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Membership Credentials

Membership credentials attest to an organization's participation in ASCS e.V. programs. Two credential types form a hierarchical structure: a base membership is required before an ENVITED membership can be issued.

Credential Types

Credential Type Subject Type Description
simpulseid:AscsBaseMembershipCredential simpulseid:AscsBaseMembership ASCS e.V. base membership
simpulseid:AscsEnvitedMembershipCredential simpulseid:AscsEnvitedMembership ASCS e.V. ENVITED program membership

Both extend HarbourCredential and use urn:uuid: identifiers for the credential subject (not DIDs), because membership records are issuer-managed rather than self-sovereign.

Base Membership

The AscsBaseMembershipCredential attests that an organization is a member of ASCS e.V.

Fields

Field Type Required Description
member URI ✅ DID of the member organization
programName string — Name of the membership program
hostingOrganization URI — DID of the hosting organization (ASCS e.V.)
memberSince date — Date membership was granted

Example

{
  "@context": [
    "https://www.w3.org/ns/credentials/v2",
    "https://w3id.org/gaia-x/development#",
    "https://w3id.org/reachhaven/harbour/core/v1/",
    "https://w3id.org/reachhaven/harbour/gx/v1/",
    "https://w3id.org/ascs-ev/simpulse-id/v1/"
  ],
  "type": ["VerifiableCredential", "simpulseid:AscsBaseMembershipCredential"],
  "issuer": "did:ethr:0x14a34:0x50916c8e454722d2357916d4250500102288bb03",
  "validFrom": "2025-08-06T10:15:22Z",
  "credentialSubject": {
    "id": "urn:uuid:22423d4a-4281-4251-b1e4-1afaa96f1a15",
    "type": "simpulseid:AscsBaseMembership",
    "member": "did:ethr:0x14a34:0x9d273DCaC2f6367968d61caf69A7E3177fd81048",
    "programName": "ASCS e.V. Base Membership",
    "hostingOrganization": "did:ethr:0x14a34:0x50916c8e454722d2357916d4250500102288bb03",
    "memberSince": "2023-01-01"
  }
}

ENVITED Membership

The AscsEnvitedMembershipCredential attests to participation in the ENVITED program. It requires a reference to an existing base membership credential.

Additional Fields

In addition to all base membership fields:

Field Type Required Description
baseMembershipCredential URI ✅ IRI of the prerequisite AscsBaseMembershipCredential

Example

{
  "@context": [
    "https://www.w3.org/ns/credentials/v2",
    "https://w3id.org/gaia-x/development#",
    "https://w3id.org/reachhaven/harbour/core/v1/",
    "https://w3id.org/reachhaven/harbour/gx/v1/",
    "https://w3id.org/ascs-ev/simpulse-id/v1/"
  ],
  "type": ["VerifiableCredential", "simpulseid:AscsEnvitedMembershipCredential"],
  "issuer": "did:ethr:0x14a34:0x50916c8e454722d2357916d4250500102288bb03",
  "validFrom": "2025-08-06T10:15:22Z",
  "credentialSubject": {
    "id": "urn:uuid:bac22d92-7de7-40e8-b887-d9daf00208a2",
    "type": "simpulseid:AscsEnvitedMembership",
    "member": "did:ethr:0x14a34:0x9d273DCaC2f6367968d61caf69A7E3177fd81048",
    "programName": "ASCS e.V. ENVITED Membership",
    "hostingOrganization": "did:ethr:0x14a34:0x50916c8e454722d2357916d4250500102288bb03",
    "memberSince": "2023-01-01",
    "baseMembershipCredential": "urn:uuid:7f3f7c6a-4b4d-4e9e-8f0a-9b1b2c3d4e5f"
  }
}

SD-JWT-VC Claim Mapping

Base Membership

Always Disclosed Selectively Disclosed
member, programName memberSince, hostingOrganization

ENVITED Membership

Always Disclosed Selectively Disclosed
member, programName, baseMembershipCredential memberSince, hostingOrganization

Issuance Flow

flowchart LR
    A[ParticipantCredential] -->|prerequisite| B[AscsBaseMembershipCredential]
    B -->|referenced by| C[AscsEnvitedMembershipCredential]
  1. The organization must hold a ParticipantCredential
  2. ASCS e.V. issues an AscsBaseMembershipCredential (the member field references the organization's DID)
  3. ASCS e.V. issues an AscsEnvitedMembershipCredential that references the base membership via baseMembershipCredential

Schema Definition

Defined in linkml/simpulseid-core.yaml (classes AscsBaseMembership, AscsEnvitedMembership) and linkml/simpulseid-credentials.yaml (classes AscsBaseMembershipCredential, AscsEnvitedMembershipCredential).

See Also