Troubleshooting signature errors in Hedera NFT minting

NFT
1

Help needed with Hedera Token Service NFT creation

I’m trying to mint an NFT using the Hedera Token Service (HTS) but I’m running into a snag. The documentation keeps throwing an INVALID_SIGNATURE error at me. I’ve double-checked my code for creating the signature, but I can’t figure out what’s wrong.

Here’s a simplified version of what I’m working with:

const privateKey = PrivateKey.generateED25519();
const publicKey = privateKey.publicKey;

const transaction = new TokenCreateTransaction()
    .setTokenName('MyNFT')
    .setTokenSymbol('MNFT')
    .setTokenType(TokenType.NonFungibleUnique)
    .setTreasuryAccountId(treasuryId)
    .setAdminKey(adminKey)
    .setSupplyKey(supplyKey)
    .freezeWith(client);

const signTx = await transaction.sign(privateKey);
const txResponse = await signTx.execute(client);

Any ideas on what might be causing this signature issue? I’m pretty new to Hedera, so I might be missing something obvious. Thanks in advance for any help!

2

hey there mia_17dance! :wave: i’ve been playing around with hedera nfts too and ran into some similar issues. have you double-checked that your client is properly set up with the right network and account info? sometimes those pesky signature errors can pop up if there’s a mismatch there.

also, i’m curious - are you using testnet or mainnet for this? and how are you generating your treasury and admin keys? those details might help narrow down the problem.

oh, and random thought - have you tried using the deprecated TokenCreateTransaction().setTokenMemo() method? i know it’s not recommended anymore, but i’ve seen some older tutorials still using it and it can cause weird errors if you’re following outdated examples.

let me know if any of that helps or if you want to bounce around some more ideas! nft minting can be tricky but it’s so cool when you finally get it working :smile:

3

I encountered a similar issue when working with Hedera Token Service. The INVALID_SIGNATURE error often stems from mismatched key pairs. Ensure your privateKey and publicKey are correctly associated and that you’re using the right account for signing.

One thing to check: Are you certain the privateKey you’re using for signing matches the admin key you’ve set for the token? If not, that could explain the signature error.

Also, verify that your client object is properly initialized with the correct network (testnet/mainnet) and account details. Misconfigurations here can lead to unexpected behavior.

Lastly, double-check your token parameters. Sometimes, invalid values in fields like tokenName or tokenSymbol can trigger signature errors. Ensure all your inputs meet Hedera’s requirements for token creation.

4

yo mia, i’ve been there too! make sure ur using the right account for signing. sometimes the INVALID_SIGNATURE pops up when the privateKey doesn’t match the adminKey. double check that.

also, verify ur client setup. wrong network or account deets can mess things up.

if ur still stuck, maybe share more of ur code? could help spot the issue. good luck with ur NFT project!