What is the significance of QR code on video at starting of 2nd lesson?

[vivart]

There is a qr code on screen when lesson 2 starts. I can scan and see it’s a contract address but I didn’t get what is the significance here?

[cromewar]

Hello @vivart
Seems a link for a NFT contract, may be is an Easter Egg Patrick left, but let's just ask him.
@PatrickAlphaC 👀👀

[IamGalexing]

Yes, please. I wonder too 🙂

[cryptokris-eth]

I think that if you follow the link on arbiscan.io and then go to the tab contract and then write, you will find a mintnft method that you can call to get an NFT. I have not tried it as the gas fee is enormous like 0.08 ETH at the time of this message.

[thevolcanomanishere]

It looks like its just an NFT from another course he did

[PatrickAlphaC]

Not quite ;)

[PatrickAlphaC]

The QR codes lead to optional easter egg NFTs :)

I didn't want to promote them since you'll have to spend real ETH to claim them. So yes, they are 100% optional! If you don't want to spend the ETH on them, you can just skip them!

In order to solve them, you'll have to call the mintNft functions on the contracts - which get harder with each completed lesson 😈. You can then view them on the L2 NFT Marketplace StratosNft, it's similar to Opensea.

Have fun, and good luck :)

[SlothXGreaver]

The issue was incorrect inputs on the mint ft questions.
0.00018659222494 eth ($0.22c)!
Now for the 3rd, a bit trickier!

[tarunkotagiri0]

@alymurtazamemon @SlothXGreaver , StratosNFT.io is no longer operational, if we claim the NFTS can we view them on opensea?

[alymurtazamemon]

@tarunkotagiri0 Yes, you can view it on open sea.

[tarunkotagiri0]

@tarunkotagiri0 Yes, you can view it on open sea.

Cool. Thanks.

[tarunkotagiri0]

Hi @ali-thegilfoyle ! Just a question: I minted the first Easter Egg token for 0.00021286 ETH (around .20c) This second token is gassing me 0.07351312ETH (around $127!!!! - I have not confirmed it yet - I think there's an error -or hope). I copied the code over to remix to test the 'location' and 'newLocation' problem. And got the answers. But when I go to mintNft Metamask wants to bend me over!!

What was your experience of PHFCC token 2??

How exactly do we know the answers for location and new location? Need assistance with this.

[neerajnerlekar]

Is anyone else facing gigantic fees to mintNft? Shows me around $233 to mint. Not sure if I am doing it correct => Went to Write Contract => mintNft => location 0, newLocation 10

[neerajnerlekar]

Checked my inputs and successfully mint one. 🙌🏽👷🏽‍♂️

[RamanSB]

@PatrickAlphaC the gas fee is astronomically high, did you optimize your code for gas efficiency ;)

boolean array element at index 3 (4th element) is true and any index ([0, 4]) can be passed for the 2nd argument... however gas fee is astronomical?

Why is that?

[RamanSB]

Bruh, just minted it, looking at the code you won't be able to tell what position the true flag is in, because the code is only showing the array when the contract is deployed, since then 215 txns from other users have changed the location. Also, we are unable to read the s_booleanArray as it is private or can we? It is a state variable after all so must be accessible somehow or no? I'm assuming no hence the guess work. I thought state variables are on chain and therefore accessible somehow?

[RamanSB]

Hey @PatrickAlphaC I realised it's possible to view a contracts storage via hardhat. If we use ethers when connected to ARBITRUM's RPC_URL and we have your contract address we could do the following:

ethers.provider.getStorageAt(contractAddress, slot)

Would that work, trying to replicate it VSCode...

Please take a look at this thread and let me know how I should interpret the results, because I still do not understand...

[PatrickAlphaC]

Nice work! yes, you can read storage variables even if they are private! Yes you can brute force guesswork the location if you like, though. You can also look at transaction history and see the new location others picked. There were several ways to solve this puzzle.

You'll learn more about storage later in the course.

[tzayda]

I minted the first NFT, but cannot find its location. Where do I get to see my NFT?))

[tzayda]

I just found it! It is available on https://stratosnft.io/. You just need to connect your wallet!

[salva1973]

I was also finally able to mint the first NFT... hooray!

Since I'm a total newbie with wallets and NFTs, I'd like to summarize step by step what I did in order to mint it, even if it sounds trivial to the most experienced students (maybe it could be useful to other newbies like myself).

1. I created an account in an Exchange such as Coinbase (they ask you for an identity document, a bill, and a tiny deposit to activate the account). It took me a couple of days to be operative.
2. I deposited a small amount of money (e.g. 50€) to the Exchange.
3. I bought some ETH (e.g. 25€) from the Exchange
4. I created a new account on Metamask (not to be used for the course exercises, but only for the NFTs)
5. I sent all of the ETH from the Exchange to Metamask's address of the new account (on the Mainnet)
6. I connected Metamask (with the new account) to StratosNft (https://stratosnft.io/)
7. I used their bridge (https://app.hop.exchange/) to move some ETH (e.g. 12€) in my Metamask wallet from the Mainnet to the Arbitrum network (the transaction took just a few minutes, but the gas costs were quite high, about 2.75€). This is important since I read that if you try to send money from one network to another without using a bridge, it's almost sure you're gonna loose the money
8. I finally reached out to the NFT page on Arbiscan, and as suggested in the previous comments I clicked on Contract, Write tab, I connected my Metamask wallet and I finally clicked on the Write button under the MintNft method: I accepted the transaction, and I paid a small figure (in €, less than half an Euro) to mint the NFT
9. I finally reached out to my profile page on StratosNft (My NFTs) and I was able to see my first NFT!

Hope this can be useful to someone else!

[khallar]

Thanks for taking the time! I`ll add to this step by step the values of local and new local i use (0000000000000000000000000000000000000000000000000000000000000003)
greatings form Argentina!.-

[thelastdemon1337]

I was also finally able to mint the first NFT... hooray!

Since I'm a total newbie with wallets and NFTs, I'd like to summarize step by step what I did in order to mint it, even if it sounds trivial to the most experienced students (maybe it could be useful to other newbies like myself).

1. I created an account in an Exchange such as Coinbase (they ask you for an identity document, a bill, and a tiny deposit to activate the account). It took me a couple of days to be operative.
2. I deposited a small amount of money (e.g. 50€) to the Exchange.
3. I bought some ETH (e.g. 25€) from the Exchange
4. I created a new account on Metamask (not to be used for the course exercises, but only for the NFTs)
5. I sent all of the ETH from the Exchange to Metamask's address of the new account (on the Mainnet)
6. I connected Metamask (with the new account) to StratosNft (https://stratosnft.io/)
7. I used their bridge (https://app.hop.exchange/) to move some ETH (e.g. 12€) in my Metamask wallet from the Mainnet to the Arbitrum network (the transaction took just a few minutes, but the gas costs were quite high, about 2.75€). This is important since I read that if you try to send money from one network to another without using a bridge, it's almost sure you're gonna loose the money
8. I finally reached out to the NFT page on Arbiscan, and as suggested in the previous comments I clicked on Contract, Write tab, I connected my Metamask wallet and I finally clicked on the Write button under the MintNft method: I accepted the transaction, and I paid a small figure (in €, less than half an Euro) to mint the NFT
9. I finally reached out to my profile page on StratosNft (My NFTs) and I was able to see my first NFT!

Hope this can be useful to someone else!

stratosnft.io is no longer operational!