{
  "@context": {
    "@version": 1.1,
    "schema": "https://schema.org/",
    "ssh": "https://www.openssh.com/vocab/",
    "sec": "https://w3id.org/security#",
    "xsd": "http://www.w3.org/2001/XMLSchema#",

    "SSHKey": "sec:Key",
    "SSHCertificate": "sec:Certificate",
    "KnownHost": "ssh:KnownHost",
    "AuthorizedKey": "ssh:AuthorizedKey",

    "id": "schema:identifier",
    "userId": {
      "@id": "ssh:owner",
      "@type": "@id"
    },
    "keyType": "sec:algorithm",
    "publicKey": "sec:publicKeyPem",
    "fingerprint": "sec:fingerprint",
    "comment": "schema:description",
    "createdAt": {
      "@id": "schema:dateCreated",
      "@type": "xsd:dateTime"
    },
    "lastUsedAt": {
      "@id": "ssh:lastUsed",
      "@type": "xsd:dateTime"
    },

    "certificate": "sec:certificate",
    "serialNumber": "sec:serialNumber",
    "principals": {
      "@id": "ssh:authorizedPrincipals",
      "@container": "@list"
    },
    "validAfter": {
      "@id": "schema:validFrom",
      "@type": "xsd:dateTime"
    },
    "validBefore": {
      "@id": "schema:validThrough",
      "@type": "xsd:dateTime"
    },
    "certType": "ssh:certificateType",

    "hostname": "schema:name",
    "username": "schema:identifier",
    "options": "ssh:authorizedKeyOptions"
  }
}