An Example of LDP for PFPS

This is an artisanal example of Linked Data Proofs for PFPS.

Quickstart

npm i
node index.js

Usage

To sign a Linked Data document in a way consistent with https://w3c-ccg.github.io/ld-proofs/#proof-algorithm do the following:

1. Modify unsignedData in index.js to be a valid JSON-LD document ensuring the @context is valid for the data being signed (e.g., all terms defined).
2. If you want to modify the signing key, modify mockKeyPair2020 in mock-data.js.
3. Set controller in mock-data.js to a URI that identifies the controller (aka owner) of the key material.
4. Set suite.date to a valid ISO8601 datetime.

To verify, pass the signedData to jsigs.verify and print the result, which will contain a variety of verified information.

Example Output

-------------- UNSIGNED DATA ---------------
{
  "@context": {
    "title": "https://schema.org#title"
  },
  "title": "Hello world!"
}

-------------- NQUADS ---------------
_:b0 <https://schema.org#title> "Hello world!" .

-------------- CANONICALIZED NQUADS ---------------
_:c14n0 <https://schema.org#title> "Hello world!" .

-------------- SIGN ---------------
{
  "@context": [
    {
      "title": "https://schema.org#title"
    },
    "https://w3id.org/security/suites/ed25519-2020/v1"
  ],
  "title": "Hello world!",
  "proof": {
    "type": "Ed25519Signature2020",
    "created": "2021-05-29T19:23:24Z",
    "verificationMethod": "https://pfps.example/issuer#z6MkjLrk3gKS2nnkeWcmcxiZPGskmesDpuwRBorgHxUXfxnG",
    "proofPurpose": "assertionMethod",
    "proofValue": "z4oey5q2M3XKaxup3tmzN4DRFTLVqpLMweBrSxMY2xHX5XTYVQeVbY8nQAVHMrXFkXJpmEcqdoDwLWxaqA3Q1geV6"
  }
}

-------------- CANONICALIZED SIGNED NQUADS ---------------
_:c14n0 <http://purl.org/dc/terms/created> "2021-05-29T19:23:24Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> _:c14n2 .
_:c14n0 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <https://w3id.org/security#Ed25519Signature2020> _:c14n2 .
_:c14n0 <https://w3id.org/security#proofPurpose> <https://w3id.org/security#assertionMethod> _:c14n2 .
_:c14n0 <https://w3id.org/security#proofValue> "z4oey5q2M3XKaxup3tmzN4DRFTLVqpLMweBrSxMY2xHX5XTYVQeVbY8nQAVHMrXFkXJpmEcqdoDwLWxaqA3Q1geV6"^^<https://w3id.org/security#multibase> _:c14n2 .
_:c14n0 <https://w3id.org/security#verificationMethod> <https://pfps.example/issuer#z6MkjLrk3gKS2nnkeWcmcxiZPGskmesDpuwRBorgHxUXfxnG> _:c14n2 .
_:c14n1 <https://schema.org#title> "Hello world!" .
_:c14n1 <https://w3id.org/security#proof> _:c14n2 .

-------------- VERIFY ---------------
{
  "verified": true,
  "results": [
    {
      "proof": {
        "@context": [
          {
            "title": "https://schema.org#title"
          },
          "https://w3id.org/security/suites/ed25519-2020/v1"
        ],
        "type": "Ed25519Signature2020",
        "created": "2021-05-29T19:23:24Z",
        "verificationMethod": "https://pfps.example/issuer#z6MkjLrk3gKS2nnkeWcmcxiZPGskmesDpuwRBorgHxUXfxnG",
        "proofPurpose": "assertionMethod",
        "proofValue": "z4oey5q2M3XKaxup3tmzN4DRFTLVqpLMweBrSxMY2xHX5XTYVQeVbY8nQAVHMrXFkXJpmEcqdoDwLWxaqA3Q1geV6"
      },
      "verified": true,
      "purposeResult": {
        "valid": true,
        "controller": {
          "@context": "https://w3id.org/security/v2",
          "id": "https://pfps.example/issuer",
          "assertionMethod": [
            "https://pfps.example/issuer#z6MkjLrk3gKS2nnkeWcmcxiZPGskmesDpuwRBorgHxUXfxnG"
          ]
        }
      }
    }
  ]
}