Non-fungible tokens (NFTs) are unique digital assets that are verified on a blockchain network, allowing for the creation and ownership of one-of-a-kind digital items, such as artwork, music, videos, and other types of digital content. They are important because they provide a way for digital creators to monetize their work and establish ownership, scarcity, and authenticity of their creations. NFTs have also gained popularity as a form of investment and collectible item, with some NFTs selling for millions of dollars. This slide deck includes the following sections: Introduction: Provide a brief overview of what NFTs are and their significance in the digital world. How NFTs work: Explain the process of creating and verifying NFTs on a blockchain network, including the use of smart contracts and cryptographic hashing. Types of NFTs: Describe the various types of NFTs that can be created, such as digital artwork, music, videos, and other types of digital content. Benefits of NFTs: Highlight the benefits of NFTs, including the ability to establish ownership, scarcity, and authenticity of digital assets, as well as their potential as a new source of revenue for creators. Market trends: Provide an overview of the current state of the NFT market, including recent sales and trends in various industries, such as art, sports, and gaming. Potential use cases: Discuss potential use cases for NFTs beyond the current market, such as in the areas of identity verification, supply chain management, and digital voting. Challenges and risks: Acknowledge the challenges and risks associated with NFTs, such as environmental concerns related to blockchain networks and the potential for fraudulent activity. Conclusion: Summarize the key takeaways of the presentation and emphasize the growing importance of NFTs in the digital world.

1. NON-FUNGIBLE
TOKENS. FROM SMART
CONTRACT CODE TO
MARKETPLACE
NFTs
3/2/2023

2. DISCLAIMER
§ The views and opinions expressed by the Presenter are those of the Presenter.
§ Presentation is not intended as legal or financial advice and may not be used as legal or
financial advice.
§ Every effort has been made to assure this information is up-to-date as of the date of
publication.

3. FUNGIBLE VS NON-FUNGIBLE
ASSETS
Fungible Non-fungible

4. NFT DEFINITION
“A non-fungible token (NFT) is a unique
and non-interchangeable unit of data stored
on a digital ledger (blockchain). NFTs can be
used to represent easily-reproducible items
such as photos, videos, audio, and other
types of digital files as unique items, and use
blockchain technology to establish a verified
and public proof of ownership.”

5. “NFT” NAME ORIGIN
“NFT” was satisfactory to nearly everyone surveyed and is widely
applicable to a broad universe of distinguishable digital assets. We
recognize that “deed” is very descriptive for certain applications of
this standard (notably, physical property).
Alternatives considered: distinguishable asset, title,
token, asset, equity, ticket

6. HISTORY 2012 to 2023

7. HISTORY: COLORED COINS. 2012
Field Description Size
OAP Marker
A tag indicating that this
transaction is an Open
Assets transaction. It is
always 0x4f41.
2 bytes
Version number
The major revision
number of the Open
Assets Protocol. For this
version, it is 1 (0x0100).
2 bytes
Asset quantity count
A var-
integer representing the
number of items in
the asset quantity
list field.
1-9 bytes
Asset quantity list
A list of zero or
more LEB128-
encoded unsigned
integers representing
the asset quantity of
every output in order
(excluding the marker
output).
Variable
Metadata length
The var-integer encoded
length of
the metadata field.
1-9 bytes
OP_RETURN

8. PEPE MEMS. 2017
1.Cultural significance: Pepe the Frog is a
popular internet meme that has gained
widespread cultural significance, particularly
among younger generations
2.Rarity and uniqueness: NFTs allow
Pepe memes to be represented as unique
and one-of-a-kind digital assets, with each
NFT representing a specific Pepe image or
artwork.
3.Innovation in digital art: Pepe memes
have inspired new and innovative forms of
digital art, as creators experiment with
different styles and techniques to create
unique and visually striking NFTs
4.Brand partnerships: Some NFT projects
based on Pepe memes have sought to
collaborate with brands or artists to create
unique and innovative artwork that
incorporates the Pepe character. This has
helped to increase the visibility and reach of
Pepe memes, as well as promote new and
exciting forms of digital art and creativity.

9. HISTORY: CRYPTO KITTIES. 2017
1.Unique digital cats: CryptoKitties are
unique, digital cats that are represented
as NFTs on the Ethereum blockchain
2.Collectible and tradeable: As NFTs,
CryptoKitties are collectible and
tradeable, meaning that they can be
bought and sold on various NFT
marketplaces.
3.Breeding and genetics: CryptoKitties
can be bred together to create new,
unique cats with different traits and
characteristics. This has led to the
development of a complex genetics
system that governs the inheritance of
traits from one generation to the next.
4.Impact on NFT market: CryptoKitties
is often cited as a major catalyst for the
growth of the NFT market, which has
exploded in recent years with the rise of

10. AXIE INFINITY (MARCH 2018)
1.Game assets as NFTs: In Axie Infinity, players
can own and trade in-game assets such as Axies,
which are represented as NFTs on the Ethereum
blockchain.
2.Play-to-earn model: Axie Infinity has gained
attention for its innovative play-to-earn model,
which allows players to earn real-world rewards in
the form of cryptocurrency by playing the game
and earning in-game rewards.
3.NFT marketplace integration: Axie Infinity has
integrated with various NFT marketplaces, such
as OpenSea and Binance NFT, allowing players to
buy and sell Axies and other game assets on
these platforms.
4.Community engagement: Axie Infinity has built
a strong and dedicated community of players,
collectors, and fans, who are passionate about the

11. BORED APE YACHT CLUB (APRIL
2021)
10,000 unique NFTs
NFT holders have full
commercialization rights
to the Ape that they own

12. CURRENT STATE OF NFT March 2023

13. CURRENT STATE*
The NFT market registered $946 million in trading volume and 9.5
million in sales count, up 38 and 42% from December.
Driven by the rise in popularity of its NFT collections, Polygon
recorded a 124% increase in trading volume and 157.39%
increase in sales count
OpenSea has an increase in trading volume of 66.58% reaching
$495 million in January 2023. This represents 58% of the total
trading volume of the NFT market.
* Based by the information provided by DappRadar

14. TRADING VOLUME
https://dappradar.com/blog/2023-begins-with-a-comeback-nfts-and-defi-show-recovery-signs

15. COMMON NFT USE CASES AND
OPERATIONS
NFTs can be created and minted by artists, musicians, or other content creators. The process of creating an
NFT typically involves uploading the digital asset to a blockchain platform, specifying the terms of ownership
and distribution, and setting a price or auctioning it off to the highest bidder.
Creation
NFTs can be transferred from one owner to another, either through a direct sale or through an auction. The
transfer process is managed through the blockchain, which records the transfer of ownership and the history
of each NFT.
Transfer
NFTs can be bought and sold on various online marketplaces, allowing owners to trade their NFTs for other
NFTs or for cryptocurrencies or fiat currency
Trading
NFTs can be licensed to other parties for specific uses, such as displaying a piece of artwork in a virtual
museum or using a piece of music in a video game. The terms of the license are typically specified in the
NFT's smart contract, which is stored on the blockchain.
Licensing
NFTs can be set up to generate royalties for the creator whenever the NFT is sold or used in certain ways,
providing a new source of income for content creators
Royalties
NFTs can be used to authenticate and verify the ownership and provenance of digital assets, such as
artwork, music, or video. The NFT's unique identifier and ownership history stored on the blockchain provide
a secure and transparent way to verify the authenticity of the asset.
Authentication

16. COMMON AREAS WHERE NFTS ARE
IN USE
Art Games Luxury brands
Event and other
tickets
Sports
Athletic and
other
memorabilia
Supply chain
and logistics
Real estate
Proof of
ownership
Licenses and
certificates
Domain name
records

17. NFT EXPERIENCE WITH
OPENSEA
Creating and selling token
on OpenSea as 1-2-3

18. 1. CREATING COLLECTION

19. 2. CREATING ITEM

20. 3. PUT ON SALE

21. NON-FUNGIBLE TOKEN
TRACKER
How to find popular NFT
projects on Ethereum
Mainnet?

22. NON-FUNGIBLE TOKEN TRACKER

23. NON-FUNGIBLE TOKEN TRACKER

24. DEEP DIVE Contracts

25. COMMON TOKEN STANDARDS
ERC-721
Default
Gold Standard
Most widely used
Not suitable for minting NFTs in
mass
Transferring one token at a time
Contains “symbol” and “name”
ERC-1155
Dual purpose: fungible and non
fungible
Used often to tokenize things
like common gaming skins and
other commoditized items
Single contract to make various
types of NFT
Less information in blockchain
logs (in events)
All metadata in URI

26. ERC-721 FUNCTIONS
balanceOf(owner)
ownerOf(tokenId)
safeTransferFrom(from, to, tokenId)
transferFrom(from, to, tokenId)
approve(to, tokenId)
getApproved(tokenId)
setApprovalForAll(operator, _approved)

27. ERC-721 METADATA EXTENSION
name()
symbol()
tokenURI(uint256_tokenId)
{
"title": "Asset Metadata",
"type": "object",
"properties": {
"name": {
"type": "string",
"description": "Identifies the asset to which
this NFT represents"
},
"description": {
"type": "string",
"description": "Describes the asset to which
this NFT represents"
},
"image": {
"type": "string",
"description": "A URI pointing to a resource
with mime type image/* representing the asset to
which this NFT represents. Consider making any
images at a width between 320 and 1080 pixels and
aspect ratio between 1.91:1 and 4:5 inclusive."
}
}
}

28. ERC-721 ENUMERATION
EXTENSION
totalSupply()
tokenByIndex(uint256_index)
tokenOfOwnerByIndex(address_owner,uint256_index)

29. ERC-721 EVENTS
•Transfer(from, to, tokenId)
•Approval(owner, approved, tokenId)
•ApprovalForAll(owner, operator, approved)

30. DEMO Creating contract
Minting and Selling NFT

31. HANDS-ON EXERSICE ERC-721
FROM “SCRATCH”
Create
ERC-721
Compile Deploy
Check in
Explorer

32. OPEN ZEPPELIN CONTRACTS
WIZARD

33. URI WITH NAME, DESCRIPTION,
AND IMAGE
{
name: "Thor's hammer",
description: "Mj�lnir, the legendary hammer
of the Norse god of thunder.",
image: "https://cdn.pixabay.com/photo/2013/07
/12/12/58/tv-test-pattern-
146649_960_720.png",
strength: 20
}

34. URI WITH NAME, DESCRIPTION,
AND IMAGE
{
name: "Thor's hammer",
description: "Mj�lnir, the legendary hammer
of the Norse god of thunder.",
image: "https://cdn.pixabay.com/photo/2013/07
/12/12/58/tv-test-pattern-
146649_960_720.png",
strength: 20
}

35. REMIX

36. DEPLOY 721CONTRACT

37. MINT THE TOKEN

38. CHECK THE CONTRACT ON
ETHERSCAN

39. CHECK EVENTS ON ETHERSCAN

40. ADD TO OPENSEA

41. PUT TOKEN FOR SALE ON
OPENSEA

42. NFT MARKETPLACES
https://opensea.io/
https://axieinfinity.com/
https://www.larvalabs.com/cryptop
nks
https://superrare.com/
https://wax.atomicmarket.io/
https://nbatopshot.com/

43. OPENSEA https://opensea.io/

44. COINBASE

45. NFTRADE
https://nftrade.com/

46. QUESTIONS?

47. STAY IN TOUCH
Gene Leybzon https://www.linkedin.com/in/leybzon/
https://www.meetup.com/members/90744
20/
https://www.leybzon.com