Quiz

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Pick the right answer for each question (tick all that apply where boxes are shown). Pass mark 80%.

1. What identifies an account on the Divi Games side-chain? A username and password A Divi P2PKH address A Telegram id An email address

2. Which version byte do Divi testnet addresses use? 30 111 139 0

3. How is a P2PKH address derived from a compressed public key? base58check(version || RIPEMD160(SHA256(pubkey))) hex(SHA256(pubkey)) base64(pubkey) base58check(version || private key)

4. Why can nobody sign as `module:tictactoe`? Its key is stored in the sequencer It is not a valid base58 address, so no key exists for it; only the module's code moves its funds Signatures from modules are rejected after 150 blocks It only holds testnet DIVI

5. What does a Divi signed message prepend before hashing? Nothing The chain id varstr("DarkNet Signed Message:\n") before the message The signer's address

6. How does the node check a signature? It looks the public key up in a registry It asks the wallet to confirm It recovers the public key from the hash and signature and compares its address with `from` It re-serialises the JSON and compares hashes

7. What exactly does the signature of a transaction cover? A canonical re-serialisation of the body The exact body text, byte for byte Only the action field The txid

8. A transaction has a valid signature and nonce, but its action is an illegal move. What happens? It never enters the mempool It is included in a block with a failed receipt and uses up its nonce It is included and the move is applied anyway The sequencer is penalised

9. How is a txid computed? hex(SHA256(body bytes)) base64(signature) RIPEMD160 of the address The block height followed by the index

10. Which tokens does Divi Games use? Real-value DIVI that can be cashed out Testnet tokens only, with no cash-out Any ERC-20 token Only mainnet DIVI