Issue getting fromAddress from transaction

[Mebitek The manufactured eXPerience]

Hi all,

I'm trying to get the fromAddress of a given trasaction. I can calculate one but I have different values in front of the ones reported on blockchain.com explorer. Can someone help me?

bitcoinj version: 0.15.1

        Script scriptSig = inputTx.getScriptSig();

        List<ScriptChunk> chunks = scriptSig.getChunks();

        byte[] pubKey = chunks.get(chunks.size() - 1).data;

        assert pubKey != null;

        byte[] pubKeyHash = Utils.sha256hash160(pubKey);

        LegacyAddress fromAddress = LegacyAddress.fromPubKeyHash(np, pubKeyHash);

from blockchain.com explorer:

tx = f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16

fromAddress = 12cbQLTFMXRnSzktFkuoG3eHoMeFtpTu3S

I get: 1N6HfR4j5dnrBPpHET9ZmSwDhLkr5hprCG

for newer transactions, the result is good: tx: 1554a02d4eb1c7a73e3736922ed99530e360784e709896c42e5756e65b2da341 

can someone point me how to fix this?

thanks

Claudio

[Andreas Schildbach]

Generally it's not a good idea trying to derive a "from address".

Your code can only work in very specific cases (inputs spending P2PKH
outputs).

You should assert that chunks.size() == 2.

Also the example transaction is a BCH transaction. I'm not sure how
similar BCH is to Bitcoin these days -- better check with the BCH folks.

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[Mebitek The manufactured eXPerience]

thanks for your answer. what other cases should I find in a blockchain analisys?

how to manage that?

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