Mining only p2wpkh txns

output.txt

@@ -1,6 +1,6 @@
-2000000000000000000000000000000000000000000000000000000000000000000000002523173839330bc5f136f4b5b17784604d27227645f2831feb5a0e64e195f0ac7f0c1466ffff001f0001086d
-010000000001010000000000000000000000000000000000000000000000000000000000000000ffffffff0403951a06ffffffff02a4de4125000000001976a9142c30a6aaac6d96687291475d7d52f4b469f665a688ac0000000000000000266a24aa21a9ed026385796235b3225e7b4417be377244371535b3717e332e1c0bbc5db2457c710120000000000000000000000000000000000000000000000000000000000000000000000000
-3bbb1bd963829caaf4ad2351db98a8cc39f18cafbd8ffbf3803627e3d64c7148
+20000000000000000000000000000000000000000000000000000000000000000000000047c7da17888a6de293e9a2ea4da7cff57533df2ad9cc1c483f8f8d992802c9792f101466ffff001f0004a0e2
+010000000001010000000000000000000000000000000000000000000000000000000000000000ffffffff0403951a06ffffffff02a4de4125000000001976a9142c30a6aaac6d96687291475d7d52f4b469f665a688ac0000000000000000266a24aa21a9ed52885e31e3822e0d515b45917847c59ba4b9dfc2a9311c962a7209c86e1aa14e0120000000000000000000000000000000000000000000000000000000000000000000000000
+84158f8f7c0edd7c195ea322cfd70a9a835d40c8e71bd12f9385fcc91f6d9241
 e6d870ecd3e78026506da94b80411048053758e2f8f248061b553bfe15e76392
 d683f4a8105bdbc816b5afb478845ebcddb8af1a3b24fdebbb1ec7b3e3fe0ddd
 e5c0a41f3cd0a84ffb9453018fa0fb4f97b730bb6c59ff330739f171810e75eb

src/main.cpp

@@ -38,6 +38,7 @@ void mine() {
 
     vector<string> blockTxns;
     vector<string> blockTxnIds;
+    vector<string> wTXIDs;
     int64_t reward = 625000000;
     uint32_t block_size = 80;
 
@@ -55,23 +56,17 @@ void mine() {
 
         if (block_size + ser_txn.size() < 1024*1024 && verify_txn(txn.second) >= 0) {
             blockTxns.push_back(ser_txn);
+            wTXIDs.push_back(hash256(get_wTXID(txn.second)));
             block_size += ser_txn.size();
             reward += txn.first;
         }
     }
 
     // Calculate TXIDs of all the transactions to be included in the block
-    for (string txn : blockTxns) {
-        char sha[SHA256_DIGEST_LENGTH];
-        SHA256((unsigned char*) txn.c_str(), txn.length(), (unsigned char*) sha);
-        SHA256((unsigned char*) sha, SHA256_DIGEST_LENGTH, (unsigned char*) sha);
-        string txid = "";
-        for (int i = 0; i < SHA256_DIGEST_LENGTH; i++)
-            txid.push_back(sha[i]);
-        blockTxnIds.push_back(txid);
-    }
+    for (string txn : blockTxns)
+        blockTxnIds.push_back(hash256(txn));
 
-    vector<string> wTXIDs = blockTxnIds;
+
     wTXIDs.push_back(string(32, 0));
     string wTXID_commitment = hash256(getMerkleRoot(wTXIDs) + string(32, 0));
     string coinbaseTxn = genCoinbaseTxn(reward, wTXID_commitment);

src/serialize.h

@@ -147,10 +147,7 @@ string get_wTXID (Json::Value txn) {
     }
 
     for (auto &inp : txn["vin"]) {
-        // string_view k = "witness";
-        // if (inp.find(k.begin(), k.end()) == k.end())
-        //     continue;
-        if (inp["witness"].empty())
+        if (!inp.isMember("witness"))
             continue;
 
         ser_txn += int2compact(inp["witness"].size());