Merge bitcoin/bitcoin#26349: rpc: make address field optional list{transactions, sinceblock} response

eb679a7896 rpc: make `address` field optional (w0xlt)

Pull request description:

  Close https://github.com/bitcoin/bitcoin/issues/26338.

  This PR makes optional the `address` field in the response of `listtransactions` and `listsinceblock` RPC.
  And adds two tests that fail on master, but not on this branch.

ACKs for top commit:
  achow101:
    ACK eb679a7896
  aureleoules:
    ACK eb679a7896

Tree-SHA512: b267439626e2ec3134ae790c849949a4c40ef0cebd20092e8187be3db0a61941b2da10bbbba92ca880b8369f46c1aaa806d057eaa5159325f65cbec7cb33c52f

src/wallet/rpc/transactions.cpp

@@ -447,7 +447,7 @@ RPCHelpMan listtransactions()
                         {RPCResult::Type::OBJ, "", "", Cat(Cat<std::vector<RPCResult>>(
                         {
                             {RPCResult::Type::BOOL, "involvesWatchonly", /*optional=*/true, "Only returns true if imported addresses were involved in transaction."},
-                            {RPCResult::Type::STR, "address", "The bitcoin address of the transaction."},
+                            {RPCResult::Type::STR, "address",  /*optional=*/true, "The bitcoin address of the transaction (not returned if the output does not have an address, e.g. OP_RETURN null data)."},
                             {RPCResult::Type::STR, "category", "The transaction category.\n"
                                 "\"send\"                  Transactions sent.\n"
                                 "\"receive\"               Non-coinbase transactions received.\n"
@@ -561,7 +561,7 @@ RPCHelpMan listsinceblock()
                             {RPCResult::Type::OBJ, "", "", Cat(Cat<std::vector<RPCResult>>(
                             {
                                 {RPCResult::Type::BOOL, "involvesWatchonly", /*optional=*/true, "Only returns true if imported addresses were involved in transaction."},
-                                {RPCResult::Type::STR, "address", "The bitcoin address of the transaction."},
+                                {RPCResult::Type::STR, "address",  /*optional=*/true, "The bitcoin address of the transaction (not returned if the output does not have an address, e.g. OP_RETURN null data)."},
                                 {RPCResult::Type::STR, "category", "The transaction category.\n"
                                     "\"send\"                  Transactions sent.\n"
                                     "\"receive\"               Non-coinbase transactions received.\n"

test/functional/wallet_listsinceblock.py

@@ -45,6 +45,7 @@ class ListSinceBlockTest(BitcoinTestFramework):
         if self.options.descriptors:
             self.test_desc()
         self.test_send_to_self()
+        self.test_op_return()
 
     def test_no_blockhash(self):
         self.log.info("Test no blockhash")
@@ -448,6 +449,19 @@ class ListSinceBlockTest(BitcoinTestFramework):
         assert any(c["address"] == addr for c in coins)
         assert all(self.nodes[2].getaddressinfo(c["address"])["ischange"] for c in coins)
 
+    def test_op_return(self):
+        """Test if OP_RETURN outputs will be displayed correctly."""
+        block_hash = self.nodes[2].getbestblockhash()
+
+        raw_tx = self.nodes[2].createrawtransaction([], [{'data': 'aa'}])
+        funded_tx = self.nodes[2].fundrawtransaction(raw_tx)
+        signed_tx = self.nodes[2].signrawtransactionwithwallet(funded_tx['hex'])
+        tx_id = self.nodes[2].sendrawtransaction(signed_tx['hex'])
+
+        op_ret_tx = [tx for tx in self.nodes[2].listsinceblock(blockhash=block_hash)["transactions"] if tx['txid'] == tx_id][0]
+
+        assert 'address' not in op_ret_tx
+
 
 if __name__ == '__main__':
     ListSinceBlockTest().main()

test/functional/wallet_listtransactions.py

@@ -109,6 +109,7 @@ class ListTransactionsTest(BitcoinTestFramework):
         self.run_rbf_opt_in_test()
         self.run_externally_generated_address_test()
         self.run_invalid_parameters_test()
+        self.test_op_return()
 
     def run_rbf_opt_in_test(self):
         """Test the opt-in-rbf flag for sent and received transactions."""
@@ -284,6 +285,17 @@ class ListTransactionsTest(BitcoinTestFramework):
         assert_raises_rpc_error(-8, "Negative count", self.nodes[0].listtransactions, count=-1)
         assert_raises_rpc_error(-8, "Negative from", self.nodes[0].listtransactions, skip=-1)
 
+    def test_op_return(self):
+        """Test if OP_RETURN outputs will be displayed correctly."""
+        raw_tx = self.nodes[0].createrawtransaction([], [{'data': 'aa'}])
+        funded_tx = self.nodes[0].fundrawtransaction(raw_tx)
+        signed_tx = self.nodes[0].signrawtransactionwithwallet(funded_tx['hex'])
+        tx_id = self.nodes[0].sendrawtransaction(signed_tx['hex'])
+
+        op_ret_tx = [tx for tx in self.nodes[0].listtransactions() if tx['txid'] == tx_id][0]
+
+        assert 'address' not in op_ret_tx
+
 
 if __name__ == '__main__':
     ListTransactionsTest().main()