Advanced

Building on Monero Quiz (Developer)

For developers building Monero integrations. If you understand the node, the wallet RPC, and the receive/send/security model, you should ace this.

Covers material from Building on Monero: Developer Integrations.

Taken 13 times so far.

Create a free account or log in to save your quiz scores and track your progress.

Which component is a headless wallet exposed as a JSON-RPC service that most server integrations (payment processors, exchanges) drive?

monero-wallet-cli wallet2 monerod monero-wallet-rpc

For a payment processor, what is the secure way to detect incoming payments without risking funds if the server is breached?

Store the spend key encrypted in an HSM the server unlocks per payment Poll the daemon's get_transaction_pool for incoming transfers Import the full seed but disable spending in the config A watch-only wallet from the address + private view key (no spend key)

How does a modern Monero payment processor tell which invoice a given payment belongs to?

It assigns each invoice a unique transaction public key to match on It matches by the sender's address, which Monero exposes to the recipient It embeds an integrated payment ID per invoice and matches on that It generates a fresh subaddress per invoice and matches by the receiving subaddress

Why must you run your OWN monerod for an integration instead of trusting a public remote node?

Remote nodes cannot return the unlocked_balance field A remote node could lie about confirmations or sync state A remote node can decrypt your incoming amounts with your view key Remote nodes silently strip the view tags from outputs

In the wallet RPC, what is the difference between balance and unlocked_balance?

unlocked_balance includes funds still sitting in the mempool balance counts all outputs, unlocked_balance excludes decoy outputs Only unlocked_balance is spendable now; received funds are locked for 10 blocks balance excludes change outputs until they confirm

Amounts in the Monero RPC are expressed in what unit?

Nanonero, where 1 XMR = 1e9 units Millinero, where 1 XMR = 1,000 units Atomic units (piconero), where 1 XMR = 1e12 Piconero expressed as a decimal string, not an integer

In the light-wallet-server (LWS) model used by MyMonero, what does the server hold and what can it NOT do?

It holds the view key to scan for incoming outputs, but cannot spend (no spend key) It holds the seed but keeps it inside a hardware enclave It holds only the public address and forwards matching outputs It holds an encrypted spend key it can only use with the user's PIN

What makes a light wallet's scan for its own outputs much faster?

Precomputed key images cached on the server View tags: a 1-byte hint that lets the scanner skip most outputs before the full check Scanning only the coinbase outputs of each block An index of subaddresses kept by the daemon

Which wallet-rpc method moves an ENTIRE balance (e.g. sweeping deposits to cold storage or a full withdrawal)?

relay_tx sweep_all create_address get_balance

Q10

Which production practice prevents a chain reorg from causing an incorrect credit?

Credit once the tx leaves the mempool into a block template Require enough confirmations and handle a tx un-confirming after a reorg Credit at 1 confirmation, since Monero reorgs are impossible Rely on the 10-block spend lock alone as your confirmation count

🎓 Graduate from Monero Academy

Create a free account, ace every quiz across all courses, and earn your place on the Graduates wall — with your own Monero address for donations. An account also tracks your progress through the courses, and graduating is the prize for finishing.

Create free account How it works