sample code for ngsildproof

{

  "id": "urn:ngsi-ld:Store:002",

  "type": "Store",

  "address": {

    "type": "Property",

    "value": {

      "streetAddress": ["Tiger Street 4", "al"],

      "addressRegion": "Metropolis",

      "addressLocality": "Cat City",

      "postalCode": "42420"

    }

  },

  "location": {

    "type": "GeoProperty",

    "value": {

      "type": "Point",

      "coordinates": [57.5522, -20.3484]

    }

  },

  "ngsildproof": {

    "type": "Property",

    "entityIdSealed": "urn:ngsi-ld:Store:002",

    "entityTypeSealed": "Store",

    "proof": {

      "type": "DataIntegrityProof",

      "created": "2024-12-09T16:37:48Z",

      "verificationMethod": "https://example.edu/issuers/565049#z6MkwXG2WjeQnNxSoynSGYU8V9j3QzP3JSqhdmkHc6SaVWoT",

      "cryptosuite": "eddsa-rdfc-2022",

      "proofPurpose": "assertionMethod",

      "proofValue": "z5bEiXJXYgCcEotho4K1i5bX8A8BUkQt2rRvLYSULM8P8nh4VQdkjSt9wm33p7PcPgJajBwsoiNarT9BTMXMPPTVr"

    }

  },

  "@context": "https://roughly-cosmic-aardvark.ngrok-free.app/store-context.jsonld"

}

"ngsildproof": {

  "type": "Property",

  "entityIdSealed": "urn:ngsi-ld:Store:002",

  "entityTypeSealed": "Store",

  "proof": {

    "type": "DataIntegrityProof",

    "created": "2025-01-27T21:02:24Z",

    "verificationMethod": "https://example.edu/issuers/565049#z6MkwXG2WjeQnNxSoynSGYU8V9j3QzP3JSqhdmkHc6SaVWoT",

    "cryptosuite": "eddsa-rdfc-2022",

    "proofPurpose": "assertionMethod",

    "proofValue": "z3XrH3diVCqpVHXkE7WbnictqyQCkJBGTxHSqbCQvpXMw7o5UQqbNi67J15Q9tx7tvsNRTzmuoWU1Y2FyqGfSV9eS"

  }

}

 No newline at end of file

import jsigs from 'jsonld-signatures';

const {purposes: {AssertionProofPurpose}} = jsigs;

import * as Ed25519Multikey from '@digitalbazaar/ed25519-multikey';

import {DataIntegrityProof} from '@digitalbazaar/data-integrity';

import {cryptosuite as eddsaRdfc2022CryptoSuite} from '@digitalbazaar/eddsa-rdfc-2022-cryptosuite';

import fetch from 'node-fetch';

// Create an in-memory map of documents keyed by their URLs

const documents = new Map();

// Define the addDocumentToLoader function

function addDocumentToLoader({url, document}) {

  documents.set(url, {

    documentUrl: url,

    document,

    contextUrl: null

  });

}

// Define the documentLoader that uses this map

const documentLoader = async url => {

  // If the document is known, return it

  if (documents.has(url)) {

    return {

      contextUrl: null,

      documentUrl: url,

      document: documents.get(url).document

    };

  }

  // Else, you may want to fallback to a default loader or throw an error

  if (url.startsWith('https://www.w3.org/2018/credentials/v1')

    || url.startsWith('https://w3id.org/security/suites/ed25519-2020/v1')

    || url.startsWith('https://w3id.org/security/data-integrity/v2')

    || url.startsWith('https://forge.etsi.org/rep/cim/NGSI-LD/')

    || url.startsWith('https://uri.etsi.org/ngsi-ld')) {

    return {

      contextUrl: null, // this is for a context via a link header

      document: await fetch(url).then(res => res.json()), // this is the actual document that was loaded

      documentUrl: url // this is the actual context URL after redirects

    };

  }

  // If no match is found, throw an error

  throw new Error(`Document loader unable to load URL: ${url}`);

}

// create the JSON-LD document that should be signed

let ngsilddoc = {

  "id": "urn:ngsi-ld:Store:002",

  "type": "Store",

  "address": {

    "type": "Property",

    "value": {

      "streetAddress": ["Tiger Street 4", "al"],

      "addressRegion": "Metropolis",

      "addressLocality": "Cat City",

      "postalCode": "42420"

    }

  },

  "@context": "https://uri.etsi.org/ngsi-ld/primer/store-context.jsonld"

};

// create the keypair to use when signing

const controller = 'https://example.edu/issuers/565049';

const keyPair = await Ed25519Multikey.from({

  '@context': 'https://w3id.org/security/multikey/v1',

  type: 'Multikey',

  controller,

  id: controller + '#z6MkwXG2WjeQnNxSoynSGYU8V9j3QzP3JSqhdmkHc6SaVWoT',

  publicKeyMultibase: 'z6MkwXG2WjeQnNxSoynSGYU8V9j3QzP3JSqhdmkHc6SaVWoT',

  secretKeyMultibase: 'zrv3rbPamVDGvrm7LkYPLWYJ35P9audujKKsWn3x29EUiGwwhdZQd' +

    '1iHhrsmZidtVALBQmhX3j9E5Fvx6Kr29DPt6LH'

});

// export public key and add to document loader

const publicKey = await keyPair.export({publicKey: true, includeContext: true});

addDocumentToLoader({url: publicKey.id, document: publicKey});

// create key's controller document

const controllerDoc = {

  '@context': [

    'https://www.w3.org/ns/did/v1',

    'https://w3id.org/security/multikey/v1'

  ],

  id: controller,

  assertionMethod: [publicKey]

};

addDocumentToLoader({url: controllerDoc.id, document: controllerDoc});

// create suite

const suite = new DataIntegrityProof({

  signer: keyPair.signer(), cryptosuite: eddsaRdfc2022CryptoSuite

});

// create signed credential

const signeddoc = await jsigs.sign(ngsilddoc, {

  suite,

  purpose: new AssertionProofPurpose(),

  documentLoader

});

console.log(JSON.stringify(signeddoc));

{

  "@context": {

    "@version": 1.1,

    "@protected": true,

    "ngsi-ld": "https://uri.etsi.org/ngsi-ld/",

    "geojson": "https://purl.org/geojson/vocab#",

    "id": "@id",

    "type": "@type",

    "Attribute": "ngsi-ld:Attribute",

    "AttributeList": "ngsi-ld:AttributeList",

    "ContextSourceIdentity": "ngsi-ld:ContextSourceIdentity",

    "ContextSourceNotification": "ngsi-ld:ContextSourceNotification",

    "ContextSourceRegistration": "ngsi-ld:ContextSourceRegistration",

    "Date": "ngsi-ld:Date",

    "DateTime": "ngsi-ld:DateTime",

    "EntityType": "ngsi-ld:EntityType",

    "EntityTypeInfo": "ngsi-ld:EntityTypeInfo",

    "EntityTypeList": "ngsi-ld:EntityTypeList",

    "Feature": "geojson:Feature",

    "FeatureCollection": "geojson:FeatureCollection",

    "GeoProperty": "ngsi-ld:GeoProperty",

    "GeometryCollection": "geojson:GeometryCollection",

    "JsonProperty": "ngsi-ld:JsonProperty",

    "LanguageProperty": "ngsi-ld:LanguageProperty",

    "LineString": "geojson:LineString",

    "ListProperty": "ngsi-ld:ListProperty",

    "ListRelationship": "ngsi-ld:ListRelationship",

    "MultiLineString": "geojson:MultiLineString",

    "MultiPoint": "geojson:MultiPoint",

    "MultiPolygon": "geojson:MultiPolygon",

    "Notification": "ngsi-ld:Notification",

    "Point": "geojson:Point",

    "Polygon": "geojson:Polygon",

    "Property": "ngsi-ld:Property",

    "Relationship": "ngsi-ld:Relationship",

    "Subscription": "ngsi-ld:Subscription",

    "TemporalProperty": "ngsi-ld:TemporalProperty",

    "Time": "ngsi-ld:Time",

    "VocabProperty": "ngsi-ld:VocabProperty",

    "accept": "ngsi-ld:accept",

    "attributeCount": "attributeCount",

    "attributeDetails": "attributeDetails",

    "attributeList": {

      "@id": "ngsi-ld:attributeList",

      "@type": "@vocab"

    },

    "attributeName": {

      "@id": "ngsi-ld:attributeName",

      "@type": "@vocab"

    },

    "attributeNames": {

      "@id": "ngsi-ld:attributeNames",

      "@type": "@vocab"

    },

    "attributeTypes": {

      "@id": "ngsi-ld:attributeTypes",

      "@type": "@vocab"

    },

    "attributes": {

      "@id": "ngsi-ld:attributes",

      "@type": "@vocab"

    },

    "attrs": "ngsi-ld:attrs",

    "avg": {

      "@id": "ngsi-ld:avg",

      "@container": "@list"

    },

    "bbox": {

      "@container": "@list",

      "@id": "geojson:bbox"

    },

    "cacheDuration": "ngsi-ld:cacheDuration",

    "containedBy": "ngsi-ld:isContainedBy",

    "contextSourceAlias": "ngsi-ld:contextSourceAlias",

    "contextSourceExtras": {

      "@id": "ngsi-ld:contextSourceExtras",

      "@type": "@json"

    },

    "contextSourceInfo": "ngsi-ld:contextSourceInfo",

    "contextSourceTimeAt": {

      "@id": "ngsi-ld:contextSourceTimeAt",

      "@type": "DateTime"

    }, 

    "contextSourceUptime": "ngsi-ld:contextSourceUptime",

    "cooldown": "ngsi-ld:cooldown",

    "coordinates": {

      "@container": "@list",

      "@id": "geojson:coordinates"

    },

    "createdAt": {

      "@id": "ngsi-ld:createdAt",

      "@type": "DateTime"

    },

    "csf": "ngsi-ld:csf",

    "data": "ngsi-ld:data",

    "dataset": {

      "@id": "ngsi-ld:hasDataset",

      "@container": "@index"

    },

    "datasetId": {

      "@id": "ngsi-ld:datasetId",

      "@type": "@id"

    },

    "deletedAt": {

      "@id": "ngsi-ld:deletedAt",

      "@type": "DateTime"

    }, 

    "description": "http://purl.org/dc/terms/description",

    "detail": "ngsi-ld:detail",

    "distinctCount": {

      "@id": "ngsi-ld:distinctCount",

      "@container": "@list"

    },

    "endAt": {

      "@id": "ngsi-ld:endAt",

      "@type": "DateTime"

    },

    "endTimeAt": {

      "@id": "ngsi-ld:endTimeAt",

      "@type": "DateTime"

    },

    "endpoint": "ngsi-ld:endpoint",

    "entities": "ngsi-ld:entities",

    "entity": "ngsi-ld:entity",

    "entityCount": "ngsi-ld:entityCount",

    "entityId": {

      "@id": "ngsi-ld:entityId",

      "@type": "@id"

    },

    "entityList": {

      "@id": "ngsi-ld:entityList",

      "@container": "@list"

    },

    "entityMap": "ngsi-ld:hasEntityMap",

    "error": "ngsi-ld:error",

    "errors": "ngsi-ld:errors",

    "expandValues": "ngsi-ld:expandValues",

    "expiresAt": {

      "@id": "ngsi-ld:expiresAt",

      "@type": "DateTime"

    },

    "features": {

      "@container": "@set",

      "@id": "geojson:features"

    },

    "format": "ngsi-ld:format",

    "geoQ": "ngsi-ld:geoQ",

    "geometry": "geojson:geometry",

    "geometryProperty": "geojson:geometryProperty",

    "geoproperty": "ngsi-ld:geoproperty",

    "georel": "ngsi-ld:georel",

    "idPattern": "ngsi-ld:idPattern",

    "information": "ngsi-ld:information",

    "instanceId": {

      "@id": "ngsi-ld:instanceId",

      "@type": "@id"

    },

    "isActive": "ngsi-ld:isActive",

    "join": "ngsi-ld:join",

    "joinLevel": "ngsi-ld:hasJoinLevel",

    "json": {

      "@id": "ngsi-ld:hasJSON", 

      "@type": "@json"

    },

    "jsonKeys": "ngsi-ld:jsonKeys",

    "jsons": {

      "@id": "ngsi-ld:jsons",

      "@container": "@list"

    },

    "key": "ngsi-ld:hasKey",

    "lang": "ngsi-ld:lang",

    "languageMap": {

      "@id": "ngsi-ld:hasLanguageMap",

      "@container": "@language"

    },

    "languageMaps": {

      "@id": "ngsi-ld:hasLanguageMaps",

      "@container": "@list"

    },

    "lastFailure": {

      "@id": "ngsi-ld:lastFailure",

      "@type": "DateTime"

    },

    "lastNotification": {

      "@id": "ngsi-ld:lastNotification",

      "@type": "DateTime"

    },

    "lastSuccess": {

      "@id": "ngsi-ld:lastSuccess",

      "@type": "DateTime"

    },

    "linkedMaps": "ngsi-ld:linkedMaps",

    "localOnly": "ngsi-ld:localOnly",

    "location": "ngsi-ld:location",

    "management": "ngsi-ld:management",

    "managementInterval": "ngsi-ld:managementInterval",

    "max": {

      "@id": "ngsi-ld:max",

      "@container": "@list"

    },

    "min": {

      "@id": "ngsi-ld:min",

      "@container": "@list"

    },

    "mode": "ngsi-ld:mode",

    "modifiedAt": {

      "@id": "ngsi-ld:modifiedAt",

      "@type": "DateTime"

    },

    "ngsildproof": {

      "@id": "ngsi-ld:ngsildproof",

      "@context": [{

        "entityIdSealed": "ngsi-ld:entityIdSealed",

        "entityTypeSealed": {

          "@id": "ngsi-ld:entityTypeSealed",

          "@type": "@vocab"

        }

      },

      "https://w3id.org/security/data-integrity/v2"

      ]

    },

    "notification": "ngsi-ld:notification",

    "notificationTrigger": "ngsi-ld:notificationTrigger",

    "notifiedAt": {

      "@id": "ngsi-ld:notifiedAt",

      "@type": "DateTime"

    },

    "notifierInfo": "ngsi-ld:notifierInfo",

    "notUpdated": "ngsi-ld:notUpdated",

    "object": {

      "@id": "ngsi-ld:hasObject",

      "@type": "@id"

    },

    "objectList": {

      "@id": "ngsi-ld:hasObjectList",

      "@container": "@list"

    },

    "objects": {

      "@id": "ngsi-ld:hasObjects",

      "@container": "@list"

    },

    "objectsLists": {

      "@id": "ngsi-ld:hasObjectsLists",

      "@container": "@list"

    },

    "objectType": {

      "@id": "ngsi-ld:hasObjectType",

      "@type": "@vocab"

    },

    "observationInterval": "ngsi-ld:observationInterval",

    "observationSpace": "ngsi-ld:observationSpace",

    "observedAt": {

      "@id": "ngsi-ld:observedAt",

      "@type": "DateTime"

    },

    "omit": "ngsi-ld:omit",

    "operationSpace": "ngsi-ld:operationSpace",    

    "operations": "ngsi-ld:operations",

    "pick": "ngsi-ld:pick",

    "previousJson": {

      "@id": "ngsi-ld:hasPreviousJson",

      "@type": "@json"

    },

    "previousLanguageMap": {

      "@id": "ngsi-ld:hasPreviousLanguageMap",

      "@container": "@language"

    },

    "previousObject": {

      "@id": "ngsi-ld:hasPreviousObject",

      "@type": "@id"

    },

    "previousObjectList": {

      "@id": "ngsi-ld:hasPreviousObjectList",

      "@container": "@list"

    },

    "previousValue": "ngsi-ld:hasPreviousValue",

    "previousValueList": {

      "@id": "ngsi-ld:hasPreviousValueList",

      "@container": "@list"

    },

    "previousVocab": {

      "@id": "ngsi-ld:hasPreviousVocab",

      "@type": "@vocab"

    },

    "properties": "geojson:properties",

    "propertyNames": {

      "@id": "ngsi-ld:propertyNames",

      "@type": "@vocab"

    },

    "q": "ngsi-ld:q",

    "reason": "ngsi-ld:reason",

    "receiverInfo": "ngsi-ld:receiverInfo",

    "refreshRate": "ngsi-ld:refreshRate",    

    "registrationId": "ngsi-ld:registrationId",

    "registrationName": "ngsi-ld:registrationName",

    "relationshipNames": {

      "@id": "ngsi-ld:relationshipNames",

      "@type": "@vocab"

    },

    "scope": "ngsi-ld:scope",

    "scopeQ": "ngsi-ld:scopeQ",

    "showChanges": "ngsi-ld:showChanges",

    "startAt": {

      "@id": "ngsi-ld:startAt",

      "@type": "DateTime"

    },

    "status": "ngsi-ld:status",

    "stddev": {

      "@id": "ngsi-ld:stddev",

      "@container": "@list"

    },

    "subscriptionId": {

      "@id": "ngsi-ld:subscriptionId",

      "@type": "@id"

    },

    "subscriptionName": "ngsi-ld:subscriptionName",

    "success": {

      "@id": "ngsi-ld:success",

      "@type": "@id"

    },

    "sum": {

      "@id": "ngsi-ld:sum",

      "@container": "@list"

    },

    "sumsq": {

      "@id": "ngsi-ld:sumsq",

      "@container": "@list"

    },

    "sysAttrs": "ngsi-ld:sysAttrs",

    "temporalQ": "ngsi-ld:temporalQ",

    "tenant": {

      "@id": "ngsi-ld:tenant",

      "@type": "@id"

    },

    "throttling": "ngsi-ld:throttling",

    "timeAt": {

      "@id": "ngsi-ld:timeAt",

      "@type": "DateTime"

    },

    "timeInterval": "ngsi-ld:timeInterval",

    "timeout": "ngsi-ld:timeout",

    "timeproperty": "ngsi-ld:timeproperty",

    "timerel": "ngsi-ld:timerel",

    "timesFailed": "ngsi-ld:timesFailed",

    "timesSent": "ngsi-ld:timesSent",

    "title": "http://purl.org/dc/terms/title",

    "totalCount": {

      "@id": "ngsi-ld:totalCount",

      "@container": "@list"

    },

    "triggerReason": "ngsi-ld:triggerReason",

    "typeList": {

      "@id": "ngsi-ld:typeList",

      "@type": "@vocab"

    },

    "typeName": {

      "@id": "ngsi-ld:typeName",

      "@type": "@vocab"

    },

    "typeNames": {

      "@id": "ngsi-ld:typeNames",

      "@type": "@vocab"

    },

    "unchanged": "ngsi-ld:unchanged",

    "unitCode": "ngsi-ld:unitCode",

    "updated": "ngsi-ld:updated",

    "uri": "ngsi-ld:uri",

    "value": "ngsi-ld:hasValue",

    "valueList": {

      "@id": "ngsi-ld:hasValueList",

      "@container": "@list"

    },

    "valueLists": {

      "@id": "ngsi-ld:hasValueLists",

      "@container": "@list"

    },

    "values": {

      "@id": "ngsi-ld:hasValues",

      "@container": "@list"

    },

    "vocab": {

      "@id": "ngsi-ld:hasVocab",

      "@type": "@vocab"

    },

    "vocabs": {

      "@id": "ngsi-ld:hasVocabs",

      "@container": "@list"

    },

    "watchedAttributes": {

      "@id": "ngsi-ld:watchedAttributes",

      "@type": "@vocab"

    },

    "@vocab": "https://uri.etsi.org/ngsi-ld/default-context/"

  }

}

 No newline at end of file

{

    "@context": [

      {

        "Customer": "https://uri.etsi.org/ngsi-ld/primer/Customer",

        "InventoryItem": "https://uri.etsi.org/ngsi-ld/primer/InventoryItem",

        "Product": "https://uri.etsi.org/ngsi-ld/primer/Product",

        "Shelf": "https://uri.etsi.org/ngsi-ld/primer/Shelf",

        "Store": "https://uri.etsi.org/ngsi-ld/primer/Store",

        "Wine": "https://uri.etsi.org/ngsi-ld/primer/Wine",

        "address": "https://uri.etsi.org/ngsi-ld/primer/address",

        "addressLocality": "https://uri.etsi.org/ngsi-ld/primer/addressLocality",

        "addressRegion": "https://uri.etsi.org/ngsi-ld/primer/addressRegion",

        "brand": "https://uri.etsi.org/ngsi-ld/primer/brand",

        "contains": "https://uri.etsi.org/ngsi-ld/primer/contains",

        "customerName": "https://uri.etsi.org/ngsi-ld/primer/customerName",

        "hasPurchased": "https://uri.etsi.org/ngsi-ld/primer/hasPurchased",

        "hasPurchasedAt": "https://uri.etsi.org/ngsi-ld/primer/hasPurchasedAt",

        "hasVisited": "https://uri.etsi.org/ngsi-ld/primer/hasVisited",

        "holds": "https://uri.etsi.org/ngsi-ld/primer/holds",

        "isContainedIn": "https://uri.etsi.org/ngsi-ld/primer/isContainedIn",

        "isHeldIn": "https://uri.etsi.org/ngsi-ld/primer/isHeldIn",

        "isInventoryOf": "https://uri.etsi.org/ngsi-ld/primer/isInventoryOf",

        "isMeasuredBy": "https://uri.etsi.org/ngsi-ld/primer/isMeasuredBy",

        "maxCapacity": "https://uri.etsi.org/ngsi-ld/primer/maxCapacity",

        "minCapacity": "https://uri.etsi.org/ngsi-ld/primer/minCapacity",

        "owner": "https://uri.etsi.org/ngsi-ld/primer/owner",

        "postalCode": "https://uri.etsi.org/ngsi-ld/primer/postalCode",

        "price": "https://uri.etsi.org/ngsi-ld/primer/price",

        "productName": "https://uri.etsi.org/ngsi-ld/primer/productName",

        "putBackOnShelf": "https://uri.etsi.org/ngsi-ld/primer/putBackOnShelf",

        "quantity": "https://uri.etsi.org/ngsi-ld/primer/quantity",

        "relatesTo": "https://uri.etsi.org/ngsi-ld/primer/relatesTo",

        "shelfCount": "https://uri.etsi.org/ngsi-ld/primer/shelfCount",

        "size": "https://uri.etsi.org/ngsi-ld/primer/size",

        "stockCount": "https://uri.etsi.org/ngsi-ld/primer/stockCount",

        "storeName": "https://uri.etsi.org/ngsi-ld/primer/storeName",

        "streetAddress": "https://uri.etsi.org/ngsi-ld/primer/streetAddress"

      },

      "https://roughly-cosmic-aardvark.ngrok-free.app/ngsi-ld-core-context-v1.9.jsonld"

    ]

  }

 No newline at end of file