Quiz

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

1. When does the sequencer produce a block with transactions? Only every 60 seconds Every block_ms (default 2000 ms) when the mempool is not empty Only when Divi finds a block When 10 transactions are waiting

2. A transaction's action fails. What is the result? It is dropped from the block It is in the block with ok: false, its writes are discarded and its nonce is used Its writes stay but the nonce does not change The whole block is rejected

3. How is the state_root computed? A Merkle tree of all accounts SHA256(prev_state_root || writes_digest), a chained commitment The hash of the Divi tip A random value from the sequencer

4. Which of these may a module NOT use? ctx.height() ctx.block_time_ms() The system clock, floats or HashMap iteration order ctx.public_random()

5. Which Divi block does the MCHK checkpoint in a header point at? The Divi tip The block 6 below the Divi tip The Divi genesis block The block the user last paid in

6. If Divi RPC is unreachable when a block is made, the checkpoint is... Empty The previous checkpoint repeated The block is skipped Chosen by the player

7. How long is the MCHK wire form? 32 bytes 41 bytes 77 bytes 80 bytes

8. What does a DGCH anchor contain? Every transaction of the last 300 blocks "DGCH", a version byte, the height, the block hash and the state root (77 bytes) The sequencer's private key A list of player balances

9. How often is an anchor written by default? Every block Every 300 blocks Once a day Never

10. What does `divi-gamechain replay` do? Sends the last transaction again Re-executes every block from genesis and compares every state root Deletes old blocks Restarts the sequencer