission. An authority role in a high-consequence coordination may require a quorum of two-of-three issuing-authority co-signatures plus a hardware-attestation envelope; the same role in a low-consequence coordination may require only a single signature from the issuing authority. Witness-role proximity thresholds are tuned to the event class: a sensor-stream witness for a physical event may be bound within a tens-of-milliseconds proximity window, while a documentary witness for a contractual event may be bound within a session-length window. The thresholds are bound into the signed taxonomy so that the deployment cannot silently weaken them at coordination time.

Composite-admissibility weighting coefficients determine how role-tagged attestations combine into the coordination outcome. A coordination may require all authority-role attestations to be admissible, a quorum of witness-role attestations to be admissible, and counterparty-role attestations to be admissible by each declared counterparty; observer-role attestations contribute zero weight but are recorded. The weighting function is expressed as a structured predicate over the role-tagged attestations, signed alongside the taxonomy, and re-evaluated at audit. Taxonomy-version policy governs whether a coordination initiated under one taxonomy version may admit attestations issued under a successor version: the conservative policy pins the coordination to the initiation version; a more permissive policy admits successor-version attestations whose role definitions are upward-compatible with the initiation version.

Alternative Embodiments

A first alternative embodiment supports cross-authority role mapping. When two issuing authorities maintain distinct role taxonomies and a coordination spans both authorities, a signed mapping artifact establishes the correspondence between source-taxonomy roles and target-taxonomy roles. A regulator role under one authority maps to an authorizing-authority role under the other; a witness role maps to a witness role with a translated proximity threshold. The mapping artifact is itself credentialed and signed by both authorities, so that the cross-authority coordination record carries provenance for the role correspondence as well as for the underlying attestations.

A second alternative embodiment supports role-specific dispute mechanisms. When a coordination outcome is contested, the dispute resolution path depends on which role's attestation is challenged. A challenge to a witness-role attestation invokes proximity re-verification: the witness's binding to the underlying event is re-examined against the original sensor stream, log, or co-witnessing record. A challenge to an authority-role attestation invokes credential re-verification: the issuing authority's signing material and the authority's authorization to issue the role at the relevant taxonomy version are re-examined. A challenge to a counterparty-role attestation invokes obligation re-verification. The role-tagged record makes the appropriate dispute path mechanically determinable.

A third alternative embodiment supports role-conditional admissibility. Certain coordination outcomes are admitted only when a specific role is present and attests admissibly: a regulated transfer is admitted only when a regulator-role attestation is present; an evidentiary record is admitted only when a witness-role attestation is present. Role-conditional predicates are expressed in the weighting function and are statically inspectable from the signed taxonomy, so a participant can determine in advance which roles must be present for a given coordination to succeed.

A fourth alternative embodiment supports role evolution. New roles emerging in operational ecosystems — an algorithmic-agent role in coordination involving autonomous systems, a fiduciary-observer role in coordination involving regulated investment activity — integrate by issuing a successor taxonomy version that adds the role with its evidentiary standard and admissibility weight. Existing coordinations under prior taxonomy versions continue unaffected; new coordinations initiated under the successor version admit the new role.

Composition With the n-Party Primitive

Role-differentiated attestation composes with the n-party coordination primitive disclosed in 64/049,409 by replacing the n-party primitive's flat participant set with a role-tagged participant set and replacing the flat admissibility predicate with a composite-admissibility weighting function over the role-tagged set. The composition preserves the n-party primitive's admissibility-then-substance ordering: role declarations are admitted before substantive attestation begins, and the substantive attestation is collected only against admitted role-bound slots.

The composite-admissibility weighting function is the structural locus of composition. It is a parameter of the coordination, signed alongside the role taxonomy, that consumes role-tagged attestations and produces the coordination outcome. Because the weighting function is a parameter rather than a fixed rule, the same n-party architecture supports unanimity coordinations (every role must attest admissibly), quorum coordinations (a specified subset of roles must attest admissibly), and conditional coordinations (specified roles must attest admissibly when present, and others contribute weight subject to their role-specific coefficients). The weighting function is the structural surface through which role differentiation enters the coordination outcome.

Role-differentiated attestation further composes with cross-deployment coordination. When a coordination spans deployments, each deployment's role taxonomy and weighting function are present in the coordination record alongside the cross-authority mapping artifact. The composed record is verifiable end-to-end: a downstream auditor recovers the role taxonomies, the mapping, the role-tagged attestations, and the per-deployment weighting outcomes, and re-confirms the global coordination outcome by re-running each component against the signed parameters.

Prior-Art Distinction

Conventional multi-party signing schemes — including m-of-n threshold signatures, multi-signature wallets, and notarial co-signing — treat all signers as structurally equivalent. The signing set is flat; the admissibility predicate is a count or a fixed enumeration; the resulting record does not carry the role under which each signer contributed. A threshold signature satisfied by any m of n signers cannot distinguish whether the satisfying subset included an authority signer, a witness signer, or only counterparty signers; the record is consequently inadequate for downstream audit that depends on role structure.

Conventional access-control role assignments (RBAC, ABAC, and policy-engine variants) carry roles in identity records but do not bind the role to the attestation under a signed taxonomy with role-specific evidentiary standards and a composite-admissibility weighting function. The role in conventional RBAC governs what the holder may attempt; it does not govern how the holder's attestation is weighted in a multi-party coordination outcome, and it is not signed into the coordination record alongside the substantive attestation.

Conventional notarization and witnessing schemes recognize a notary or witness role but do not generalize to a structured role taxonomy that admits operator, regulator, counterparty, and observer roles under a single coordination architecture, and do not provide a composite-admissibility weighting function that combines role-differentiated attestations into a single coordination outcome with downstream-verifiable provenance for the role structure itself.

Disclosure Scope

This disclosure encompasses any architecture in which (i) a role taxonomy is bound by signature to an issuing authority, (ii) participant credentials authorize specific roles within the signed taxonomy, (iii) per-role evidentiary standards are enforced at the attestation step, (iv) role-tagged attestations are combined into a coordination outcome by a composite-admissibility weighting function whose coefficients are signed alongside the taxonomy, and (v) the coordination record carries the role taxonomy reference, the role-tagged attestations, and the weighting function in a form that supports downstream audit.

The disclosure is not limited to the example role taxonomies (operator, regulator, witness, counterparty, observer) or to the example operational domains (defense engagement, surgical team, logistics handoff). It encompasses any signed taxonomy that distinguishes contributing roles structurally and any composite-admissibility weighting function whose coefficients depend on the declared role. Cross-authority role mapping, role-specific dispute paths, role-conditional admissibility predicates, and role-evolution through successor taxonomy versions are within the scope of the disclosure as elaborated embodiments of the underlying role-differentiation primitive.