Comments (1)
If you require a backend signature and a frontend signature, you should use tx.partialSignWithPrivateKey
which will return you the witnessSet instead of the signedTx.
After the user signs the transaction, you can assemble both witnesses and then I'm pretty sure the fee should be correct.
const userWitness = <user signature from the frontend>
const backendWitness = tx.partialSignWithPrivateKey(validatorKey);
const signedTx = await tx.assemble([userWitness, backendWitness]).complete()
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