Blockchain Quiz – 5 winners split $150 USDT

Question: What's a Private Key actually used for?

A) Digitally sign messages/transactions
B) Lock your wallet screen
C) Search the web faster
D) Nickname for your email password

How to enter:
• Follow @Four_FORM_
• Like + RT
• Drop answer + tag 3 friends

Easy money for knowing basic crypto security. Don't fumble this.