testnet update: rename testnet3 to testnet

Update all references to 'testnet3' to 'testnet' for consistency. This includes:
- Changing magic bytes in network messages
- Updating directory paths and configuration files
- Modifying documentation and test framework references
- Adjusting chain parameters and validation logic

contrib/linearize/example-linearize.cfg

@@ -26,7 +26,7 @@ input=/home/example/.palladium/blocks
 # testnet
 #netmagic=0b110907
 #genesis=000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943
-#input=/home/example/.palladium/testnet3/blocks
+#input=/home/example/.palladium/testnet/blocks
 
 # regtest
 #netmagic=fabfb5da

doc/files.md

@@ -33,7 +33,7 @@ Windows  | `%APPDATA%\Palladium\` <sup>[\[1\]](#note1)</sup>
 Chain option        | Data directory path
 --------------------|--------------------
 no option (mainnet) | *path_to_datadir*`/`
-`-testnet`          | *path_to_datadir*`/testnet3/`
+`-testnet`          | *path_to_datadir*`/testnet/`
 `-regtest`          | *path_to_datadir*`/regtest/`
 
 ## Data directory layout

doc/release-process.md

@@ -377,13 +377,13 @@ Both variables are used as a guideline for how much space the user needs on thei
 Note that all values should be taken from a **fully synced** node and have an overhead of 5-10% added on top of its base value.
 
 To calculate `m_assumed_blockchain_size`:
-- For `mainnet` -> Take the size of the data directory, excluding `/regtest` and `/testnet3` directories.
-- For `testnet` -> Take the size of the `/testnet3` directory.
+- For `mainnet` -> Take the size of the data directory, excluding `/regtest` and `/testnet` directories.
+- For `testnet` -> Take the size of the `/testnet` directory.
 
 
 To calculate `m_assumed_chain_state_size`:
 - For `mainnet` -> Take the size of the `/chainstate` directory.
-- For `testnet` -> Take the size of the `/testnet3/chainstate` directory.
+- For `testnet` -> Take the size of the `/testnet/chainstate` directory.
 
 Notes:
 - When taking the size for `m_assumed_blockchain_size`, there's no need to exclude the `/chainstate` directory since it's a guideline value and an overhead will be added anyway.

src/chainparams.cpp

@@ -220,10 +220,10 @@ public:
 
    
 
-        pchMessageStart[0] = 0x0b;
-        pchMessageStart[1] = 0x11;
-        pchMessageStart[2] = 0x09;
-        pchMessageStart[3] = 0x07;
+        pchMessageStart[0] = 0x0c;
+        pchMessageStart[1] = 0x12;
+        pchMessageStart[2] = 0x0a;
+        pchMessageStart[3] = 0x08;
         nDefaultPort = 12333;
         nPruneAfterHeight = 1000;
         m_assumed_blockchain_size = 1;

src/chainparamsbase.cpp

@@ -38,7 +38,7 @@ std::unique_ptr<CBaseChainParams> CreateBaseChainParams(const std::string& chain
     if (chain == CBaseChainParams::MAIN)
         return MakeUnique<CBaseChainParams>("", 2332);
     else if (chain == CBaseChainParams::TESTNET)
-        return MakeUnique<CBaseChainParams>("testnet3", 12332);
+        return MakeUnique<CBaseChainParams>("testnet", 12332);
     else if (chain == CBaseChainParams::REGTEST)
         return MakeUnique<CBaseChainParams>("regtest", 12443);
     else

src/validation.cpp

@@ -2039,7 +2039,7 @@ bool CChainState::ConnectBlock(const CBlock& block, BlockValidationState& state,
     // edge case when manipulating the UTXO and it would be simpler not to have
     // another edge case to deal with.
 
-    // testnet3 has no blocks before the BIP34 height with indicated heights
+    // testnet has no blocks before the BIP34 height with indicated heights
     // post BIP34 before approximately height 486,000,000 and presumably will
     // be reset before it reaches block 1,983,702 and starts doing unnecessary
     // BIP30 checking again.

test/functional/p2p_dos_header_tree.py

@@ -20,13 +20,13 @@ import os
 class RejectLowDifficultyHeadersTest(PalladiumTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = True
-        self.chain = 'testnet3'  # Use testnet chain because it has an early checkpoint
+        self.chain = 'testnet'
         self.num_nodes = 2
 
     def add_options(self, parser):
         parser.add_argument(
             '--datafile',
-            default='data/blockheader_testnet3.hex',
+            default='data/blockheader_testnet.hex',
             help='Test data file (default: %(default)s)',
         )
 
@@ -36,7 +36,7 @@ class RejectLowDifficultyHeadersTest(PalladiumTestFramework):
         with open(self.headers_file_path, encoding='utf-8') as headers_data:
             h_lines = [l.strip() for l in headers_data.readlines()]
 
-        # The headers data is taken from testnet3 for early blocks from genesis until the first checkpoint. There are
+        # The headers data is taken from testnet for early blocks from genesis until the first checkpoint. There are
         # two headers with valid POW at height 1 and 2, forking off from genesis. They are indicated by the FORK_PREFIX.
         FORK_PREFIX = 'fork:'
         self.headers = [l for l in h_lines if not l.startswith(FORK_PREFIX)]

test/functional/test_framework/mininode.py

@@ -90,7 +90,7 @@ MESSAGEMAP = {
 
 MAGIC_BYTES = {
     "mainnet": b"\xf9\xbe\xb4\xd9",   # mainnet
-    "testnet3": b"\x0b\x11\x09\x07",  # testnet3
+    "testnet": b"\x0c\x12\x0a\x08",  # testnet
     "regtest": b"\xfa\xbf\xb5\xda",   # regtest
 }
 

test/functional/test_framework/util.py

@@ -302,7 +302,7 @@ def initialize_datadir(dirname, n, chain):
     if not os.path.isdir(datadir):
         os.makedirs(datadir)
     # Translate chain name to config name
-    if chain == 'testnet3':
+    if chain == 'testnet':
         chain_name_conf_arg = 'testnet'
         chain_name_conf_section = 'test'
     else: