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Iam using the bitcoinjs-lib library and trying to do a transaction. Iam doing the tx.addInput method before building but running into a build issue. I assume an error is thrown if blockchainScripthash_listunspent cannot retrieve the previous tx_hash.

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If not a coinbase transaction, you have to spend from an existing output. Thus the input must reference an existing transaction.

cannot retrieve the previous tx_hash

Maybe the library you are using is the following common semantic:

  • txid for the transaction id (hash without the witness data)
  • tx_hash for the transaction hash (hash with the witness data)

You want the txid to reference a previous transaction in an input.

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