What Is Blockchain?

How a bank transaction could fail?

• Bad weather

• Transfer limits

• Account Hacked

• It's a public holiday

Because of blockchain,cryptocurrencies ____________

• are free

• are immune to counterfeiting

• don't require a central authority

• are protected by strong and complex encryption algorithms

A hacker will not be able to alter the data in the blockchain because ______

• each user has a copy of the ledger

• the hacker is good at hacking

• the hacker works for China

• the data within the blocks are encrypted with by complex algorithms

Blockchain can be described as______

• collection of records

• linked with each other

• strongly resistant to alternation

• protected using cryptography

How blockchain helped Walmart?

• Helping Walmart to identify the problem areas and fixing them

• Helping Walmart to make more money

• Create more Walmart chains

• Pay less taxes