Signing a Bitcoin SegWit transaction using bitcoinj

I’m working on a SegWit Bitcoin transaction, and I'm encountering an error when trying to broadcast it:

Code: -26, Error: mandatory-script-verify-flag-failed (Signature must be zero for failed CHECK(MULTI)SIG operation)

Here’s the code I’m using to sign the transaction:

private static void signInputsOfTransaction(Address sourceAddress, Transaction tx, ECKey key) { for (int i = 0; i < tx.getInputs().size(); i++) { Script scriptPubKey = ScriptBuilder.createP2WPKHOutputScript(key); Coin inputValue = tx.getInput(i).getValue(); Sha256Hash hash = tx.hashForWitnessSignature( i, scriptPubKey, inputValue, Transaction.SigHash.ALL, false ); ECKey.ECDSASignature ecdsaSignature = key.sign(hash); TransactionSignature txSignature = new TransactionSignature(ecdsaSignature, Transaction.SigHash.ALL, false); TransactionWitness witness = new TransactionWitness(2); witness.setPush(0, txSignature.encodeToBitcoin()); witness.setPush(1, key.getPubKey()); tx.getInput(i).setWitness(witness); tx.getInput(i).setScriptSig(ScriptBuilder.createEmpty()); } } 

Here’s the raw transaction hex I’m trying to broadcast:

010000000001011a34c12133e07aceb6b0cd254e2d9e12fde095b5a3afece4907945e36254e0d40100000000ffffffff02e803000000000000160014c9bf27c413655f5894a6a095ccfb5f1d291123f185170000000000001600146edda921d055dece3a894e39fd91a0c50faf675c02473044022000e9341c7c137529db50f706bc2bc1c1057674cda3bc33be5c559a45731b9c2802201a0f435a70e0f3a89d272efa407e0817e964f4c14ee9f9e3e4b5961fa658fc1d01210336069ac77986a9de47f0c371b682906149e43c2f51853b30d31132d1ec33b76900000000

I’ve decoded it using a Bitcoin transaction API (BlockCypher), and here’s the output:

{ "outputs": [ { "addresses": ["bc1qexlj03qnv404399x5z2ue76lr553zgl3kfx7va"], "script_type": "pay-to-witness-pubkey-hash", "value": 1000, "script": "0014c9bf27c413655f5894a6a095ccfb5f1d291123f1" }, { "addresses": ["bc1qdmw6jgws2h0vuw5ffculmydqc5867e6ulzzm97"], "script_type": "pay-to-witness-pubkey-hash", "value": 6021, "script": "00146edda921d055dece3a894e39fd91a0c50faf675c" } ], "addresses": [ "bc1qdmw6jgws2h0vuw5ffculmydqc5867e6ulzzm97", "bc1qexlj03qnv404399x5z2ue76lr553zgl3kfx7va" ], "fees": 1130, "ver": 1, "vsize": 141, "inputs": [{ "sequence": 4294967295, "witness": [ "3044022000e9341c7c137529db50f706bc2bc1c1057674cda3bc33be5c559a45731b9c2802201a0f435a70e0f3a89d272efa407e0817e964f4c14ee9f9e3e4b5961fa658fc1d01", "0336069ac77986a9de47f0c371b682906149e43c2f51853b30d31132d1ec33b769" ], "addresses": ["bc1qdmw6jgws2h0vuw5ffculmydqc5867e6ulzzm97"], "prev_hash": "d4e05462e3457990e4ecafa3b595e0fd129e2d4e25cdb0b6ce7ae03321c1341a", "output_value": 8151, "script_type": "pay-to-witness-pubkey-hash", "output_index": 1, "age": 698646 }], "preference": "low", "received": "2024-11-28T15:26:00.690177102Z", "block_height": -1, "confirmations": 0, "relayed_by": "189.37.69.88", "total": 7021, "size": 222, "block_index": -1, "double_spend": false, "vin_sz": 1, "hash": "0cafb57866d9a412e6cd0f806e03363baab1bdbf6434181ea5a927aa62930f77", "vout_sz": 2 } 

Is there something wrong with the way I’m signing or setting up the TransactionWitness?