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Anna Kondratenko 👩🏻‍💻 Profile picture
@anacoding
May 11, 2022 • 9 tweets • 4 min read • Read on X
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Day 63 of #100DaysOfDeFI 🚀 Today I learned how to deploy an NFT collection on a testnet 🤖  and uploaded a collection of watermelon houses generated with AI on OpenSea 🐳  special thanks to @javilop for creating these cute houses! 🍉
#womenwhocode #100DaysOfCode

Summary 🧵
1/ First, upload a collection of images on Pinata, I described it in detail on day 56 of the challenge 🔙
2/ Now create json files for each image and add CID to “image” 👇
3/ Next upload folder with json files to Pinata 🦙
4/ After preparing the files we can write a smart contract and deploy it on Rinkeby 👩🏻‍💻 
Code 👇
5/ Make sure you’re connected to Rinkeby testnet on MetaMask 🦊  and the environment is “Injected Web3” in Remix 🤖  Deploy the contract.
6/ After the contract has been deployed, you can mint NFTs directly 👇
7/ Now go to testnets.opensea.io, connect with your wallet and you’ll be able to see the first minted image in your collections 🖼️  You can go on and mint all the images 🦾
8/ The watermelon houses collection is ready 🎉

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More from @anacoding

Anna Kondratenko 👩🏻‍💻 Profile picture
May 27, 2022
Day 75 of #100DaysOfDeFI 🚀 today 3/4 of the challenge is done! 🎉  Also today I finish exploring Solidity vulnerabilities with learning about Denial of service (DoS) attacks 🦹🏼‍♀️
#womenwhocode #100DaysOfCode

How it works 🧵
1/ There are many ways to attack a smart contract and at some point create a DoS⚡
2/ Denial of Service attack paralyzes a smart contract and makes it temporarily unusable 🛑
Read 9 tweets
Anna Kondratenko 👩🏻‍💻 Profile picture
May 26, 2022
Day 74 of #100DaysOfDeFI 🚀 Today I learned about Delegate Call vulnerability in #Solidity 🦹🏼‍♀️  When using delegatecall opcode one should be careful because wrong usage will lead to unexpected results ⚠️
#womenwhocode #100DaysOfCode

How it works 🧵 Image
1/ What delegatecall is? When contract A uses delegatecall to call contract B it means that the contract B code will be executed inside context of the contract A: storage, msg.sender, msg.value, msg.data, etc will be the A’s context.
2/ Storage layout must be the same for contract A and contract B → it means both contracts should declare the same state variables in the same order 👾
Read 8 tweets
Anna Kondratenko 👩🏻‍💻 Profile picture
May 25, 2022
Day 73 of #100DaysOfDeFI 🚀 Learned about Self Destruct vulnerability in #Solidity 🦹🏼‍♀️ Selfdestruct deletes the contract from the blockchain and and sends all Ether to a designated address 💸  In some scenarios it can lead to unexpected problems ❌
#100DaysOfCode

How it works 🧵
1/ Let’s see how it works with an example of a simple game 🎲  Players send to the contract 1 token 🪙 the one who deposits the fifth token wins 🏆
Game code 👇
2/ Attacker smart contract 🦹🏼‍♀️
Read 5 tweets
Anna Kondratenko 👩🏻‍💻 Profile picture
May 24, 2022
Day 72 of #100DaysOfDeFI 🚀  Today I looked at arithmetic Over/Under Flows in #Solidity 👾 This vulnerability been secured by the current Solidity version 🦸‍♂️ Nevertheless, it is important to understand what it is and how to avoid it 👩🏻‍💻
#womenwhocode #100DaysOfCode

Summary 🧵 Image
1/ An overflow in Solidity occurs when a number is incremented beyond its maximum value. For example, if we have a uint8 with a value of 255 and increment it by 1, it will “reset” and set a value to 0. Remember, the maximum value for uint8 is 255❗
2/ Similar thing happens when we decrease a value beyond its minimal level. Taking the same example, if a uint8 is set to 0 and we decrease it by 1, it will set to 255, since 0 is the minimal value of uint8❗
Read 7 tweets
Anna Kondratenko 👩🏻‍💻 Profile picture
May 23, 2022
Day 71 of #100DaysOfDeFI 🚀 looked at Re-Entrancy vulnerability🦹🏻 It is one of the most destructive attacks in the #Solidity smart contracts 💸 The untrusted contract that exploits the vulnerability is able to drain all user's funds 🚰
#100DaysOfCode

How it works 🧵
1/ To make it happen, there should be 2 contracts: a vulnerable contract and an attacker’s contract 👺
2/ The attacker should deposit some funds into the vulnerable contract 💰
Read 11 tweets
Anna Kondratenko 👩🏻‍💻 Profile picture
May 18, 2022
Day 68 of #100DaysOfDeFI 🚀 Today I worked on the Factory smart contract that is a part of the decentralized exchange architecture 💱  Factory creates and keeps track of all Pair contracts 👩🏻‍💻
#womenwhocode #100DaysOfCode

Summary 🧵 Image
1/ The Factory will include:
🔷 createPair - create a Liquidity Pool;
🔷 adjustAmount - adjust a number of tokens using a formula;
🔷 getReserves - a getter function;
🔷 addLiquidity - add liquidity to the LP;
🔷 removeLiquidity - withdraw liquidity;
🔷 trade1for2 - swap tokens.
2/ First, initialize contract and define the state variables 👩🏻‍💻 Image
Read 8 tweets

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