Proof of Learning

This demonstrates the wallet half of Sign-In with Ethereum: request the public address, build an EIP-4361 style message, and ask the wallet to sign it. A real deployment verifies the signature server-side before treating it as a full login.

Ready. If no browser wallet is installed, this step will explain that honestly and stay usable.

Connected address

Not signed in

Sepolia network state

Not checked yet

Signed message and signature

No signed credential yet.

Verify a live chain read

This static page can read Sepolia without a wallet. It sends raw JSON-RPC eth_call requests to a public Sepolia endpoint, decodes the returned hex words directly, and shows the request and response.

Ready to read Chainlink ETH/USD on Sepolia through public RPC.

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Raw RPC request and response

No RPC call yet.

Learn the idea before proving it

The goal is not hype. The goal is to understand why a program might use wallet login and public completion records when learners want outcomes that can be checked later.

What is a smart contract?

A smart contract is code deployed to a blockchain. People and apps can call its public functions, and the chain records what happened according to that code.

Why are records verifiable?

Once a transaction is confirmed, anyone can independently read the chain state. A program cannot quietly edit a public on-chain completion record the same way it might edit a private spreadsheet.

What does testnet mean?

Sepolia is an Ethereum test network. It is used for learning and testing. This page is testnet-only: no mainnet, no real money, and nothing to buy.

1. What does this page prove during wallet sign-in? That a full production login system has already verified the learner. That the wallet can provide an address and sign a message; a real app would verify that signature server-side. That a learner needs an email and password to use the app.

2. Why put proof-of-completion on-chain? So the record can be publicly checked later and is hard to quietly alter. So learners receive a financial return. So private keys can be stored by the school.

3. What network does this page use? Ethereum mainnet. Ethereum Sepolia testnet only. A private database pretending to be a chain.

Prove completion on-chain

After signing in, a learner can call attest() on a Proof of Learning contract deployed to Sepolia. Then this page reads total() to show the public attestation count. If no contract address is configured, this section will say so and will not invent a transaction or count.

Proof contract not yet configured. Set the contract address constant in the script to enable this step.

Proof contract

Not configured

Public total attestations

Not read

Last transaction hash

None

Your attestation timestamp