IGCSE Computer Science Paper 1 Crossword: 5.2 Digital Currency (Modules 510–519)
Name:
Date:
Class:
✎
Crossword
Read each clue and write the matching term in the grid. Numbers in brackets show the letters in each word.
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2
3
4
5
6
7
8
9
10
Across
- 1. A group of transaction records saved together with a time-stamp as one unit of the blockchain. When a ______ is full it is closed, and new transactions go into a new ______. (5)
- 4. A digital ledger: a time-stamped series of records, in order, that cannot be altered. (10)
- 5. One entry in a ledger that states who sent the money (sender), who received it (receiver) and how much was sent (amount). Each transaction gets its own ______. Word 2 of: ______ ______ (6)
- 7. Word 3 of the term in 6 Down: _____ of ______ (6)
- 9. Cannot be changed or deleted once added. A blockchain record stays fixed, so mistakes are fixed by adding a new record and the history stays permanent. (9)
- 10. The order a payment follows: the sender makes it, it is time-stamped, placed in a block, and the block joins the chain, so the record becomes permanent. Word 1 of: ___________ -> time-_____ -> _____ -> _____ (11)
Down
- 2. A ______ stored electronically instead of on paper. Records are kept as data on computers, so they are easy to search and copy. ______ currency uses one to track who owns what. Word 2 of: _______ ______ (6)
- 3. Word 1 of the term in 2 Down: _______ ______ (7)
- 6. ______ are added one after another in time order. Each new block goes on the end and links to the block before it, so the ______ form a ______. Word 1 of: _____ of ______ (5)
- 8. The date and time added to a record when it is created, showing when it was made. It puts records in order and shows which happened first. Word 2 of: time-_____ (5)
Answer Key
IGCSE Computer Science Paper 1 · Modules 510–519
1B
2L
O
C
K
3D
E
4B
L
O
C
K
C
H
A
I
N
5R
E
6C
O
R
D
G
H
G
7B
L
O
C
K
8S
9I
M
M
U
T
A
B
L
E
T
T
I
R
10T
R
A
N
S
A
C
T
I
O
N
M
L
P
Across
1BLOCK — A group of transaction records saved together with a time-stamp as one unit of the blockchain. When a ______ is full it is closed, and new transactions go into a new ______.
4BLOCKCHAIN — A digital ledger: a time-stamped series of records, in order, that cannot be altered.
5RECORD — One entry in a ledger that states who sent the money (sender), who received it (receiver) and how much was sent (amount). Each transaction gets its own ______. Word 2 of: ______ ______
7BLOCKS — Word 3 of the term in 6 Down: _____ of ______
9IMMUTABLE — Cannot be changed or deleted once added. A blockchain record stays fixed, so mistakes are fixed by adding a new record and the history stays permanent.
10TRANSACTION — The order a payment follows: the sender makes it, it is time-stamped, placed in a block, and the block joins the chain, so the record becomes permanent. Word 1 of: ___________ -> time-_____ -> _____ -> _____
Down
2LEDGER — A ______ stored electronically instead of on paper. Records are kept as data on computers, so they are easy to search and copy. ______ currency uses one to track who owns what. Word 2 of: _______ ______
3DIGITAL — Word 1 of the term in 2 Down: _______ ______
6CHAIN — ______ are added one after another in time order. Each new block goes on the end and links to the block before it, so the ______ form a ______. Word 1 of: _____ of ______
8STAMP — The date and time added to a record when it is created, showing when it was made. It puts records in order and shows which happened first. Word 2 of: time-_____