How to sign a transaction using an NCW with a chain not supported by Fireblocks

Developer Discussion
1

Hi, I am trying to make a transaction on a chain not supported by Fireblocks using a non-custodial wallet. I was able to generate an address using the method:

fireblocks
    .getPublicKeyInfo({
    algorithm: "MPC_EDDSA_ED25519",
    compressed: true,
    derivationPath,
    });

The derivationPath is defined as the chain I want to use. However, from what I see, to sign a transaction, I need to call the method createTransaction, which requires the assetId as an argument. I believe that while the assetId doesn’t exist, it will keep returning ‘asset not found’.

So, do I need to save the asset in wallet before trying to sign the transaction, or is there another way? Should I build the transaction outside of Fireblocks and just sign it? If so, how do I do this if the signTransaction(txId) method waits for a transaction to be in the “Pending Signature” state, which will never happen in this case because the transaction was not created in Fireblocks?

Could you provide me with some guidance?

2

Hi @yurivvdantas at the moment what you are trying to achieve is not supported by NCW. Our product team is working on releasing a get public key with derivation endpoint for NCW in due time.