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Understand networks

Follow what happens between pressing Send and seeing a confirmed transaction.

Outcome

Read a transaction as a sequence of authorization, validation, inclusion, and finality—not as magic.

Transactions, blocks, and finality

A blockchain is a replicated history whose participants use protocol rules to agree on valid state changes.

6 min · Reviewed Sep 2, 2026

Mining, staking, and consensus

Consensus mechanisms help distributed nodes agree on history while making dishonest behavior costly.

4 min · Reviewed Sep 2, 2026

Smart contracts, tokens, and scaling

Programmable networks can coordinate assets and applications, but code and bridges add new trust boundaries.

6 min · Reviewed Sep 2, 2026

Put it into practice

Use the model before using money

Trace a public transaction without using a wallet How to read a block explorer without drowning in data

Chapter check

Explain the decision, not just the term.

Four questions. Answers and explanations are shown after each choice.

01What does a transaction confirmation show?

AA regulator approved the transferBThe recipient has identified youCThe transaction was included in the network's historyDThe transaction can never change on any network

02Before sending an asset, which check is most important?

AThe sending and receiving sides support the same asset on the same networkBThe two services display the same tickerCThe fee is lower than yesterdayDThe destination has used crypto before

03A withdrawal is marked complete by a service but is not visible in your wallet. What is the best first diagnostic step?

ASend it again immediatelyBAssume the asset was stolenCImport a recovery phrase into a websiteDFind the transaction hash and inspect it on the correct network explorer

04Why is a fixed rule such as “one confirmation is always final” unsafe?

AConfirmations reveal private keysBNetworks use different consensus and finality rulesCEvery confirmation charges another feeDWallets choose whether blocks exist

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© 2026 Crypto AcademyReviewed Sep 2, 2026