Lab session curriculum

Browser wallets, demystified across four chains.

A single lab that walks students through connecting, signing, and transacting with wallets on EVM, Solana, Bitcoin, and Dogecoin — then ends with deploying and testing their own staking contract on Base Sepolia.

Open Staking Lab →Learn Gas Fees Download SimpleStaking.sol

EVM — Ethereum & L2s

evm

Ethereum, Base, Arbitrum, Optimism, Polygon, BNB…

MetaMaskRabbyCoinbase WalletTrust WalletWalletConnect

Keys: secp256k1 private key → keccak256(pubkey)[12:] → 20-byte address
Address: 0x-prefixed 20-byte hex, EIP-55 checksummed
Signing: personal_sign, eth_signTypedData_v4 (EIP-712), eth_sendTransaction
Injected API: window.ethereum (EIP-1193). Discover via EIP-6963 for multi-wallet.

Lab session steps ↓

Install MetaMask & create a fresh seed phrase. Discuss BIP-39 word entropy.
Add the Base Sepolia network (chainId 84532, RPC https://sepolia.base.org).
Fund the account from a Base Sepolia faucet.
Sign a plain message vs an EIP-712 typed message — inspect the payloads.
Send a native tx and read the receipt with a block explorer.
Connect the wallet to a dApp via window.ethereum and read chainId + accounts.

Verify your connection

Checking for a wallet…

Detect injected provider — not run
Authorize accounts — not run
Read chain / network — not run
Sign a test message — not run

0/4 checks passed.

SVM — Solana

svm

Solana mainnet, devnet, testnet

PhantomSolflareBackpackGlow

Keys: ed25519 keypair — public key IS the address (32 bytes)
Address: Base58-encoded 32-byte public key (no prefix, ~44 chars)
Signing: signMessage, signTransaction, signAllTransactions (versioned tx v0)
Injected API: window.solana / Wallet Standard (window.navigator.wallets)

Lab session steps ↓

Install Phantom, switch cluster to Devnet in settings.
Airdrop SOL via `solana airdrop` or Phantom's faucet button.
Compare an EVM 20-byte address to a Solana 32-byte base58 pubkey.
Sign a message — note that Solana returns a raw ed25519 signature, not RSV.
Send a SOL transfer and inspect the tx on Solana Explorer (devnet).
Discuss rent, program-derived addresses, and account model vs. EVM state.

Verify your connection

Checking for a wallet…

Detect Solana provider — not run
Connect wallet — not run
Read cluster endpoint — not run
Sign a test message — not run

0/4 checks passed.

BTC — Bitcoin

btc

Bitcoin mainnet, testnet3, signet

XverseUnisatLeather (Hiro)OKX Wallet

Keys: secp256k1 → HASH160(pubkey) for legacy/segwit; x-only pubkey for taproot
Address: P2PKH (1…), P2SH (3…), Bech32 SegWit (bc1q…), Bech32m Taproot (bc1p…)
Signing: signMessage (BIP-322), signPsbt — PSBTs describe UTXO inputs/outputs
Injected API: window.unisat / window.XverseProviders / window.btc (per-wallet, no EIP-1193)

Lab session steps ↓

Install Unisat or Xverse, switch to Bitcoin Testnet.
Get tBTC from a signet/testnet faucet. Show the address types side-by-side.
Explain UTXO model — no balances, just spent/unspent outputs.
Sign a BIP-322 message and verify it off-chain.
Craft a PSBT with 1-in-1-out and let the wallet sign & broadcast it.
Bonus: mint an Ordinal inscription on signet and view it on ord.io.

Verify your connection

Checking for a wallet…

Detect Bitcoin provider — not run
Request accounts — not run
Read network — not run
Sign a BIP-322 message — not run

0/4 checks passed.

DOGE — Dogecoin

doge

Dogecoin mainnet & testnet (a Bitcoin fork)

MyDoge WalletCtrl (formerly XDEFI)OKX Wallet

Keys: secp256k1, same derivation as Bitcoin — different network params
Address: P2PKH starts with D…, P2SH starts with A…, testnet uses n… / 2…
Signing: signMessage, signPsbt — bitcoin-compatible tooling with Doge params
Injected API: window.doge / MyDoge SDK — no unified standard yet

Lab session steps ↓

Install MyDoge Wallet extension, switch to testnet.
Compare a Doge address (D…) with a BTC address — same crypto, different prefix byte.
Get testnet Doge from a faucet, send between two student wallets.
Broadcast a tx with an OP_RETURN memo and inspect on a Doge explorer.
Discussion: why UTXO forks share tooling, and Dogecoin's inflation vs BTC's cap.

Verify your connection

Checking for a wallet…

Detect Dogecoin provider — not run
Connect wallet — not run
Read network — not run
Sign a test message — not run

0/4 checks passed.

Capstone lab

Deploy your own staking contract on Base Sepolia

Download SimpleStaking.sol, compile it in Remix or Hardhat, deploy to Base Sepolia, then paste your contract address into the Staking Lab to stake, view rewards, and unstake — right from your browser wallet.

Download .sol file Download ABI Go to Staking Lab