Lesson9ChallengeSolved. Tricky outcome. Caution - some logic spoilers.

[mibiot]

Hi all,
Few days I have been trying to solve the challenge for Lesson9. I started this course with 0 skills in coding, so it took a while to start to read and even write some code. So the project to solve Lesson9 quest was the first contract I created by myself from scratch. Here I would like to share the results since the outcome seems a bit tricky. I will try not to spoil the quest but to explain the outcome I have to share the logic, so those who still want to think and solve the quest by themselves please do not follow further.

I made a contract(lets call it C for further explanations) that calculates the right answer and calls the solveChallenge function from the Lesson9 contract. C also has 2 functions - onERC721Received and transferFrom (in the first run I used safeTransferFrom), thus the logic was to get an NFT for solving the quest and then transfer it to my wallet. Then I made a script for deploying C, ran it on --fork-url, all worked, and so I decided to run it on Sepolia.

The script ran successfully, and here what happened next: C got and NFT, successfully transferred the NFT to my wallet, but C still had kept the ownership for the NFT (accordingly to FCN contract (0x76B50696B8EFFCA6Ee6Da7F6471110F334536321))The NFT is in my wallet but my wallet address has no rights for the NFT according to the FCN contract's database. Ok, so this morning I decided to change the function that transfers the NFT from C (to be precise a new version of C that will be created with the Script) to my wallet after getting a minted NFT from FCN. I asked AI if there was a function that transfer the ownership for an NFT when transferring it. AI said there was one - transferFrom, so I decided to change safeTransferFrom to transferFrom, ran the Script again and the same things happened except only one detail - the minted token was transferred to my wallet with #0 tokenId instead of 1300 as it had originally.

So here are few questions I would like to discuss to understand the subject better:

• 1. if there any chance to transfer the ownership of these 2 tokens to my wallet? (they are both in my wallet but without the ownership). I actually thought when transferring an NFT the ownership is transferred automatically, but the FCN contract doesn't recognise my address as an owner of these 2 tokens.
• 2. what function (or function settings) should I use to transfer an NFT with the ownership from C to my wallet?
• 3. it looks like using this script unlimited number of the NFTs for solving this challenge can be minted, since each new NFT is minted for a new contract (obviously, I am not going to do this, but that s what the situation is). And if I understood the topic of the lesson correctly we can go even further by adding an automation feature that will call the run function of the Script (I m not sure if a script can be automated, since for upkeep to run it requires a contract address, and will call functions of the deployed contract, but here the Script should be called. *a question by the way), -> create a new contract ->solve the challenge -> get new NFT -> transfer the NFT to the specified wallet.

The numbers of the NFTs I am talking about are 1298 and 1300. You can check all transaction in Etherscan.

Thanks for sharing your ideas.