Verification of submitted transaction.

[osephson]

Hi,
To send just-minted NFTs to other wallet, it's essential to check if the submitted transaction for minting the tokens is verified.
Is there any way to find it?

[miguelaeh]

Could you elaborate on what you mean by "verified" please?

[osephson]

Let me explain what I'm actually doing:
(first of all, imagine there are 10,000,000 lovelace in my wallet)

1. Mint NFTs (for my wallet)
2. After minting, send that NFTs to other wallet.

I've written 2 methods(mintNFTs, sendNFTs) for each feature above.
Then, calling sendNFTs right after mintNFTs will build a transaction, and that transaction includes --tx-out=${mywalletaddress}+10000000 causes the ValueNotConservedUTXO error. The reason is because lovelace of wallet is not actually 10000000 after that minting. Makes sense?

So I have to wait until the transaction for mint is verified, and after that I call the sendNFTs.
For a solution, I will make a method verifyTransaction like this:

const verifyTransaction = (txHash: string) => {
  return new Promise((res) => {
    console.log(`Verifying minted transaction for ${txHash}...`);
    while (true) {
      var transInfo = cardano.queryUtxoByTransactionHash(txHash, 0);
      if (transInfo && transInfo.length) {
        console.log(`Transaction for ${txHash} has verified!`);
        res('Verified');
        break;
      }
    }
  });
};

And use it between mintNFTs and sendNFTs.

Promise.resolve(mintNFTs) // returns the hash of the minting transaction
  .then(verifyTransaction) // check that transaction is verified
  .then(sendNFTs); // after verified, then send!

I'm not good at Cardano, and not sure this is a good approach. I really want your opinions.

[osephson]

To tell you the truth, I came up this logic because I couldn't find the way to mint NFTs directly to other wallet. Is it impossible to mint tokens directly?

[miguelaeh]

I think I got your point. You want to listen to the network to check when the transaction is submitted to create the next one right?

This library does not offer such a feature out of the box since it is just a wrapper around cardano-cli, but you can build your methods using the library as you did.

I think you are looking for this

[osephson]

Perfect! BTW, I think it's essential and will be necessary to implement such a new feature to make this library more powerful and adoptable.

Thanks for sending the url which was a great help, but there's no tech solution to check the status of the transaction.
Do you have any idea on this?

[miguelaeh]

Do you have any idea on this?

I am not sure since I don't usually work with NFTs, but it is highly probable that some see already solved that problem.