Proposal: Phase 4 — The Verifiable Student

1. Vision: From a Private Portfolio to a Verifiable Record

Phase 2 of this project gave students a tool for private, self-sovereign storage. Phase 4 will give them a tool for public, verifiable achievement.

The goal is to integrate the concepts of Decentralized Identifiers (DIDs) and Verifiable Credentials (VCs) directly into the student portfolio workflow. This will transform the system from a simple storage locker into a true lifelong learning and career passport. When this phase is complete, a student will not only be able to store their work on IPFS but also to hold a cryptographically signed "attestation" from their institution about that work (e.g., a grade, a skill badge, or a formal credit).

2. Proposed Features

This phase will introduce two core components:

A. The "Institutional Issuer" Endpoint

We will create a new, secure API endpoint, /issue-credential.
This endpoint will be used by the institution (e.g., a teacher or administrator).
It will accept a student's DID, the IPFS CID of a piece of student work, and a set of claims (e.g., grade: "A", skill: "Critical Thinking").
The endpoint will then generate a W3C-compliant Verifiable Credential, sign it with the institution's private key (held on the server), and return the VC to the issuer, who can then transmit it to the student.

B. The Student Wallet and Verifier UI

We will enhance the portfolio.html page to act as a rudimentary digital wallet.
Students will be able to upload and store the VCs they receive from their school.
We will add a "Share Proof" feature. This will allow a student to generate a Verifiable Presentation, which is a package containing their DID, the original credential, and a link to the work on IPFS.
We will create a simple, public-facing "Verifier" page. Anyone (e.g., an employer) with a link to a Verifiable Presentation can visit this page, and it will automatically verify the cryptographic signatures and confirm that the student's credential is authentic.

3. Technical Stack

DIDs: We will use the did:key method for simplicity in this proof-of-concept. This method is easy to generate and requires no blockchain interaction.
VCs: We will use a standard JavaScript library (e.g., veramo or a similar W3C VC-JWT library) on the server to create and sign the JSON Web Token (JWT)-based credentials.
Cryptography: The server will hold a private key for signing credentials. The verification process on the public page will use the corresponding public key.

4. User Flow

Student: A student uploads an essay using the existing client-side encryption feature and gets an IPFS CID. They generate a did:key in their portfolio and share it and the CID with their teacher.
Teacher: The teacher grades the essay. They access an internal school dashboard and use the /issue-credential endpoint, providing the student's DID, the essay's CID, and the grade.
Student: The student receives the signed VC from their teacher and adds it to their portfolio "wallet."
Student (later): The student applies for a job. They use the "Share Proof" feature to generate a single URL.
Employer: The employer clicks the URL, which opens the Verifier page. The page automatically fetches the data, verifies the signatures, and displays a confirmation: "✓ This credential is authentic and was issued by [School Name]."