Build a Verifiable Credential Ledger

Most blockchain courses stop at theory. This one is a build. Across six stages you write working code in the page, get it checked instantly, then submit the stage deliverable for marking. The finished system is a verifiable credential ledger: an organisation issues a credential, the holder keeps it, anyone can check it is genuine and has not been revoked. The project output is owned by Mai Studies and may be licensed or sold; you keep the right to show your own work in your portfolio.

12 weeks 90 guided hours Advanced

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No account needed to buy. Pay with your card and we create your student account from the email you enter, with this programme ready inside it for twelve months.

Build a Verifiable Credential Ledger course artwork

What you will achieve

Write and test the hashing, block and chain-validation code for a ledger
Issue and verify signed credentials against a published schema
Design revocation that works without leaking holder identity
Anchor a ledger state root and prove a credential without revealing the rest
Ship a verifier page that a third party can use with no account

Entry guidance

— Comfortable writing JavaScript functions
— Any prior programming course, or equivalent self-taught experience
— Around seven hours a week for twelve weeks

Original Mai Studies learning material. This is a professional completion programme, not a regulated qualification or university accreditation.

Programme syllabus

7 applied modules

Lessons: 13
Assessed tasks: 7
Practice questions: 138
Timed mock papers: 4

Stage 1: Blocks, hashing and the fingerprint rule

Write the fingerprint function every later stage depends on.

2 lessons · 20 practice questions · 1 assessed task

1. Blocks, hashing and the fingerprint rule — notes35 min study · 3 learning objectives · practical activity
Write the fingerprint function every later stage depends on.
2. Blocks, hashing and the fingerprint rule — build it36 min study · 3 learning objectives · practical activity
Build the fingerprint function and prove three things about it: it is deterministic, it is sensitive to every field, and it covers the previous fingerprint so blocks cannot be reordered.

Stage 1 deliverable: Blocks, hashing and the fingerprint rule — marked out of 100, pass at 80%

Stage 2: Chain rules and agreeing on one history

Validate a chain and decide which competing history wins.

2 lessons · 20 practice questions · 1 assessed task

1. Chain rules and agreeing on one history — notes37 min study · 3 learning objectives · practical activity
Validate a chain and decide which competing history wins.
2. Chain rules and agreeing on one history — build it36 min study · 3 learning objectives · practical activity
Write isValidChain and a resolve function that takes two chains and returns the one your rules accept, then record the failure cases you can think of.

Stage 2 deliverable: Chain rules and agreeing on one history — marked out of 100, pass at 80%

Stage 3: Issuing a signed credential

Define a credential schema and sign it with a key pair.

2 lessons · 20 practice questions · 1 assessed task

1. Issuing a signed credential — notes35 min study · 3 learning objectives · practical activity
Define a credential schema and sign it with a key pair.
2. Issuing a signed credential — build it35 min study · 3 learning objectives · practical activity
Write the canonical form function and an issue function that produces a credential object with a signature field, then list every field you deliberately kept off the ledger and why.

Stage 3 deliverable: Issuing a signed credential — marked out of 100, pass at 80%

Stage 4: Revocation without leaking the holder

Build a status list that answers "still valid?" without naming anyone.

2 lessons · 20 practice questions · 1 assessed task

1. Revocation without leaking the holder — notes35 min study · 3 learning objectives · practical activity
Build a status list that answers "still valid?" without naming anyone.
2. Revocation without leaking the holder — build it38 min study · 3 learning objectives · practical activity
Implement the status list, revoke one credential, and write down what an observer watching your published lists over time could still work out.

Stage 4 deliverable: Revocation without leaking the holder — marked out of 100, pass at 80%

Stage 5: Anchoring and proving one credential

Publish a single root and prove membership without revealing the rest.

2 lessons · 19 practice questions · 1 assessed task

1. Anchoring and proving one credential — notes36 min study · 3 learning objectives · practical activity
Publish a single root and prove membership without revealing the rest.
2. Anchoring and proving one credential — build it34 min study · 3 learning objectives · practical activity
Build the root and the membership proof, then write the cost comparison: anchoring every credential versus anchoring one root per batch.

Stage 5 deliverable: Anchoring and proving one credential — marked out of 100, pass at 80%

Stage 6: The verifier: proving it to a stranger

Ship the check a third party can run with no account.

2 lessons · 20 practice questions · 1 assessed task

1. The verifier: proving it to a stranger — notes39 min study · 3 learning objectives · practical activity
Ship the check a third party can run with no account.
2. The verifier: proving it to a stranger — build it35 min study · 3 learning objectives · practical activity
Assemble the full verification routine returning a verdict and a human-readable reason, then write the public-facing explanation page copy.

Stage 6 deliverable: The verifier: proving it to a stranger — marked out of 100, pass at 80%

Stage 7: Final project — ship the ledger

Bring the six stages together into one working credential ledger: issue, anchor, verify and revoke, with a written handover an assessor can follow.

1 lesson · 19 practice questions · 1 assessed task

1. Final project brief and handover37 min study · 3 learning objectives · practical activity
What a finished ledger must do, how it is judged, and how to hand it over.

Final project: a working credential ledger — marked out of 100, pass at 80%

Timed mock papers

Build a Verifiable Credential Ledger: timed mock paper 1 — 180 minutes, 30 objective questions plus written and computational tasks
Build a Verifiable Credential Ledger: timed mock paper 1 — 180 minutes, 30 objective questions plus written and computational tasks
Build a Verifiable Credential Ledger: timed mock paper 2 — 180 minutes, 30 objective questions plus written and computational tasks
Build a Verifiable Credential Ledger: timed mock paper 2 — 180 minutes, 30 objective questions plus written and computational tasks

Lesson pages, assessed tasks and mock papers open the moment you join this programme. Teaching material is studied online; the notes you write are yours to download.

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