4. Increase Scale (gas/block limit) Fraud Proof Rollups (Arbitrum, Optimism)
Fast, exclusive
Trust Big Computer Trust a few Big Computers
Fast, semi inclusive
5. Validity Proofs (StarkNet, zkSync)
Big computer to generate proof
Expensive, semi inclusive (~mining) Fast, inclusive
Small computer to verify proof
ZK-STARK
proof
6. *With respect to size of computation
Privacy (Zero Knowledge, ZK)
Prover’s private inputs are shielded
Scalability
Exponentially small verifier running time*
Nearly linear prover running time*
Prover verifier
v
π
ZK-STARK Proofs
Verify (all transactions), don’t trust
7. *With respect to size of computation
Privacy (Zero Knowledge, ZK)
Prover’s private inputs are shielded
Scalability
Exponentially small verifier running time*
Nearly linear prover running time*
Prover
Verify STARK proof, don’t trust
π, Statenew
ZK-STARK
v
v
v
v
v
v
π, Statenew
π, Statenew
π, Statenew
π, Statenew
π, Statenew
π, Statenew
ZK-STARK Proofs
9. $270B 65M $1.25B
9
Launched - June 2020
10M
NFTs Minted
Tx Settled
600K
NFT Mints/Proof
Total Value Locked
Cumulative Trading
486
Gas/tx
As of December 9, 2021
@henrilieutaud | @starkwareltd
10. Launched November 29, since then:
● StarkNet Developer Discord exploding:
○ 20K users, 3K joined last week
○ 2K weekly active users
10
@henrilieutaud | @starkwareltd
● 20+ teams building dApps, including:
○ 3 AMMs
○ Games, NFT projects
○ Voting, bridges, and more
Ethereum-style permissionless interaction with the network
12. Cairo
13
● Specially designed, provable language, dedicated for Smart Contracts
● Cairo is not bounded by the EVM
@henrilieutaud | @starkwareltd
Syntax tutorial on GitHub
➔ Coming soon: Solidity -> Cairo transpiler
13. Standard implementations
15
@henrilieutaud | @starkwareltd
● Open Zeppelin - developing a set of boiler plate smart contracts for Cairo
○ Today - use an implementation included in therepo (courtesy of Oasis)
● Cairo standards reuse Solidity standards - naming convention for external functions
Boiler plate smart contracts are great or StarkNet onboarding!
14. Importing functions
17
@henrilieutaud | @starkwareltd
● The importing pattern is not enforced by the compiler, and is being discussed by the community
○ Base contracts define core functions. They have no external functions and no constructor
○ Front end contracts import internal functions from base contracts, and wrap them in
external functions
Impot Functions Inherit Functions
15. Account abstraction
19
@henrilieutaud | @starkwareltd
● Transactions on StarkNet are different than Ethereum - they do not have an originator (“From”)
● They are sent to an “entry point” - an “account smart contract” in charge of:
○ Authenticating the user
○ Replay protection
○ Funds protection
○ Allows many different UX to be built upon
● This is not currently enforced
○ transactions can be sent to any contract, while the sender is seen as 0 by the receiver
16. Integrated Development Environments
21
3 main tools to interact with StarkNet:
@henrilieutaud | @starkwareltd
*All three are under development and require duct tape here and there
Today’s tutorial is based on Nile
HardHat
(Javascript)
StarkNet
CLI
Nile
(Python)
19. use use your NFTs in a growing metaverse
build
continue to create by disassembling NFTs back into briqs
your own NFTs with briqs
20.
21. - Online briq builder available
- ERC721 briq & set contracts
deployed on StarkNet mainnet &
testnet
- +1k NFT creations, 2.5K followers
briq alpha
first NFT project deployed
on StarkNet mainnet
22. - Difficult language but generally
good feedback from the compiler
- Math-heavy logic is particularly
tricky because of field
- Ecosystem is growing nicely
- Devnet wallet, Nile, …
- Lots of public interest
Feedback
first NFT project deployed
on StarkNet mainnet
25. ERC721 Workshop
30
Your objective - gather points.
Follow these steps to collect all points
1. Read the ReadMe for a high level understanding
2. Read the valuator.cairo code for a low level understanding
3. Use the ERC721 code and customize it
4. Deploy your contract
5. Submit your contract address to the evaluator
6. Ask the evaluator to correct your contract
7. Check for points
@henrilieutaud | @starkwareltd
Go to Github:
27. To go further
32
Jobs
- Dapp Developer at Shard labs.
- Open source developer at Open Zeppelin.
- Cairo engineers at Immutable.
- Chainlink integration team.
- Blockchain software engineer at JellyFi.
Resources on StarkNet
- Official Cairo documentation
- Community links - list of examples
curated by the StarkWare team
- Awesome StarkNet - a curated list of
resources by Georgios Konstantopoulos
Cool stuff built on StarkNet
- Physics simulation by @guiltygyoza
- briq V1 contracts
- Qasr, an ETH <> StarkNet NFT bridge
- Tictactoe by @guiltygyoza
@henrilieutaud | @starkwareltd
