diff --git a/api/endorsement-provisioning/README.md b/api/endorsement-provisioning/README.md
index 01e7f49..1a5522e 100644
--- a/api/endorsement-provisioning/README.md
+++ b/api/endorsement-provisioning/README.md
@@ -132,3 +132,88 @@ format is CoRIM.
     "expiry": "2030-10-12T07:20:50.52Z"
   }
 ```
+
+# Endorsement Lifecycle Management (ELM) Interface
+
+This interface can be used for activating/deactivating endorsements provisioned
+to the verifier. It uses the CoSERV base types to define an ELM query that 
+can be used to select endorsements using either (stateful) environments or one or
+more RIM identifiers.
+
+## Query Format
+
+Following is the CDDL format for an ELM query:
+```
+elm-query = {
+ ( environment-query // rim-query )
+}
+
+environment-query = (
+  &(profile: 0) => coserv.profile
+  &(artifact-type: 1) => coserv.artifact-type
+  &(environment-selector: 2) => coserv.environment-selector-map
+)
+
+rim-query = (
+  &(rim-selector: 3) => [ + coserv.rim-selector-id ]
+)
+```
+
+## Examples
+
+### Deactivate keys
+Use the `environment-query` variant to deactivate two keys by `instance-id`.
+
+#### Request
+
+```http
+POST /endorsement-provisioning/v1/deactivate
+Host: veraison.example
+Content-Type: application/vnd.veraison.elm-v1+cbor
+
+-- body in EDN
+
+{
+  / profile /              0: "tag:arm.com,2025/example-profile",
+  / artifact-type /        1: 1, / trust-anchors /
+  / environment-selector / 2: {
+    / instance / 1: [ 
+      [ 550( h'01 ...' ) ],
+      [ 550( h'01 ...' ) ]
+    ]
+  }
+}
+```
+
+#### Response
+
+```http
+HTTP/1.1 204 No Content
+```
+
+### Activate RIMs
+Use the `rim-query` variant to activate two CoRIMs and one CoMID.
+
+#### Request
+
+```http
+POST /endorsement-provisioning/v1/activate
+Host: veraison.example
+Content-Type: application/vnd.veraison.elm-v1+cbor
+
+-- body in EDN
+
+{
+  / rim-id selector / 3: [
+    [ / corim / 2, / CoRIM id / "corim-acme-gizmo-1.0.0" ],
+    [ / corim / 2, / CoRIM id / "corim-acme-gizmo-1.2.0" ],
+    [ / comid / 0, / CoMID id / "d7bd6c2c-4844-48e4-a794-eeafdff128df" ]
+  ]
+}
+```
+
+#### Response
+
+```http
+HTTP/1.1 204 No Content
+```
\ No newline at end of file
diff --git a/api/endorsement-provisioning/endorsement-provisioning.yaml b/api/endorsement-provisioning/endorsement-provisioning.yaml
index 4e0e9eb..9b64708 100644
--- a/api/endorsement-provisioning/endorsement-provisioning.yaml
+++ b/api/endorsement-provisioning/endorsement-provisioning.yaml
@@ -1,8 +1,8 @@
 openapi: '3.0.0'
 
 info:
-  title: attestation endorsement provisioning
-  description: API to provision endorsements. For further details, see datatracker.ietf.org/doc/draft-birkholz-rats-corim
+  title: Attestation endorsement provisioning and management
+  description: API to provision and manage endorsements. For further details, see datatracker.ietf.org/doc/draft-ietf-rats-corim/
   version: '1.0.0alpha'
 servers:
   - url: 'https://veraison.example/endorsement-provisioning/v1'
@@ -66,6 +66,57 @@ paths:
                 $ref: './schemas/components.yaml#/components/schemas/SessionResource'
         default:
           $ref: './schemas/components.yaml#/components/responses/Error'
+  /activate:
+    post:
+      summary: Activate triples matching an endorsement lifecycle mgmt (ELM) query
+      description: >
+        Activates triples selected by a CBOR-encoded ELM query.
+        Operation is idempotent and atomic, i.e., if any requested 
+        activation fails, no changes are applied.
+      operationId: activateEndorsements
+      requestBody:
+        required: true
+        content:
+          application/vnd.veraison.elm-v1+cbor:
+            schema:
+              $ref: './schemas/components.yaml#/components/schemas/ELMQuery'
+      responses:
+        '204':
+          description: Activation successful
+        '404':
+          description: No matching endorsements found
+          content:
+            application/concise-problem-details+cbor:
+              schema:
+                $ref: './schemas/components.yaml#/components/schemas/ConciseProblem'
+        default:
+          $ref: './schemas/components.yaml#/components/responses/ConciseError'
+
+  /deactivate:
+    post:
+      summary: Deactivate triples matching an ELM query
+      description: >
+        Deactivates triples selected by a CBOR-encoded ELM query.
+        Operation is idempotent and atomic, i.e., if any requested 
+        deactivation fails, no changes are applied.
+      operationId: deactivateEndorsements
+      requestBody:
+        required: true
+        content:
+          application/vnd.veraison.elm-v1+cbor:
+            schema:
+              $ref: './schemas/components.yaml#/components/schemas/ELMQuery'
+      responses:
+        '204':
+          description: Deactivation successful
+        '404':
+          description: No matching endorsements found
+          content:
+            application/concise-problem-details+cbor:
+              schema:
+                $ref: './schemas/components.yaml#/components/schemas/ConciseProblem'
+        default:
+          $ref: './schemas/components.yaml#/components/responses/ConciseError'
 components:
   parameters:
     SessionID:
diff --git a/api/endorsement-provisioning/schemas/components.yaml b/api/endorsement-provisioning/schemas/components.yaml
index e549901..48911dd 100644
--- a/api/endorsement-provisioning/schemas/components.yaml
+++ b/api/endorsement-provisioning/schemas/components.yaml
@@ -26,6 +26,13 @@ components:
           type: string
           description: >
             Optional field to provide more details about the failure cause when provisioning status is `failed`
+    
+    ELMQuery:
+      type: string
+      format: binary
+      description: >
+        CBOR-encoded endorsement lifecycle management query object using the CoSERV data model.
+    
     Problem:
       required:
         - title
@@ -67,6 +74,32 @@ components:
             the problem.  It may or may not yield further information if
             dereferenced.
           example: https://veraison.example/v1/problems/404
+
+    ConciseProblem:
+      required:
+      - title
+      properties:
+        title:
+          type: string
+          description: >
+            A short, human-readable summary of the problem type.  It SHOULD NOT
+            change from occurrence to occurrence of the problem, except for
+            purposes of localization (e.g., using proactive content
+            negotiation; see [RFC7231], Section 3.4).
+          example: Not Found
+        detail:
+          type: string
+          description: >
+            A human-readable explanation specific to this occurrence
+            of the problem.
+          example: no active session could be located at the requested URL
+      additionalProperties: true
+      description: >
+          Problem Details object encoded as CBOR and carried in the
+          application/concise-problem-details+cbor media type as defined
+          by Appendix B of RFC 9290.
+          See: rfc-editor.org/rfc/rfc9290#name-basic-problem-details
+
   responses:
     Error:
       description: >
@@ -75,3 +108,10 @@ components:
         application/problem+json:
           schema:
             $ref: '#/components/schemas/Problem'
+    ConciseError:
+      description: >
+        Unexpected error
+      content:
+        application/concise-problem-details+cbor:
+          schema:
+            $ref: '#/components/schemas/ConciseProblem'
\ No newline at end of file
diff --git a/api/well-known/schemas/components.yaml b/api/well-known/schemas/components.yaml
index e2cbefa..a633956 100644
--- a/api/well-known/schemas/components.yaml
+++ b/api/well-known/schemas/components.yaml
@@ -11,6 +11,10 @@ components:
           $ref: '#/components/schemas/PublicKey'
           description:
             Public key and algorithm to be used to verify the Attestation Result
+        activate-on-submit:
+          type: boolean
+          description: >
+            Activate endorsements on submission
         media-types:
           type: array
           items: