Predict, reveal, recalibrate
Blockchain learning loops
Short prediction drills that force the mental model before the explanation. Use them between lessons or before practice sessions.
Network Intuition
Which transactions enter the next block?
A miner sees more pending transactions than fit in one block. Which transactions are most likely to be selected first?
Attack Model
What gets harder after more confirmations?
A payment has one confirmation, then six confirmations. What changes about a double-spend attempt?
Wallet Safety
What does a signature actually authorize?
A wallet signs a transaction spending 1 BTC to Alice. Can an attacker copy that signature and redirect the payment to Bob?
Security Reflex
Which line should happen before an external call?
A contract owes a user a withdrawal. It can either update the user's balance first or send ETH first. Which is safer?