How can you check whether money is genuine?
Correct answer
Answer C: By checking verifiable authenticity features.
Quick explanation
Verifiable means that authenticity and validity can be checked. For coins, features such as weight, size and design can help. Checking gold is more difficult and may require special tests or expertise. In Bitcoin, full nodes follow set rules to check whether transactions are valid.
Detailed explanation
For everyday money, it is useful if one valid unit has the same face value as another unit of the same size. A ten-euro note should generally be interchangeable with another genuine ten-euro note. This property is called fungibility. It avoids having to reassess every unit's individual history with each payment.
Verifiability complements this property. Users must be able to determine with reasonable effort whether banknotes, coins or digital units are genuine and valid. Security features help with cash. In digital systems, technical and institutional verification rules perform this task.
In practice, fungibility can have limitations. Damaged banknotes, legal restrictions or publicly traceable transaction histories can cause units to be treated differently. The resulting ideal is that valid units of the same size should be as equally usable as possible, while counterfeits or invalid units are reliably detected.
Example or everyday application
A coin's size, weight and minting can offer clues to its authenticity. In Bitcoin, a full node checks whether a block and its transactions are valid under its rules. The methods differ, but each provides a form of verification.
Common misconception
A convincing appearance is not proof of authenticity. A displayed balance or a professional-looking website is no substitute for appropriate verification either.
What the sources support
The ECB shows how cash is checked for authenticity using security features, while the Royal Mint describes checks for gold. Bitcoin documentation shows the digital counterpart: full nodes validate transactions and blocks against consensus rules, while proof of work makes confirmed history harder to rewrite.