Code in Solidity like a PRO with Egor Gavrilov. Check out YouTube channel ▶️

Last update: Dec 19, 2022

Overview

Code in Solidity like a PRO with Egor Gavrilov

Check out YouTube channel youtube.com/EgorGavrilov

Tutorials

Perfect Solidity Stack

It's easy to get started with Solidity programming, but how do you approach it professionally? We figure it out in this video.

Predict Contract Address

Deploy your Smart Contract with a precomputed address. We will write a Solidity Smart Contract with two options: using Create and Create2.

Rentable NFT

Rentable NFTs are the next big trend. Rent out an expensive NFT for one day and take advantage of all the benefits for a small fee.

Merkle Tree Airdrop

Use Merkle tree to airdrop your token in a cheap, elegant and efficient way.

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Comments

RentableNFT finishRenting vulnerability to return transferred token
RentableNFT finishRenting allows a lord to return a transferred token from the new owner if he is the last renter. A possible RentableNFT finishRenting abuse algorithm:

An owner of a token rentOut it to a renter.

Waits for the rental to expire and returns the token back.

The owner gives/sells the token again to the same renter. (Transfer)

Despite the fact that now the real owner of the token is the renter, the former owner has an opportunity to return the token back at any time through the same finishRenting.

To fix this, just add a check that the token is rented before returning it to its lord.
opened by SamWarden 2

Owner

Egor Gavrilov

XDAO CTO & Co-Founder. DeFi Startups Technology Advisor. Watch my YouTube DeFi videos ⬇️

GitHub https://youtube.com/EgorGavrilov

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