# 206.6 Lesson - satoshisBreakthrough

**Screen:** satoshisBreakthrough

**Headline:** Satoshi's Breakthrough

**Reward:** 3

**Text:** Satoshi's solution to the double spending problem was a breakthrough in computer science and distributed systems. Until Bitcoin, many believed that it would be unsolvable.

His solution allowed Satoshi to develop a new electronic cash system that for the first time made it possible for people to send digital money directly to each other, without needing a bank or other organization to help.

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## QUIZ

**Question:** Which problem did Satoshi have to solve to create Bitcoin?

**Answer:** The double spending problem

**Feedback:** Good job. Bitcoin uses a proof-of-work consensus mechanism where transactions are batched into blocks and chained together to a blockchain. This way, every user knows that every coin is only spent once

**Correct:** true

**Answer:** The problem of double coincidence of wants

**Feedback:** Not quite. The double coincidence of wants is a problem of barter that can be solved with money. Try again

**Correct:** false

**Answer:** The halving problem

**Feedback:** Hah no. The halving in bitcoin is not a problem, but part of the solution that Satoshi designed! More on that in Chapter 302. Try again!

**Correct:** false

<figure><img src="/files/QxC6WE6FuNUQNsz26DFS" alt=""><figcaption></figcaption></figure>


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