OdessaJS 2021

1. Ethereum
smart contracts on js
Dvorovenko
Yaroslav
Summer. Sea. JavaScript.

2. Speech about cases
Not about strong theory

4. Headline

5. Headline

6. vs
Delivery price

8. Yaroslav
Dvorovenko
1. Team Lead Lohika
2. Odessa JS program
comitet team member
(last 3 years)
3. Sometime play on
crypto market
4. Will do my first swim
sprint 4 Sep on Ocean man

9. What is Blockchain?

10. It’s a type of digital currency, the accounting of internal accounting units of which is
provided by a decentralized payment system, operating in a fully automatic mode.
What is cryptocurrency?

11. Cryptocurrency and platform that provides a
possibility to build decentralized services based
on blockchain that works on Smart Contracts:
What is Ethereum?
- 2 largest capitalization in crypto-world
($379,359,819,599)
- Smart contracts use Solidity (Looks like
Typescript)
- Actively developing
- Open source

12. A smart contract is a computer program that is intended to
automatically execute, control, or document legally relevant
events and actions
- Automatically execute
- No need for any proxies
- Safe and confidential
- No need any paper
What is Smart Contracts

13. End of theory

14. Evolution of contacts

15. Headline

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laborum.
Headline

17. Headline

18. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt
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laborum.
Headline

19. Headline

20. Headline

21. What we should solve?
- Time
- Automation
- Transparency
Issues

26. How does it work from a technical
perspective?

27. Let’s start with Web3.js

28. It makes it possible to connect to an existing
network or create a new one, view the event log in
the blockchain, transactions, etc.
- $npm install ganache --global
- $ganache-cli <args>
Or use GUI, works really perfect!
Ganache CLI

29. Truffle is the most popular development
framework for Ethereum with a mission to
make your life a whole lot easier.
- Built-in smart contract compilation,
linking, deployment and binary
management.
- Automated contract testing with Mocha
and Chai.
- Provider for Web3
- ...
Truffle

30. DApp interaction with contract

31. Smart Contract via Solidity

32. Workflow
API Web3.js SC(viaTruffle)
Blockchain
(via Ganache)
Client from
Egypt
Checkpoint

33. Let’s eat cheap
mango!

34. - Elections (easy to integrate to DIIA)
- Replacement of the national currency with
e-currency (Ukraine is one of the first who
started work on e-hryvnia)
- Transfer of any amount of money with a
minimum commission instantly (this is what
paypal does)
Where we can use smart contracts?

35. Contacts
Linkedin: in/yaroslav-dvorovenko
Telegram: @dvorovenko

36. Thank You
for Your attention!
Link 1
Link 2
Link 3
Link N
Phone number: +38 099 888 77 66