Rosario Borgesi | Paragraph

Rosario Borgesi | Paragraph

Mar 24

⚡Day 9 of Ethernaut with @OpenZeppelin ⚙️ Challenge 15: Naught Coin ✅ Challenge 14: Gatekeeper Two ✅ Challenge 13: Gatekeeper One ✅ Challenge 12: Privacy ✅ Challenge 11: Elevator ✅ Challenge 10: Re-entrancy ✅ Challenge 09: King ✅ Challenge 08: Vault ✅ Challenge 07: Force ✅ Challenge 06: Delegation ✅ Challenge 05: Token ✅ Challenge 04: Telephone ✅ Challenge 03: Coin Flip ✅ Challenge 02: Fallout ✅ Challenge 01: Fallback ✅ Challenge 00: Hello Ethernaut Github 👇 https://github.com/rosarioborgesi/ethernaut-challenges

GitHub - rosarioborgesi/ethernaut-challenges

GitHub

GitHub - rosarioborgesi/ethernaut-challenges

Contribute to rosarioborgesi/ethernaut-challenges development by creating an account on GitHub.

Mar 23

⚡Day 8 of Ethernaut with @OpenZeppelin ⚙️ Challenge 13: Gatekeeper One ✅ Challenge 12: Privacy ✅ Challenge 11: Elevator ✅ Challenge 10: Re-entrancy ✅ Challenge 09: King ✅ Challenge 08: Vault ✅ Challenge 07: Force ✅ Challenge 06: Delegation ✅ Challenge 05: Token ✅ Challenge 04: Telephone ✅ Challenge 03: Coin Flip ✅ Challenge 02: Fallout ✅ Challenge 01: Fallback ✅ Challenge 00: Hello Ethernaut Github 👇 https://github.com/rosarioborgesi/ethernaut-challenges

GitHub - rosarioborgesi/ethernaut-challenges

GitHub

GitHub - rosarioborgesi/ethernaut-challenges

Contribute to rosarioborgesi/ethernaut-challenges development by creating an account on GitHub.

Mar 22

⚠️I think I’ve covered the major DeFi protocols on Ethereum in this playlist: • @uniswap • @aave • stablecoins • @lidofinance Next up, I’m thinking about diving into @morpho 👀 What do you think — good choice or something else I should cover? https://youtube.com/playlist?list=PLVTbEqrA6Bw6FBWXt_-2YRc6kKCEu5nNf&si=gr9RogTtrK8jon0p

DeFi

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DeFi

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Mar 21

You see $3,000 ETH on @uniswap You swap… and get less. That’s slippage. AMMs don’t have fixed prices — your trade moves the price. If you want to understand why 👇 https://youtu.be/JJB31T7o1is?si=GmoxAnhKiQy7iOaf

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Mar 20

⚡Day 7 of Ethernaut with @OpenZeppelin ⚙️ Challenge 13: Gatekeeper One ✅ Challenge 12: Privacy ✅ Challenge 11: Elevator ✅ Challenge 10: Re-entrancy ✅ Challenge 09: King ✅ Challenge 08: Vault ✅ Challenge 07: Force ✅ Challenge 06: Delegation ✅ Challenge 05: Token ✅ Challenge 04: Telephone ✅ Challenge 03: Coin Flip ✅ Challenge 02: Fallout ✅ Challenge 01: Fallback ✅ Challenge 00: Hello Ethernaut Github 👇 https://github.com/rosarioborgesi/ethernaut-challenges

GitHub - rosarioborgesi/ethernaut-challenges

GitHub

GitHub - rosarioborgesi/ethernaut-challenges

Contribute to rosarioborgesi/ethernaut-challenges development by creating an account on GitHub.

Mar 19

⚡Day 6 of Ethernaut with @OpenZeppelin ⚙️ Challenge 11: Elevator ✅ Challenge 10: Re-entrancy ✅ Challenge 09: King ✅ Challenge 08: Vault ✅ Challenge 07: Force ✅ Challenge 06: Delegation ✅ Challenge 05: Token ✅ Challenge 04: Telephone ✅ Challenge 03: Coin Flip ✅ Challenge 02: Fallout ✅ Challenge 01: Fallback ✅ Challenge 00: Hello Ethernaut Github 👇 https://github.com/rosarioborgesi/ethernaut-challenges

GitHub - rosarioborgesi/ethernaut-challenges

GitHub

GitHub - rosarioborgesi/ethernaut-challenges

Contribute to rosarioborgesi/ethernaut-challenges development by creating an account on GitHub.

Mar 19

📌 Transfer vs Call — what actually reverts? When sending ETH: 🔹 transfer ❌ reverts automatically on failure 🔹 call ⚠️ returns false, does NOT revert 💣 Hack Example — King of the Ether If they had used call instead of transfer, the hack wouldn’t work 👇

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Mar 18

⚡Day 5 of Ethernaut with @OpenZeppelin ⚙️ Challenge 10: Re-entrancy ✅ Challenge 09: King ✅ Challenge 08: Vault ✅ Challenge 07: Force ✅ Challenge 06: Delegation ✅ Challenge 05: Token ✅ Challenge 04: Telephone ✅ Challenge 03: Coin Flip ✅ Challenge 02: Fallout ✅ Challenge 01: Fallback ✅ Challenge 00: Hello Ethernaut Github 👇 https://github.com/rosarioborgesi/ethernaut-challenges

GitHub - rosarioborgesi/ethernaut-challenges

GitHub

GitHub - rosarioborgesi/ethernaut-challenges

Contribute to rosarioborgesi/ethernaut-challenges development by creating an account on GitHub.

Mar 18

📌 Why “private” variables in Solidity are still public Most people think private in Solidity means hidden. It doesn’t. Everything stored onchain is public 👇

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Mar 17

⚡Day 4 of Ethernaut with @OpenZeppelin ⚙️ Challenge 08: Vault ✅ Challenge 07: Force ✅ Challenge 06: Delegation ✅ Challenge 05: Token ✅ Challenge 04: Telephone ✅ Challenge 03: Coin Flip ✅ Challenge 02: Fallout ✅ Challenge 01: Fallback ✅ Challenge 00: Hello Ethernaut Github 👇 https://github.com/rosarioborgesi/ethernaut-challenges

GitHub - rosarioborgesi/ethernaut-challenges

GitHub

GitHub - rosarioborgesi/ethernaut-challenges

Contribute to rosarioborgesi/ethernaut-challenges development by creating an account on GitHub.

Mar 16

⚡Day 3 of Ethernaut with @OpenZeppelin ⚙️ Challenge 05: Token ✅ Challenge 04: Telephone ✅ Challenge 03: Coin Flip ✅ Challenge 02: Fallout ✅ Challenge 01: Fallback ✅ Challenge 00: Hello Ethernaut Github 👇 https://github.com/rosarioborgesi/ethernaut-challenges

GitHub - rosarioborgesi/ethernaut-challenges

GitHub

GitHub - rosarioborgesi/ethernaut-challenges

Contribute to rosarioborgesi/ethernaut-challenges development by creating an account on GitHub.

Mar 15

When you start studying DeFi protocols, you realize that knowing Solidity is only half of the job. A lot of financial mechanisms sit behind these protocols: liquidity, collateralization, incentives, interest models, peg stability, liquidations. Being a good coder is not enough. You also need to understand the economic design that makes a protocol work. That’s one of the reasons I started making these DeFi videos: to learn these protocols deeply myself and help others understand them. If you're learning DeFi this playlist might help 👇 https://youtube.com/playlist?list=PLVTbEqrA6Bw6FBWXt_-2YRc6kKCEu5nNf&si=vO7q5S8FcByjQ5wy

DeFi

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DeFi

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Mar 13

⚡Day 2 of Ethernaut with @OpenZeppelin ⚙️ Challenge 03: Coin Flip ✅ Challenge 02: Fallout ✅ Challenge 01: Fallback ✅ Challenge 00: Hello Ethernaut Github 👇 https://github.com/rosarioborgesi/ethernaut-challenges

GitHub - rosarioborgesi/ethernaut-challenges

GitHub

GitHub - rosarioborgesi/ethernaut-challenges

Contribute to rosarioborgesi/ethernaut-challenges development by creating an account on GitHub.

Mar 13

📌 Calling receive() with Foundry receive() is triggered when a contract receives ETH with empty calldata. You don’t call it like a normal function. Instead, you simply send ETH to the contract using cast send.

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Mar 12

⚡Day 1 of Ethernaut with @openzeppelin ✅ Challenge 1: Hello Ethernaut Github 👇 https://github.com/rosarioborgesi/ethernaut-challenges

GitHub - rosarioborgesi/ethernaut-challenges

GitHub

GitHub - rosarioborgesi/ethernaut-challenges

Contribute to rosarioborgesi/ethernaut-challenges development by creating an account on GitHub.

Mar 12

📌 Solved the Hello Ethernaut challenge from @openzeppelin 🛡️ A nice reminder about string comparison in Solidity: if ( keccak256(abi.encodePacked(param)) == keccak256(abi.encodePacked("hello")) ) Solidity can’t compare string values directly because they are dynamic types stored in memory. The common pattern is to compare hashes using keccak256.

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Mar 12

📍Progress on my journey to become a Solidity developer: ✅ Cyfrin Updraft courses (Solidity fundamentals → Advanced Foundry) 👉 https://profiles.cyfrin.io/u/rosarioborgesi ✅ @buidlguidl Speedrun Ethereum challenges 👉 https://speedrunethereum.com/builders/0xce626A7dF0e36281e410Faa1808685BB17779741 ⚙️Next step: OpenZeppelin Ethernaut

Profiles

Profiles

Profiles

Profiles by Cyfrin

0xce62...779741 | Speedrun Ethereum

0xce62...779741 | Speedrun Ethereum

Learn Solidity development to build dapps on Ethereum with hands-on blockchain challenges.

Mar 12

⚡Day 24 of Speed Run Ethereum with @buidlguidl Challenges completed! 🚀 ✅ Challenge 9: 🔒 ZK Voting ✅ Challenge 8: 🏎️ Prediction Markets ✅ Challenge 7: 💰 MyUSD Stablecoin ✅ Challenge 6: 🌽 Over-Collateralized Lending ✅ Challenge 5: 🔮 Oracle Challenge ✅ Challenge 4: ⚖️ Build a DEX ✅ Challenge 3: 🎲 Dice Game ✅ Challenge 2: 🏵 Token Vendor ✅ Challenge 1: 📣 Crowdfunding App ✅ Challenge 0: 🎟 Tokenization Portfolio 👇 https://speedrunethereum.com/builders/0xce626A7dF0e36281e410Faa1808685BB17779741 Github 👇 https://github.com/rosarioborgesi/speed-run-ethereum-challenges

0xce62...779741 | Speedrun Ethereum

0xce62...779741 | Speedrun Ethereum

Learn Solidity development to build dapps on Ethereum with hands-on blockchain challenges.

GitHub - rosarioborgesi/speed-run-ethereum-challenges

GitHub

GitHub - rosarioborgesi/speed-run-ethereum-challenges

Contribute to rosarioborgesi/speed-run-ethereum-challenges development by creating an account on GitHub.

Mar 11

⚡Day 23 of Speed Run Ethereum with @buidlguidl ⚙️ Challenge 9: 🔒 ZK Voting ✅ Challenge 8: 🏎️ Prediction Markets ✅ Challenge 7: 💰 MyUSD Stablecoin ✅ Challenge 6: 🌽 Over-Collateralized Lending ✅ Challenge 5: 🔮 Oracle Challenge ✅ Challenge 4: ⚖️ Build a DEX ✅ Challenge 3: 🎲 Dice Game ✅ Challenge 2: 🏵 Token Vendor ✅ Challenge 1: 📣 Crowdfunding App ✅ Challenge 0: 🎟 Tokenization Portfolio 👇 https://speedrunethereum.com/builders/0xce626A7dF0e36281e410Faa1808685BB17779741 Github 👇 https://github.com/rosarioborgesi/speed-run-ethereum-challenges

0xce62...779741 | Speedrun Ethereum

0xce62...779741 | Speedrun Ethereum

Learn Solidity development to build dapps on Ethereum with hands-on blockchain challenges.

GitHub - rosarioborgesi/speed-run-ethereum-challenges

GitHub

GitHub - rosarioborgesi/speed-run-ethereum-challenges

Contribute to rosarioborgesi/speed-run-ethereum-challenges development by creating an account on GitHub.

Mar 11

📌 Comparing bytes32 and uint256 In Solidity, bytes32 and uint256 are both 32 bytes, so you can safely cast one into the other before comparing. You can either: • cast bytes32 → uint256 • cast uint256 → bytes32 Both work because bytes32 = 256 bits uint256 = 256 bits They occupy the same EVM size.