Computer Science · Oct / Nov 2024 · Paper 11 · Question 8
0478
As printed in the paper
The question as text
Draw and annotate a diagram to show how a payment transaction is made using digital currency and blockchain. [4]
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
One mark for each correct part.
The diagram shows:
Digital ledger is used
Device encrypting data
Device sending data to digital ledger
Payment being recorded on digital ledger
… including details such as digital signature/time/date stamp
Transaction is stored in a block …
… in multiples
Each block has block hash/unique identifier
When block is executed or full
… it is applied to every device that has the blockchain // Block is added to blockchain (on each device)
For example:
Transaction is
stored in a block
Block hash
Digital ledger
Block
When block is full,
Payment
it is added to the
data sent
blockchain
Customer’s
device
Device
encrypts
Blockchain
payment data
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