Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Describe what are the features that makes blockchain technology secure.

### Response:
Blockchain technology is secure because it is immutable, meaning the data stored in it can't be changed once it is recorded; transparent, meaning all parties involved are able to view the transaction data; distributed, meaning the data is not concentrated in one place; and protected, meaning it is encrypted with strong cryptography.