Here are the slides of the talk I gave at Deezer France for the ParisJS #40.

1. BITCOIN & JAVASCRIPT
Build decentralized systems with JavaScript

2. 1 INTRODUCTION

3. 1
INTRODUCTION
INTERNET BLOCKCHAIN

4. 1
INTRODUCTION
INTERNET BLOCKCHAIN
Web
Mail
Torrent
FTP ...
Bitcoin
???

5. 1
INTRODUCTION
The blockchain is a technology that lets us build
decentralized systems.

6. 2 BLOCKCHAIN

7. 1
BLOCKCHAIN
The block chain provides Bitcoin’s public ledger, an ordered and timestamped
record of transactions.

8. 3 WALLETS

9. 1
WALLETS
PUBLIC KEY PRIVATE KEY
• Used to receive money
• Share it with anyone
• Used to send money
• NEVER share it
• Hide it like a motherfucker

10. TRANSACTIONS 4

11. 1
TRANSACTIONS

12. 1
TRANSACTIONS
Coins never moves

13. 1
TRANSACTIONS
1. You prove that you can
resolve the challenge.
2. You set the next challenge
to resolve to prove you can
spend the coins.
You can think of any challenge you like (Ethereum)

14. 1
Euuh…
T’as oublié qu’on était au ParisJS ?

15. LIVE CODING 5

16. 1
LIVE CODING
NODE JS
• Create a user wallet
• Make a bitcoin deposit
• Get the user balance

17. 1
PROBLEM
Centralization and single point of failure

18. 1
SOLUTION
JavaScript,
Moves the logic from the server to the browser

19. 1
LIVE CODING
BROWSER
• Get the funds back

20. QUESTIONS?
@gmajoulet