Blocks in a blockchain are linked to each other ____
A. Sideways
B. Forward
C. Upwards
D. Backward
Answer:D
Blocks in a blockchain are linked to each other ____
A. Sideways B. Forward C. Upwards D. Backward
Explanation: Blocks in a blockchain are linked to each other backwards to the previous block. The current block links to the previous block(backward) by storing the hash of the previous block. In this case, if a transaction in the previous block changes, so does the hash, the current block will now have a different hash from the one it had meaning it will deem the previous block invalid.