Mission Evidence Envelope

4.1. Envelope Members

type:

REQUIRED. A string. The registered payload type (Section 4.2): the schema payload is closed to, and the verification procedure a consumer applies to the whole instance.¶

id:

REQUIRED. A string. A unique identifier for this envelope instance. ABNF: 1*64( ALPHA / DIGIT / "-" / "_" ). At least 128 bits of entropy.¶

mission:

REQUIRED. An object with id and issuer: the Mission this instance concerns.¶

emitter:

REQUIRED. An object with id (REQUIRED, a string identifying the emitting component) and role (REQUIRED, a string). This document defines one role, issuer: the Mission issuer identified by mission.issuer, or a component the issuer specifically registers to emit on its behalf (Section 4.4). A payload type registration MAY require additional roles, coordinated the same way a type value is (collision-resistant, registered alongside the type). emitter alone is a claim, not a proof of authorization; Section 4.4 fixes what a verifier additionally checks.¶

occurred_at:

REQUIRED. An RFC 3339 [RFC3339] timestamp of the event this instance records.¶

sequence:

REQUIRED. An integer, zero or greater. A per-(Mission, emitter) monotonically increasing sequence indicator: a verifier detects gaps and orders instances within (Mission, emitter). It does not by itself establish Mission-wide order across distinct emitters.¶

related:

OPTIONAL. An array, default empty. Each entry is an object with relation (REQUIRED, a collision-resistant name, the same guidance as a typ value, [I-D.draft-mcguinness-oauth-mission]) and reference (REQUIRED, a string, the correlated identifier). A registered payload type MAY require specific relation values; this document requires none.¶

payload:

REQUIRED. An object. Content fixed exclusively by the registered type's closed schema (Section 4.2). This document defines no members of its own on payload.¶

evidence_envelope:

REQUIRED. An object, the integrity protection (Section 4.5), carrying format (string, required) and value (string, required).¶

A Mission Evidence Envelope instance is closed to uncoordinated extension at this top level: a member outside this list is not part of this document's schema, and a registered payload type extends the object only through payload.¶

4.2. Payload Type Registry

type selects a registration, and a registration fixes exactly four things: the closed schema payload carries; the verification procedure a consumer applies to the whole instance, which MUST establish producer authorization under Section 4.4 and not only that the envelope integrity check of Section 4.5 passes; the producer or producer class, and the emitter.role values, authorized to emit it; and its registered type string.¶

A verifier MUST reject an instance whose type it does not recognize, and MUST NOT interpret payload under any schema other than the one the recognized type registers; an unrecognized type is refused, never processed under a guessed or default schema. This is the same reject-never-guess discipline the Mission Intent Submission envelope's evidence dispatch already applies to its own type member ([I-D.draft-mcguinness-oauth-mission]).¶

Registration requires: a collision-resistant name for type, under the same guidance as an integrity-anchor typ value ([I-D.draft-mcguinness-oauth-mission]); a stable reference defining the closed payload schema; a stable reference defining the verification procedure, including the producer-authorization check Section 4.4 requires; and the producer or producer class, and permitted emitter.role values, authoritative for instances of that type. The registration mechanics and Designated Expert criteria are in Section 9.¶

Registration is not frozen for its full lifetime. A registered type's change controller MAY publish a compatible update to its schema or verification procedure under the same type value: a clarification that does not change which bytes conform, or a security-hardening amendment that narrows what a verifier accepts without admitting anything a prior conforming verifier would have rejected, is a same-type revision, subject to the change controller's own review and a preserved change history a verifier can consult. A type value is retired and a new one registered only when a change would accept or require content an existing conforming instance does not carry, or would reinterpret an existing member's meaning: an incompatible schema change or a semantic reinterpretation. This mirrors ordinary IANA registry update practice (compatible erratum and security-update paths exist alongside the closed-question of what counts as a new registration) rather than treating every change as equivalent to inventing a new artifact. This document seeds the registry with one payload type, mission-intent-admission (Section 5.4).¶

4.3. Domain Separation

Sharing one envelope shape and one media type across every registered payload type does not relocate domain separation into a payload member the way a single flat typ value list would. Four things hold it in place instead. First, type is itself inside the bytes the evidence_envelope signs (Section 4.5): a party that relabels type without the signer's key breaks the signature, so type is tamper-evident, not an unauthenticated routing hint read before verification. Second, a verifier applies a payload's schema and verification procedure only after resolving type to exactly one registration (Section 4.2); there is no shared, generic parse of payload a verifier could apply across types. Third, a schema or procedure change that would accept or require different conforming bytes is a new type, never a silent reinterpretation of an existing one, while a compatible clarification or hardening stays reviewable against its change history (Section 4.2). Fourth, a valid signature and a schema-conformant payload are necessary but not sufficient: a verifier additionally checks that the signing emitter is authorized to speak for the named Mission and type (Section 4.4), so domain separation is never reduced to "the bytes parse and the signature verifies."¶

This is a narrower and safer construction than the single universal typ list this family previously declined: no payload member ever carries domain separation, type is bound by the signature rather than trusted as presented, every type keeps its own closed schema and verification procedure, and no signature alone establishes producer authority. It does not touch the media-type domain separation the family's existing evidence objects already carry under their own, separately registered media types ([I-D.draft-mcguinness-mission-runtime-evidence], [I-D.draft-mcguinness-oauth-mission-consent-evidence]); this document neither re-registers them nor requires that they migrate.¶

4.4. Producer Authorization

The generic envelope integrity check (Section 4.5) proves that the exact bytes of an instance, evidence_envelope excluded, are signed by whatever key the JWS kid resolves to. It does not by itself prove that the resolved key's owner is entitled to speak for the named mission.issuer, mission.id, and type: any component with a resolvable signing key can construct a well-formed, correctly signed, schema-conformant instance naming a Mission it has no relationship to, unless something additionally checks that binding.¶

A payload type's verification procedure is therefore incomplete, and non-conforming to this registry, unless it establishes all of the following before an instance is treated as verified:¶

1. which emitter.role value(s) the type permits, and that the instance's emitter.role is one of them;¶

2. how a verifier determines the canonical identity authorized to hold that role for the named mission.issuer (the issuer identity itself, or a component the issuer specifically registers, never a value the instance merely asserts about itself); and¶

3. that the JWS signing key is one that canonical authority has published, or specifically authorized, for this evidence usage, not merely a key that is resolvable somewhere.¶

A verifier MUST reject an instance failing any of these checks, treating the failure identically to a signature or schema failure: an otherwise well-formed, correctly signed, schema-conformant instance naming a Mission or producer role it is not authorized for is not verified evidence.¶

4.5. Integrity

Every committed or signed JSON value in this document satisfies the canonicalization, I-JSON conformance, and algorithm-agility rules of the Mission Substrate's Default Commitment Construction ([I-D.draft-mcguinness-mission-substrate]): JCS [RFC8785] canonicalization, parse-time duplicate-member-name rejection, the I-JSON [RFC7493] numeric and string domain, and the reject-unknown, no-downgrade rule for any algorithm prefix. This document does not restate those rules; it instantiates them.¶

A Mission Evidence Envelope instance's integrity protection is a JWS Compact Serialization [RFC7515] (format jws-compact, the only format this document defines) whose payload is the JCS canonical bytes of the instance with the evidence_envelope member removed. A verifier MUST perform the following steps, in order, and MUST NOT treat an instance as verified if any step fails:¶

1. Decode the JWS payload.¶

2. Compute the JCS canonical bytes of the outer instance with the evidence_envelope member removed.¶

3. Require byte-for-byte equality between the decoded payload of step 1 and the canonical bytes of step 2, rejecting the instance on any difference.¶

4. Verify the JWS signature and protected header against the candidate emitter's published or registered signing key.¶

5. Apply Section 4.4: reject unless the signing key, emitter, mission.issuer, and type are mutually authorized under the recognized type's registration.¶

The JWS protected header MUST carry kid (a key identifier resolvable under Section 4.4), alg (ES256 [RFC7518] mandatory to implement; an implementation MAY offer other JOSE algorithms but MUST implement ES256, and MUST reject none and any protected header whose alg does not match the algorithm family of the resolved key), typ (application/mission-evidence+jws, the one value for every payload type this envelope secures, Section 9), and cty (application/mission-evidence+json, the one media type every instance of this envelope carries regardless of type, Section 9). A verifier MUST reject a JWS whose protected typ or cty does not match these exact values.¶

Where the selected signing key is identified as compromised by the deployment-defined key-status mechanism, a verifier MUST require an independently trusted existence proof over the complete signed instance, or its unambiguous typed digest, establishing existence before the compromise boundary, before continuing verification; the instance's own asserted timestamps never satisfy this.¶

4.6. Retention

A Mission Evidence Envelope instance MUST be retained for at least the deployment's audit retention window, no shorter than the Mission's audit horizon ([I-D.draft-mcguinness-oauth-mission]). This duty falls on the producer at the moment of emission; the producer discharges it either by retaining the instance itself, or by delivering it to an evidence store or collector the deployment designates for this purpose, whose successful acknowledgment of receipt discharges the producer's own retention obligation. A producer that ceases to hold an instance after a successfully acknowledged delivery to such a collector is not, for that reason alone, non-conforming; the collector then carries the retention window. A registered payload type MAY require stricter retention, different acknowledgment semantics, or a specific durable store where its own governance requirements differ from this default.¶

4.7. Specialized Containers

Not every committed artifact belongs inside this envelope's generic payload wrapping. An SD-JWT Mandate ([I-D.draft-mcguinness-mission-mandate]) is a portable, selectively disclosable claim set whose wire form is the SD-JWT's own compact serialization; wrapping it in a JSON payload member would require re-encoding the disclosures or losing selective disclosure entirely. A SCITT Signed Statement and Receipt ([I-D.draft-mcguinness-mission-audit]) commit a payload-preimage digest at a transparency boundary under COSE, a distinct signing stack and trust model from this envelope's JOSE evidence_envelope, and registering a Receipt as a payload type here would confuse a transparency-service commitment with a producer-signed evidence record. Both stay in their own compact, natively typed wire forms, outside this registry.¶

4.8. Migration Plan (Non-Normative)

This document requires no existing evidence kind to migrate, and claims no timeline for one doing so. This section is a non-normative inventory for whichever kind's own editors choose to evaluate it, so this registry does not become, in the review's words, "a permanent parallel envelope instead of consolidation" by default.¶

Candidates fall into three tiers, ordered by how disruptive adopting this envelope would be to what already ships:¶

1. Unregistered or locally-agreed kinds with no pinned wire vector: Orchestration Evidence (mission-orchestration-evidence, a local-use identifier with no registered media type, [I-D.draft-mcguinness-oauth-mission] evidence-types catalog discussion) and Shaping Evidence (no fixed schema or media type today). Registering either as a payload type here, instead of minting its own bespoke media type, costs nothing a deployment has already pinned; this is the tier where adopting the registry is cheapest and where a first real migration, if one lands, should start.¶

2. Registered-but-unsigned kinds: Harness Evidence and Egress Evidence fix an operational typ of none today. Adding an envelope-based signed form is additive (a new option beside the existing unsigned form), not a breaking change to either.¶

3. Heavily pinned, tested kinds: Decision Evidence, Execution Evidence, Refusal Records, the Mission Receipt, Consent Evidence, and Approval Governance each carry worked test vectors and conformance-manifest coverage keyed to their current media types. Moving any of these is a breaking change to pinned vectors and requires that kind's own dedicated migration and deprecation plan, never a unilateral decision by this document.¶

Landing an actual migration is deliberately out of this document's own scope; it is flagged here as a candidate follow-on for the affected kind's own editors to schedule.¶

5.1. The Intent Admission Assertion

The evidence entry's type is mission-intent-admission-assertion. The entry is closed to exactly two members:¶

type:

REQUIRED. The string mission-intent-admission-assertion.¶

assertion:

REQUIRED. A string, a JWS Compact Serialization [RFC7515]: the Intent Admission Assertion.¶

The assertion's JOSE protected header MUST carry typ mission-intent-admission-assertion+jws, a collision-resistant value distinct from every other JWS this family defines, so an assertion of this exact type cannot be substituted for, or accepted in place of, a JWS from a different profile that happens to share a key. This typ value is not separately registered as an IANA media type: it names a JOSE object identity, never transmitted as a Content-Type, and this document mints no bespoke media type for the assertion.¶

The protected header MUST also carry alg (ES256 [RFC7518] mandatory to implement; an implementation MAY offer other JOSE algorithms but MUST implement ES256) and kid (a key identifier resolvable as described below). A verifier MUST reject an assertion whose alg is none, whose alg does not match the algorithm family of the key kid resolves to, or whose protected typ is not exactly mission-intent-admission-assertion+jws.¶

The admission issuer's key used to sign this assertion MUST be published or configured specifically for Intent Admission Assertion signing, distinct from any other key-use the admission issuer publishes (for example, a use or key_ops scoping, or a deployment-published key-purpose registration naming this exact usage). A verifier MUST reject an assertion signed by a key that is resolvable but not scoped to this usage; a multipurpose signing key with no usage scoping does not satisfy this requirement.¶

The decoded assertion's claims are closed to exactly these members:¶

iss:

REQUIRED. A string. The admission issuer: the party attesting to the Intent's originator and the admission decision, distinct from the Mission AS.¶

aud:

REQUIRED. A string. The Mission AS's issuer identifier.¶

iat, exp:

REQUIRED. RFC 3339-equivalent JWT numeric dates [RFC7519], the assertion's validity window.¶

jti:

REQUIRED. A string. The assertion identifier, unique within the admission issuer's namespace.¶

intent_hash:

REQUIRED. A string. The exact intent_hash this assertion applies to ([I-D.draft-mcguinness-oauth-mission]).¶

originator:

REQUIRED. An object with iss and sub. Who the admission issuer attests originated the Intent, distinct from the presenter below.¶

presenter:

REQUIRED. An object with client_id (REQUIRED, a string) and cnf (OPTIONAL, a confirmation-method object [RFC7800]), the party this assertion authorizes to submit the Intent.¶

admission_basis:

REQUIRED. An object with type (REQUIRED, a string, a collision-resistant name for the upstream decision class) and reference (REQUIRED, a string, an admission-issuer-scoped pointer to that decision). This document does not standardize the upstream admission or consent system reference points into.¶

status:

REQUIRED. A string. active is the only value this document defines; a verifier MUST treat any other value as not verified. status reflects the admission issuer's state at the instant it signed the assertion; it is not re-checked afterward (Section 7.2).¶

5.2. Verification Procedure

Beyond the Mission Intent Submission envelope's own dispatch rules ([I-D.draft-mcguinness-oauth-mission]), the AS verifies an entry of this type as follows, rejecting the submission with invalid_mission_intent_evidence on any failure:¶

1. Confirm the entry carries exactly type and assertion.¶

2. Decode assertion as a JWS Compact Serialization. Confirm the protected typ is exactly mission-intent-admission-assertion+jws and alg is not none.¶

3. Resolve kid in the admission issuer's key material scoped specifically to Intent Admission Assertion signing, established by deployment configuration (an issuer allowlist, a configured JWKS with usage scoping, or equivalent); this document does not standardize admission-issuer discovery. Confirm alg matches the resolved key's algorithm family.¶

4. Verify the JWS signature.¶

5. Verify aud equals this AS's issuer identifier.¶

6. Verify the current time is within iat and exp, under the deployment's clock-skew tolerance.¶

7. Atomically reserve jti: the AS MUST use an atomic compare-and-set (or equivalent single-writer-wins primitive) against a store keyed by (admission issuer, jti), succeeding only if no prior submission has reserved or committed that key within its validity window. A concurrent submission that loses the race observes reservation failure and MUST be refused as replay; it MUST NOT proceed to verify the same assertion a second time in parallel. A reservation that is not later committed (step 10) MUST be released no later than exp, freeing the identifier for a legitimate retry; a committed reservation is permanent for the window this AS retains submission records.¶

8. Verify intent_hash equals the provisional intent_hash computed at submission-processing step 3 ([I-D.draft-mcguinness-oauth-mission]).¶

9. Verify presenter.client_id, and cnf where present, equal the presenter the containing exchange established; the assertion is never an alternative client-authentication mechanism and never selects the presenter ([I-D.draft-mcguinness-oauth-mission-submission-evidence], Section "The Exchange Establishes the Presenter").¶

10. Verify status is exactly active. On success, commit the jti reservation of step 7 (permanent, see above). On failure at this step or any of steps 2-9, release the reservation.¶

This type defines no evidence-lineage exception: a shaping or approval revision that changes intent_hash requires a fresh assertion with a fresh jti, under the general rule ([I-D.draft-mcguinness-oauth-mission-submission-evidence], Section "Evidence Binds One Exact Intent").¶

Composition with creation-fingerprint idempotent recovery. On a surface that also carries a Mission-creation idempotency fingerprint (expansion, child creation; [I-D.draft-mcguinness-oauth-mission-submission-evidence], Section "Evidence on Idempotent Creation Surfaces"), this jti reservation is a distinct, submission-plane replay control, not a substitute for that fingerprint's own recovery path. Recovery of an already-completed creation operation under the fingerprint's own rules returns the recorded outcome without re-running this section's verification a second time, exactly as that rule already states; committing a jti in step 10 is what makes that recovery safe to skip re-verification against, since the original commit already proves the assertion was checked once. A fresh submission bearing a jti this AS has never seen follows the full ten-step procedure above regardless of whether it shares a creation fingerprint with an unrelated prior request.¶

5.3. Recorded Facts

On success, the verified output facts this type designates for recording as a submission_evidence element ([I-D.draft-mcguinness-oauth-mission]) are closed to exactly:¶

admission_issuer:

REQUIRED. The assertion's iss.¶

originator:

REQUIRED. The assertion's originator.¶

presenter:

REQUIRED. The assertion's presenter.¶

admission_basis:

REQUIRED. The assertion's admission_basis.¶

status:

REQUIRED. The assertion's status, as observed at admission; see Section 7.2 for what this does and does not prove afterward.¶

These facts are exactly the normalized form a submission_evidence element's facts member carries for this type ([I-D.draft-mcguinness-oauth-mission]); this document defines no independent commitment over them beyond the Mission Record's own trust, matching the OAuth binding's stated position that it commits none. A future profile whose threat model needs an independently committed root over Mission-record-derived facts, including this evidence, MAY reference the Mission Record's submission_evidence array as that normalized input without redefining its shape; this document takes no position on whether or how such a root is constructed.¶

5.4. The Intent Admission Payload Type

mission-intent-admission is a Mission Evidence Envelope payload type (Section 4.2).¶

Producer authorization (Section 4.4), instantiated for this type:¶

• emitter.role MUST be issuer; no other role is permitted for this type.¶

• emitter.id MUST equal the canonical identity of the Mission issuer named by mission.issuer, or a component that issuer specifically registers to emit this type on its behalf; it MUST NOT be accepted merely because it is a string equal to some other value the instance carries.¶

• The JWS signing key MUST be one mission.issuer (or its specifically registered component) publishes for Mission Evidence Envelope signing; a verifier MUST NOT accept a key merely because it resolves and validates, if that key is not published by the named issuer for this purpose. A valid, resolvable key belonging to a different issuer, presented over an instance naming this Mission, MUST be rejected under this rule even though the envelope integrity check of Section 4.5 would otherwise pass.¶

An AS SHOULD emit one instance at Mission creation when the approved submission carried Intent Admission Evidence, giving that admission an independently signed, portable, registrable record instead of leaving it as unanchored Mission Record metadata alone.¶

payload is closed to exactly:¶

intent_hash:

REQUIRED. A string. The admitted Mission's intent_hash ([I-D.draft-mcguinness-oauth-mission]).¶

submission_evidence:

REQUIRED. An array. The Mission Record's submission_evidence array ([I-D.draft-mcguinness-oauth-mission]), restated exactly, in the record's order.¶

disposition:

REQUIRED. A string. admitted is the only value this document defines: this payload type is emitted only where a Mission exists to reference, so no refusal outcome is representable by it. A companion needing richer admission-outcome semantics registers a new payload type rather than extending this one's closed schema (Section 4.2).¶

Beyond Section 4.5 and the producer authorization above, a verifier holding the referenced Mission Record MUST confirm payload.intent_hash and payload.submission_evidence are byte-for-byte equal, member for member, to the Mission Record's own intent_hash and submission_evidence.¶

This is an AS attestation, not independent proof of the original assertion. A verifier that has done all of the above has confirmed that the Mission issuer itself attests to having admitted this exact intent under this exact recorded evidence; it has not independently verified the admission issuer's original Intent Admission Assertion, because the payload carries only submission_evidence's digest and extracted facts (Section 5.3), never the assertion bytes themselves, and the cross-check above compares two representations that are both under the Mission issuer's own control. A party requiring independent proof of what the admission issuer signed must obtain the retained assertion artifact, or a resolvable reference to it plus its digest, and verify it directly under Section 5.2; this document does not require a Mission issuer to retain or disclose that artifact, and states no disclosure or access rule for one that is retained voluntarily. A deployment that intends independent verifiability should retain the assertion (or a digest-referenced pointer to it) and define its own disclosure policy.¶

5.5. Worked Example

An Intent Submission Evidence entry presenting an Intent Admission Assertion:¶

{
  "type": "mission-intent-admission-assertion",
  "assertion": "eyJhbGciOiJFUzI1NiIsImtpZCI6ImFkbWlzc2lvbi1rZXktMSIsInR5cCI6Im1pc3Npb24taW50ZW50LWFkbWlzc2lvbi1hc3NlcnRpb24randzIn0..."
}

The Mission Evidence Envelope instance the AS emits after admitting it:¶

{
  "type": "mission-intent-admission",
  "id": "evt_9K2nP4qV9rL3tY6sB1zN0eF7jB1zN6cQ",
  "mission": {
    "id": "msn_8RfX2Lqv9TqMv4z7sA2bN1k0YpEdHc9-",
    "issuer": "https://as.example"
  },
  "emitter": { "id": "https://as.example", "role": "issuer" },
  "occurred_at": "2026-11-02T08:00:05Z",
  "sequence": 0,
  "payload": {
    "intent_hash": "sha-256:3q4-...",
    "submission_evidence": [
      {
        "type": "mission-intent-admission-assertion",
        "artifact_hash": "sha-256:9zP-...",
        "verified_at": "2026-11-02T08:00:04Z",
        "facts": {
          "admission_issuer": "https://admission.example",
          "originator": { "iss": "https://admission.example", "sub": "user-42" },
          "presenter": { "client_id": "agent-client-7" },
          "admission_basis": { "type": "helpdesk-ticket", "reference": "TCK-88123" },
          "status": "active"
        }
      }
    ],
    "disposition": "admitted"
  },
  "evidence_envelope": {
    "format": "jws-compact",
    "value": "eyJhbGciOiJFUzI1NiIsImtpZCI6ImFzLWtleS0xIn0..."
  }
}

Three negative cases the verification procedure above refuses, none of which are pinned as byte-level vectors at this Experimental maturity:¶

Cross-issuer signature. A component holding a valid, resolvable signing key for https://as-b.example signs an otherwise well-formed mission-intent-admission instance whose mission.issuer is https://as-a.example. The envelope integrity check (Section 4.5) passes: the signature is valid and the bytes match. Producer authorization (Section 5.4) fails: the key is not one https://as-a.example publishes, so the instance is rejected.¶

Concurrent replay. Two submissions presenting assertions with the same jti arrive concurrently. Exactly one wins the atomic reservation of verification step 7; the other observes reservation failure and is refused as replay, never processed to a second, independent admission decision.¶

Cross-JOSE-type substitution. A JWS validly signed by a key resolvable in the admission issuer's key set, but whose protected typ is some other profile's value (or absent), is presented as an Intent Admission Assertion. Verification step 2 rejects it before signature verification is even meaningful for this purpose: the protected typ does not equal mission-intent-admission-assertion+jws.¶

7.1. Envelope and Registry

A shared media type and a shared JWS typ across every registered payload type do not, by themselves, prevent a well-signed instance from naming a Mission or role its signer has no relationship to; that is exactly the gap Section 4.4 closes, and a payload type registration that omits an executable producer-authorization check is non-conforming under Section 4.2, not merely incomplete. A Designated Expert reviewing a new registration (Section 9) MUST confirm the verification-procedure reference actually specifies this check; a registration whose "verification procedure" is only the generic five-step integrity algorithm, with no type-specific authorization binding, does not satisfy the registry's own requirement.¶

Producer authorization is bound to the key the named Mission issuer (or its specifically registered component) publishes. Compromise of that key defeats producer authorization the same way it would defeat any other signature-based control; this document adds no independent defense against a compromised issuer key beyond the general compromise-boundary rule of Section 4.5.¶

7.2. Intent Admission

Key-use separation. Requiring a key scoped specifically to Intent Admission Assertion signing, and a distinct protected typ (Section 5.1), defends against a cross-protocol substitution: without both, a JWS validly issued for an unrelated purpose under the same multipurpose key could otherwise be misinterpreted as an Intent Admission Assertion, since generic JWS validation alone does not distinguish one profile's tokens from another's.¶

Atomic replay control. Checking whether a jti has been consumed and then separately recording it as consumed is a check-then-act race: two concurrent submissions can both observe the identifier as unused before either records it. The atomic reserve of Section 5.2 step 7 closes this by making the reservation itself the race's single winner-take-all point, rather than treating "check" and "consume" as two independent operations a concurrent request can interleave between.¶

Status is a point-in-time attestation, not a live check. Verifying status == active at verification step 10 establishes only that the admission issuer's state was active when it signed the assertion. It does not establish that the upstream admission decision remains valid at any later time, including at the moment a verifier later inspects a retained mission-intent-admission instance or submission_evidence element. A deployment whose threat model requires currently-valid admission status, not merely status-at-signing, MUST define its own mechanism for checking current status against the admission issuer; this document provides none, and the absence of a later revocation check is not a gap this document's conformance requirements cover.¶

The emitted record is not independent proof of the inbound assertion. See Section 5.4: a verifier that trusts only the Mission issuer's own attestation, without separately verifying the original Intent Admission Assertion or a retained reference to it, has not independently corroborated what the admission issuer signed.¶

8.1. Envelope and Registry

A Mission Evidence Envelope instance's emitter, mission, and payload members may carry identifiers correlatable across a Mission's evidence stream; a registered payload type states its own minimization guidance where its payload carries personal data. This document states none for the generic envelope beyond what Section 5.3 states for Intent Admission Evidence.¶

8.2. Intent Admission

The Intent Admission Assertion's originator, and the facts recorded under Section 5.3, identify a natural person; admission_basis.reference further identifies an external ticketing or consent record. A deployment retaining mission-intent-admission payload instances SHOULD apply access control and retention discipline proportionate to that sensitivity, and MUST NOT resolve admission_basis.reference to disclose more of the upstream record than the admission issuer's own disclosure policy permits.¶

9.1. Media Type Registry

This document registers two media types per [RFC6838]: the Mission Evidence Envelope's JSON representation and its JWS-secured representation, shared by every registered payload type.¶

9.2. Mission Evidence Payload Type Registry

IANA is requested to create the "Mission Evidence Payload Types" registry. The registration policy is Specification Required [RFC8126]. A Designated Expert reviews a submission for the discipline Section 4.2 and Section 4.4 require: a Type value that is a collision-resistant name, not already registered; a stable Payload Schema Reference fixing a closed schema for payload; a stable Verification Procedure Reference fixing, beyond the shared envelope integrity procedure (Section 4.5), every check a consumer applies to that payload, including an executable producer-authorization binding of emitter, signing key, and permitted emitter.role values to the named mission.issuer and type (Section 4.4); and a Producer naming the principal or principal class, and permitted emitter.role values, authoritative for instances of the type.¶

A Designated Expert MUST reject a registration whose verification procedure reference does not fully specify payload verification and producer authorization, or whose Type would require reinterpreting an already-registered type's schema or semantics rather than adding a new one (Section 4.3). A Designated Expert MAY approve a same-Type update to an existing registration's schema or verification-procedure reference where the change controller demonstrates it is compatible (accepts no bytes an existing conforming instance would not already satisfy, and reinterprets no existing member) and preserves a change history; approval of an incompatible change requires a new Type.¶

Each registration records:¶

• Type: the payload type's collision-resistant string value.¶

• Payload Schema Reference: the specification and section defining the closed payload schema.¶

• Verification Procedure Reference: the specification and section defining the type-specific verification procedure, including its producer-authorization binding.¶

• Producer: the principal or principal class, and permitted emitter.role values, authoritative for instances of this type.¶

• Change Controller: IETF, or the registrant for any other registration.¶

• Reference: the specification defining the type.¶

This document seeds the registry with the payload type it defines:¶

Each further document that defines a Mission Evidence Envelope payload type requests that type's registration in its own IANA considerations, carrying its Internet-Draft reference as a publication dependency under this registry's policy until it is published.¶

10.1. Normative References

[I-D.draft-mcguinness-mission-substrate]

McGuinness, K., "Mission Substrate Requirements", 2026, <https://mcguinness.github.io/mission-bound-authorization/draft-mcguinness-mission-substrate.html>.

[I-D.draft-mcguinness-oauth-mission]

McGuinness, K., "Mission-Bound Authorization for OAuth 2.0", 2026, <https://mcguinness.github.io/mission-bound-authorization/draft-mcguinness-oauth-mission.html>.

[I-D.draft-mcguinness-oauth-mission-submission-evidence]

McGuinness, K., "Mission Intent Submission Evidence for OAuth 2.0", 2026, <https://mcguinness.github.io/mission-bound-authorization/draft-mcguinness-oauth-mission-submission-evidence.html>.

[RFC2119]

Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, <https://www.rfc-editor.org/rfc/rfc2119>.

[RFC3339]

Klyne, G. and C. Newman, "Date and Time on the Internet: Timestamps", RFC 3339, DOI 10.17487/RFC3339, July 2002, <https://www.rfc-editor.org/rfc/rfc3339>.

[RFC6234]

Eastlake 3rd, D. and T. Hansen, "US Secure Hash Algorithms (SHA and SHA-based HMAC and HKDF)", RFC 6234, DOI 10.17487/RFC6234, May 2011, <https://www.rfc-editor.org/rfc/rfc6234>.

[RFC6838]

Freed, N., Klensin, J., and T. Hansen, "Media Type Specifications and Registration Procedures", BCP 13, RFC 6838, DOI 10.17487/RFC6838, January 2013, <https://www.rfc-editor.org/rfc/rfc6838>.

[RFC7493]

Bray, T., Ed., "The I-JSON Message Format", RFC 7493, DOI 10.17487/RFC7493, March 2015, <https://www.rfc-editor.org/rfc/rfc7493>.

[RFC7515]

Jones, M., Bradley, J., and N. Sakimura, "JSON Web Signature (JWS)", RFC 7515, DOI 10.17487/RFC7515, May 2015, <https://www.rfc-editor.org/rfc/rfc7515>.

[RFC7518]

Jones, M., "JSON Web Algorithms (JWA)", RFC 7518, DOI 10.17487/RFC7518, May 2015, <https://www.rfc-editor.org/rfc/rfc7518>.

[RFC7519]

Jones, M., Bradley, J., and N. Sakimura, "JSON Web Token (JWT)", RFC 7519, DOI 10.17487/RFC7519, May 2015, <https://www.rfc-editor.org/rfc/rfc7519>.

[RFC7800]

Jones, M., Bradley, J., and H. Tschofenig, "Proof-of-Possession Key Semantics for JSON Web Tokens (JWTs)", RFC 7800, DOI 10.17487/RFC7800, April 2016, <https://www.rfc-editor.org/rfc/rfc7800>.

[RFC8126]

Cotton, M., Leiba, B., and T. Narten, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 8126, DOI 10.17487/RFC8126, June 2017, <https://www.rfc-editor.org/rfc/rfc8126>.

[RFC8174]

Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, <https://www.rfc-editor.org/rfc/rfc8174>.

[RFC8259]

Bray, T., Ed., "The JavaScript Object Notation (JSON) Data Interchange Format", STD 90, RFC 8259, DOI 10.17487/RFC8259, December 2017, <https://www.rfc-editor.org/rfc/rfc8259>.

[RFC8785]

Rundgren, A., Jordan, B., and S. Erdtman, "JSON Canonicalization Scheme (JCS)", RFC 8785, DOI 10.17487/RFC8785, June 2020, <https://www.rfc-editor.org/rfc/rfc8785>.

10.2. Informative References

[I-D.draft-mcguinness-mission-audit]

McGuinness, K., "Mission Audit Transparency", 2026, <https://mcguinness.github.io/mission-bound-authorization/draft-mcguinness-mission-audit.html>.

[I-D.draft-mcguinness-mission-mandate]

McGuinness, K., "Mission Mandate", 2026, <https://mcguinness.github.io/mission-bound-authorization/draft-mcguinness-mission-mandate.html>.

[I-D.draft-mcguinness-mission-runtime-evidence]

McGuinness, K., "Mission Runtime Evidence", 2026, <https://mcguinness.github.io/mission-bound-authorization/draft-mcguinness-mission-runtime-evidence.html>.

[I-D.draft-mcguinness-oauth-mission-consent-evidence]

McGuinness, K., "Mission Consent Evidence", 2026, <https://mcguinness.github.io/mission-bound-authorization/draft-mcguinness-oauth-mission-consent-evidence.html>.