I’m having trouble with NFT creation using Hedera Token Service (HTS) and keep running into signature validation issues. Every time I try to mint a new NFT token, the system throws an invalid signature error.
I’ve been following the standard process for generating signatures but something seems to be wrong with my implementation. The error appears during the token creation step specifically.
Has anyone else encountered similar signature problems when working with HTS for NFT minting? I’m using the official SDK but the signature validation keeps failing. Any suggestions on what might be causing this issue or how to properly format the signature for NFT creation would be really helpful.
I’ve double-checked my private keys and account setup, but the signature verification still fails consistently.
hey, sounds like you might’ve missed the treasury account sig. for NFTs, you need both paying and treasury account signatures. also, double-check if ur on mainnet or testnet, mix-ups can cause signature issues. I faced this last month, drove me crazy till I caught the treasury sig mistake.
Had this exact problem three months ago with my NFT project. The fix was transaction freezing and signing order. You need to call freeze() on your transaction BEFORE generating the signature - that’s where I screwed up. The transaction has to be completely frozen before you do any signature stuff. Also check that your network config matches your account setup. I was mixing testnet credentials with mainnet endpoints like an idiot, which kept causing validation failures. Make sure your client config, account IDs, and private keys are all from the same network. The signature format should follow standard Ed25519, but timing matters too. If your system clock’s way off, timestamp validation will fail even with correct signatures.
Hey Isaac31, signature validation errors are so frustrating! I’ve hit similar issues before - usually something subtle.
Are you serializing the transaction before signing? Field order or encoding can mess everything up even with the right private key. What SDK version are you using? Newer versions changed signature formatting.
I’d log the raw transaction data right before signing - have you tried that? Also check if you’re using a different account ID format than the transaction expects.
What’s the exact error message? The wording usually hints at formatting vs other issues. Try a simple test transaction first (regular transfer) to see if signatures work for non-NFT operations.