Mining only 5 p2wpkh txns

SummerOfBitcoin · Apr 14, 2024 · e442043 · e442043
1 parent 29c2837
commit e442043
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Showing 4 changed files with 44 additions and 33 deletions.
diff --git a/bin/main b/bin/main
diff --git a/output.txt b/output.txt
@@ -1,6 +1,6 @@
-20000000000000000000000000000000000000000000000000000000000000000000000048700f542c26d305e4edb6dcfce3a96a9633928db09536fcf24d577037107bbba4111c66ffff001f00016636
-010000000001010000000000000000000000000000000000000000000000000000000000000000ffffffff0403951a06ffffffff027cc44025000000001976a9142c30a6aaac6d96687291475d7d52f4b469f665a688ac0000000000000000266a24aa21a9ed07a5e6e56a9a192f151526c40c80687e98f96aa294ed36e47ac45ef7e87118210120000000000000000000000000000000000000000000000000000000000000000000000000
-04ba8e35719b1041e0b25a304ca0ac179fb67a70a7267605fe6db6b43d334332
+2000000000000000000000000000000000000000000000000000000000000000000000003998aec10bc0c04f72fb204958ebaa03ad02f08becc212a928b94da35b27fcb6991b1c66ffff001f0000aa6d
+010000000001010000000000000000000000000000000000000000000000000000000000000000ffffffff0403951a06ffffffff027cc44025000000001976a9142c30a6aaac6d96687291475d7d52f4b469f665a688ac0000000000000000266a24aa21a9ed49a508272fe7d8e99dd04a97a46eb930e78330aadfb84ebb7efb4c8e9ba791a10120000000000000000000000000000000000000000000000000000000000000000000000000
+4c25d63ea0d359553599808c9b0ce15bccae06d9091eb6db7948a577a9c86842
 d46e76a0c8559b76ac00bf5a2f5df1aba3aa2fa8dcbfa9ab288027813b627f24
 4c6e1339f6ec894ac4685f4ef934180d376b1870005fb5c6298261353d46cbac
 141655b0e4239480afbdc12874e642ffeb94da72536ee4b8bace750820b26a06

diff --git a/src/main.cpp b/src/main.cpp
@@ -58,7 +58,7 @@ 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)));
+            wTXIDs.push_back(hash256(ser_wit(txn.second)));
             block_size += ser_txn.size();
             reward += txn.first;
 
@@ -73,11 +73,6 @@ void mine() {
 
 
     wTXIDs.push_back(string(32, 0));
-    for (auto it = wTXIDs.rbegin(); it != wTXIDs.rend(); it++) {
-        reverse(it->begin(), it->end());
-        cout << bstr2hexstr(*it, (*it).length()) << endl;
-        reverse(it->begin(), it->end());
-    }
     string wTXID_commitment = hash256(getMerkleRoot(wTXIDs) + string(32, 0));
     string coinbaseTxn = genCoinbaseTxn(reward, wTXID_commitment);
     block_size += coinbaseTxn.size();

diff --git a/src/serialize.h b/src/serialize.h
@@ -119,9 +119,9 @@ string int2compact (uint64_t num) {
     return comp;
 }
 
-string get_wTXID (Json::Value txn) {
+string serialize_txn (Json::Value txn, bool isCleared = false) {
     string ser_txn = "";
-
+    
     ser_txn += int2bin(txn["version"].asUInt());
     ser_txn += int2compact(txn["vin"].size());
 
@@ -132,9 +132,14 @@ string get_wTXID (Json::Value txn) {
         ser_txn += txid;
         ser_txn += int2bin(inp["vout"].asUInt());
 
-        ser_txn += int2compact(inp["scriptsig"].asString().length()/2);
-        ser_txn += hexstr2bstr(inp["scriptsig"].asString());
-
+        if (isCleared) {
+            ser_txn += int2compact(inp["prevout"]["scriptpubkey"].asString().length()/2);
+            ser_txn += hexstr2bstr(inp["prevout"]["scriptpubkey"].asString());
+        }
+        else {
+            ser_txn += int2compact(inp["scriptsig"].asString().length()/2);
+            ser_txn += hexstr2bstr(inp["scriptsig"].asString());
+        }
         ser_txn += int2bin(inp["sequence"].asUInt());
     }
 
@@ -146,24 +151,28 @@ string get_wTXID (Json::Value txn) {
         ser_txn += hexstr2bstr(out["scriptpubkey"].asString());
     }
 
-    for (auto &inp : txn["vin"]) {
-        if (!inp.isMember("witness"))
-            continue;
-
-        ser_txn += int2compact(inp["witness"].size());
-        for (auto &wit : inp["witness"])
-            ser_txn += int2compact(wit.asString().length()/2) + hexstr2bstr(wit.asString());
-    }
-
     ser_txn += int2bin(txn["locktime"].asUInt());
 
     return ser_txn;
 }
 
-string serialize_txn (Json::Value txn, bool isCleared = false) {
+
+string ser_wit (Json::Value txn) {
+    bool no_witness = true;
+    for (auto &inp : txn["vin"]) {
+        if (inp.isMember("witness")) {
+            no_witness = false;
+            break;
+        }
+    }
+    if (no_witness)
+        return serialize_txn(txn);
+
     string ser_txn = "";
-    
+
     ser_txn += int2bin(txn["version"].asUInt());
+    ser_txn += int2compact(0);      // Marker for segwit
+    ser_txn += int2compact(1);      // Flag for segwit
     ser_txn += int2compact(txn["vin"].size());
 
     for (auto &inp : txn["vin"]) {
@@ -173,14 +182,9 @@ string serialize_txn (Json::Value txn, bool isCleared = false) {
         ser_txn += txid;
         ser_txn += int2bin(inp["vout"].asUInt());
 
-        if (isCleared) {
-            ser_txn += int2compact(inp["prevout"]["scriptpubkey"].asString().length()/2);
-            ser_txn += hexstr2bstr(inp["prevout"]["scriptpubkey"].asString());
-        }
-        else {
-            ser_txn += int2compact(inp["scriptsig"].asString().length()/2);
-            ser_txn += hexstr2bstr(inp["scriptsig"].asString());
-        }
+        ser_txn += int2compact(inp["scriptsig"].asString().length()/2);
+        ser_txn += hexstr2bstr(inp["scriptsig"].asString());
+
         ser_txn += int2bin(inp["sequence"].asUInt());
     }
 
@@ -192,11 +196,23 @@ string serialize_txn (Json::Value txn, bool isCleared = false) {
         ser_txn += hexstr2bstr(out["scriptpubkey"].asString());
     }
 
+    for (auto &inp : txn["vin"]) {
+        if (!inp.isMember("witness")) {
+            ser_txn += int2compact(0);
+            continue;
+        }
+
+        ser_txn += int2compact(inp["witness"].size());
+        for (auto &wit : inp["witness"])
+            ser_txn += int2compact(wit.asString().length()/2) + hexstr2bstr(wit.asString());
+    }
+
     ser_txn += int2bin(txn["locktime"].asUInt());
 
     return ser_txn;
 }
 
+
 string serialize_segwit_1 (Json::Value txn) {
     string serialized = "";