New answers tagged bitcoinj
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Script redeemScript = ScriptBuilder.createP2WPKHOutputScript(key);
Script witnessScript = ScriptBuilder.createP2PKHOutputScript(key);
TransactionSignature signature = tx.calculateWitnessSignature(inputIndex, key, witnessScript, txIn.getValue(), SigHash.ALL,
false);
txIn.setWitness(TransactionWitness.redeemP2WPKH(signature, key));
txIn....
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