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Nami does not implement a function to balance an unbalanced transaction. Therefore, the Nami demo of the Plutus Github repository implements this step (as a temporary workaround) in the function exports.balanceTxImpl = txCbor => () that can be found here: https://github.com/input-output-hk/plutus-apps/blob/main/plutus-pab/demo/pab-nami/client/src/Cardano/Wallet/Nami.js

Taking a closer look at this function, one notices that it just fetches some stuff and calls the Nami implementation for building the transaction:

return buildTx({ 'paymentAddr': changeAddrBech32 }, utxos, tx.body().outputs(), pp)

What surprised me was that the inputs of the unbalanced transaction are not passed to buildTx ! How can this work ? It works in the demo because it only implements a simple transaction where A transfers some funds to B. But in a more complicated transaction, there could be some script UTxOs in the inputs of the unbalanced transaction. How are these taken into account ? I have the impression that they are not. Am I missing something ?

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