Blockchain Unraveled: advantages and disadvantages of a decentralized world

10 years ago, blockchain technology emerged as a revolutionary solution, helping us to create a more transparent, safer, and significantly cheaper development process. However, entering the industry is still a somewhat complex endeavor. In this talk, we will delve into this new industry that has actively embraced decentralization, investigate their motivations and methods for doing so, and analyze the advantages and disadvantages of a decentralized world. We will explore the challenges newcomers face in the blockchain space. We will discuss the innovative solutions being developed to lower the barriers to entry and make blockchain technology more accessible to all.

1. Blockchain Unraveled
by Vasilika Klimova

2. ® Hello World

+ 14+ years Software Engineer

« Fullstack, Frontend, 3D, Blockchain
+ Google Developer Expert in Web

+ Women Techmakers Ambassador
« Developer Relations Engineer

3. What do you think about blockchain?

4. Agenda

- Concept
« Obstacles
- Use cases

5. Blockchain Unraveled
by Vasilika Klimova

6. ® The Net

7. @ The Net

8. Decentralization

- Nodes
+ Rules
- Resources

9. Blockchain vs Database

Name Type Collation Attributes Null Default Comments. Extra
N AUTO_INCREMENT] #

EmplD ¿>
Name ) latin
3 Address (100) latint_s
Mobile Number (10) latin4

5 Gender Iatin!

+ X Delete
- X Edit
« New record for changes

10. Blockchain Evolution

Immutable
digital
record

of SEE EE.

12. Transparency

- All users can see blocks
- Audit trail
- Only authorised parties can interact

13. a
5
[e]
EN
[a]
[2]
[=]
<

en

op

ns,

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14. =>

N
Me
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Wi

16. - Link of prev block à.
- Timestamp
- Code inside block

17. eo SHA256-0 x CE

Secure <> oa

emni78.gith.. À & &

SHA256
This SHA256 online tool helps you calculate hash from string or binary.
You can input UTF-8, UTF-16, Hex to SHA256. It also supports HMAC.

Input

sone data

Output

1307990e6ba5cal45eb35e99182a9bec46531bc54ddf656a602c780fa
0240dee

18. eo SHA256-0 x CE

Secure <> oa

emni78.gith.. À & &

SHA256
This SHA256 online tool helps you calculate hash from string or binary.
You can input UTF-8, UTF-16, Hex to SHA256. It also supports HMAC.

Input

sone data

Output

1307990e6ba5cal45eb35e99182a9bec46531bc54ddf656a602c780fa
0240dee

19. Blockchain Evolution

Immutable
digital
record
1990 2000 |
Crypthographic

secure
chains

20. Consensus

Complex calculations
FIFO

Proof of Work

EVSA

1268 GDRs

21. Blockchain Evolution

Immutable
digital Proof of Work
record
1990 2000 2004 |
Crypthographic

secure
chains

22. Block generation

+ Calculations
+ Complexity
+ Verification

23. Blockchain Unraveled
by Vasilika Klimova

24. A Peer-to-Peer
Electronic Cash System

- Currency

- Digital

+ Decentralized

« No need for intermediaries
+ Transparent

+ Secure

+ Immutable ledger

25. Blockchain Evolution

Immutable
digital Proof of Work
record
1990 2000 2004 | 2008
Crypthographic

Satoshi
secure

chains

28. Blockchain Evolution

Immutable
digital Proof of Work NFT
record
1990 2000 2004 | 2008 2014
Crypthographic

Satoshi
secure

chains

29. Smart Contracts

Smart contracts automate and execute
predefined actions based on agreed-upon
terms, enhancing trust and efficiency in
business agreements.

Ethereum

30. Smart Contracts

Smart contracts automate and execute
predefined actions based on agreed-upon
terms, enhancing trust and efficiency in
business agreements.

Solidity

Ethereum

31. Blockchain Evolution

Immutable
digital Proof of Work NFT
record
1990 2000 2004 2008 2014 2015
Crypthographic

Satoshi Ethereum
secure

chains

32. , Concept

33. ¿0

D

@ Concept

m? 7

34. @ concept a Off-chain

© Private Data

35. Private Blockchains

¿> Quorum

36. How doesa

Smart Contract Work?

v RT
BE à — %—
v a

Identify Agreement Set conditions Code business logic
Multiple parties identify ‘Smart contracts are A computer program
and desired outcomes. when certain conditions

are met

ll
i
i
I
1
i
the cooperative opportunity ‘executed automatically Is written |
i
i
1
i
1

NT E era

Network updates Execution and processing

Encryption and blockchain
technology

All the nodes on the The code Is executed and Encryption provides a secure
network update thelr ledger. ‘outcomes are memortallzed. transfer of messages between parties.

37. How does a Smart Contract work?

- Identify agreement
+ Set conditions

- Business logic

+ Encrypt

« Execute

- Network update

38. How does a Smart Contract work?

- Identify agreement
+ Set conditions

- Business logic

+ Encrypt

« Execute

- Network update

39. How does a Smart Contract work?

- Identify agreement
+ Set conditions

- Business logic

+ Encrypt

« Execute

- Network update

40. How does a Smart Contract work?

- Identify agreement
+ Set conditions

- Business logic

+ Encrypt

« Execute

- Network update

41. Blockchain Unraveled
by Vasilika Klimova

42. ® Obstacles NFT

Gas
N
Fungible tokens DL Web3
Proof of Stake DeFi
Stable coins VG a? dApp
i y
y

Swap | Bridge

ZK

43. Technical Knowledge Requirements

- Backend

- Frontend

- Crypthography

- Finance principles
- Security breaches

- Last trends in Web3

44. Your Seed Phrase

"User-Friendly" Interfaces

1. issue 2. flame 3. sample

+» UX
+ Storing private keys 4. lyrics 5. find 6. vault

7. announce 8. banner 9. cute

10. damage 11. civil 12. goat

[This is your private key (click to copy)

f9600b954df8b687cdc4cb377244

a458429b3c09602d571872b7b980

30felf47 I understand that if | lose my seed

J phrase that | will not be able to recover
my account.

Anyone with
your private keys can steal any assets held in
your account.

45. Regulatory Uncertainties

**

*
* General
Data
x a X protection
x * Regulation
Kur

*

atlanticcouncil. org

46. Crypto
Regulation
2024

In 2024 the global regulatory environment for crypto is
‘evolving api. with key dimensions incueing
‘government regulations, AML measures, and
Institutional outiook advancing a pace,

{or erypto regulation

© switzerans (Nigeria
= eisavador Seychelles
© Japan ww russia

© Germany @ Antigua and
Barbuda

Jamaica

(France
Ae Giovatar
Lithuania

Z Argentina
Que Vietnam
aad Hor

see Pakistan

10 @ Turkey

Leon @ chine

CryptoReguiation

Coineub

47. Trust No One: The Hunt for the Crypto King

48. Social Engineering & Phishing

Crypto phishing attacks
drained nearly $300 million in

2023: Scam Sniffer

by James Hunt
SECURITY + January 3, 2024, 6:11AM EST

49. 51%

51% Attack “Worst Fears A
Reality For Ethereum
Classic”

© Ethereum Classic got hacked using a 51% attack. More than $1 million worth of
ETC stolen so far. The hack was first noticed by Coinbase and alerted the
community about detecting “a deep chain reorganization of the à Ethereum
Classic blockchain".

50. 51%

51% Attack “Worst Fears A
Real ity For Ethara: im

On 10th Jan, Gate.io, one of the affected exchanges found that the attacker

Classic” returned partial ETC back to Gate.io (100k USD). The company tried contacting the
attacker but didn’t get any reply.

If the attacker didn't run it for profit, he might be a white hacker who wanted
to remind people of the risks in blockchain consensus and hashing power
security.

© Ethereum Classic got hacked using ording to the statement from Gate.io published on 12th Jan
ETC stolen so far. The hack was first noticed py Goinbase ana alerted tne

community about detecting “a deep chain reorganization of the à Ethereum

Classic blockchain".

51. Blockchain Unraveled
by Vasilika Klimova

53. Intermediaries

54. Intermediaries

Notary fee
~€20.000

55. Real estate

For Agents

24/7 Real Estate
Closings

We leverage Al and blockchain technology for
smooth and secure transactions

nin | Get Started
Faw |‘ *

FMA BUYER

56. SIEMENS

FedEx.
© nestle

amazon 2422

web services

57. Financial Transactions

Blockchain facilitates secure,
decentralized financial transactions,
reducing costs and increasing
transaction speed without
intermediaries.

58. IBM Food Trust Walmart >< Global Tech

DZ

Reduce food waste Meet compliance requirements Improve supply chain efficiency
Better track both wasted and rescued food Ensure safety and regulatory compliance Run a more efficient food network by
while minimizing waste hot spots by using and avoid product recalls, helping to eliminate bottlenecks in the
key data elements. supply chain.

Focus on food waste E Focus on food safety Br on food chain efficiency E

EJ

Improve safety monitoring. Prevent food fraud >-
Increase awareness of sustainability Monitor and trace food products in the Make your supply chains less susceptible to
opportunities and practices in each step of supply chain to accurately judge remaining fraud and errors with end-to-end
the manufacturing processes of the food shelf life traceability records.

chain,

Focus on food sustainability Focus on food freshness Br Focus on food fraud Er

59. Walmart

IBM Food Trust

Reduce food waste
Better track both wasted and rescued food

Meet compliance requirements
Ensure safety and regulatory compliance

There is a better way to reduce fraud

Global Tech

DZ

Improve supply chain efficiency
Run a more efficient food network by
16 eliminate bottlenecks in the

Blockchain can enable $31 billion in food fraud

savings globally by 2024 by immutably tracking food food chain
across the supply chain, and compliance costs can

be reduced by 30%.5

ney Br

Focus on food w

Prevent food fraud
Make your supply chains less susceptible to
fraud and errors with end-to-end
traceability records.

Improve safety monitoring
Increase awareness of sustainability Monitor and trace food products in the
‘opportunities and practices in each step of supply chain to accurately judge remaining
the manufacturing processes of the food shelf life

chain,

Focus on food fraud Br

Focus on food sustainability Focus on food freshness Br

60. ste Meet compliance requirements Improve s
| wasted and rescued food Ensure safety and regulatory compliance Run a moi

Blockchain can enable $31 billion in food fraud
savings globally by 2024 by immutably tracking food

across the supply chain, and compliance costs can
be reduced by 30%.5

Bonnes €,

61. Supply Chain Management

Blockchain streamlines supply chain Fed
operations by providing real-time
visibility, traceability, and

transparency across the entire
network.

62. Loyalty

© EZRA REGUERRA AUG 31, 2023

Lufthansa airline launches NFT loyalty

program on Polygon

Airline passengers can collect NFTs and then get rewards, such as flight upgrades or airport
lounge access, after completing NFT sets.

63. Voting Systems

Featured Clients

Our platform has been used by governments and political parties to conduct
public elections in 6 countries so far.

64. Identity Verification

Civic provides tokenized identity, built for the future

CIVIC

65. Authentification

pireKey Account 1

4 Sign In conce

Use Touch ID to sign in?
A passkey for “SpireKey Account 1 (Testnet)* will be
saved in ¡Cloud Keychain and available on al your
devices.

Continue with Touch ID
Other Options

66. Agreement

ES ah 5%

Proof of Stake

67. Areas

- Art

- Retail

- Health

+ Copyright

- Trade

- Loyalty programs

- Real estate

- Insurance

- Finance operation
- Employment

- Supply chains

- Elections

- Certificates

68. 200 million

150 million

100 million

50 million

0 million

Asia

Blockchain Users In Different Regions Worldwide

Europe Africa North America South America Oceania

demandsage

69. Year

2027*

2024*

2023

2022

2021

2020

2019

2018

2017

Blockchain market size

$162.84 billion

$32.69 billion

$19.36 billion

$11.54 billion

$6.92 billion

$4.19 billion

$2.55 billion

$1.57 billion

$0.98 billion

70. Blockchain Unraveled
by Vasilika Klimova

71. Blockchain Developer Salary - Jul 2024
How much does a Blockchain Developer make?

Average Yearly Salary

The average yearly salary of a Blockchain Developer is $144k per year, with a minimum base salary
of $70k and a maximum of 254k

Blockchain Developer Salary

MI Min Avg Max

200,000

blockchain

72. Howtolearn? 4

\ ethereum.org
6% GRYPTOZOMBIES [1]
Pa

coursera

73. How to use?

bybit.com

crypto.com

gnosispay.com

74. Events

- EthCC

+ DevCon

- EthDenver
- Consensus

75. Trust, but verify!

76. ® Thanks!

Una

a
A ==,
»

g

Web

Vasilika Klimova
@Lik04ka