diff --git a/src/seeder/bitcoin.cpp b/src/seeder/bitcoin.cpp
index 8f8473865..897421f54 100644
--- a/src/seeder/bitcoin.cpp
+++ b/src/seeder/bitcoin.cpp
@@ -1,352 +1,345 @@
 // Copyright (c) 2017-2019 The Bitcoin developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <seeder/bitcoin.h>
 
 #include <hash.h>
 #include <netbase.h>
 #include <seeder/db.h>
 #include <serialize.h>
 #include <uint256.h>
 
 #include <algorithm>
 
 // Weither we are on testnet or mainnet.
 bool fTestNet;
 
 // The network magic to use.
 CMessageHeader::MessageMagic netMagic = {{0xe3, 0xe1, 0xf3, 0xe8}};
 
 #define BITCOIN_SEED_NONCE 0x0539a019ca550825ULL
 
 static const uint32_t allones(-1);
 
 void CSeederNode::BeginMessage(const char *pszCommand) {
     if (nHeaderStart != allones) {
         AbortMessage();
     }
     nHeaderStart = vSend.size();
     vSend << CMessageHeader(netMagic, pszCommand, 0);
     nMessageStart = vSend.size();
     // fprintf(stdout, "%s: SEND %s\n", ToString(you).c_str(), pszCommand);
 }
 
 void CSeederNode::AbortMessage() {
     if (nHeaderStart == allones) {
         return;
     }
     vSend.resize(nHeaderStart);
     nHeaderStart = allones;
     nMessageStart = allones;
 }
 
 void CSeederNode::EndMessage() {
     if (nHeaderStart == allones) {
         return;
     }
     uint32_t nSize = vSend.size() - nMessageStart;
     memcpy((char *)&vSend[nHeaderStart] +
                offsetof(CMessageHeader, nMessageSize),
            &nSize, sizeof(nSize));
     if (vSend.GetVersion() >= 209) {
         uint256 hash = Hash(vSend.begin() + nMessageStart, vSend.end());
         unsigned int nChecksum = 0;
         memcpy(&nChecksum, &hash, sizeof(nChecksum));
         assert(nMessageStart - nHeaderStart >=
                offsetof(CMessageHeader, pchChecksum) + sizeof(nChecksum));
         memcpy((char *)&vSend[nHeaderStart] +
                    offsetof(CMessageHeader, pchChecksum),
                &nChecksum, sizeof(nChecksum));
     }
     nHeaderStart = allones;
     nMessageStart = allones;
 }
 
 void CSeederNode::Send() {
     if (sock == INVALID_SOCKET) {
         return;
     }
     if (vSend.empty()) {
         return;
     }
     int nBytes = send(sock, &vSend[0], vSend.size(), 0);
     if (nBytes > 0) {
         vSend.erase(vSend.begin(), vSend.begin() + nBytes);
     } else {
         close(sock);
         sock = INVALID_SOCKET;
     }
 }
 
 void CSeederNode::PushVersion() {
     int64_t nTime = time(nullptr);
     uint64_t nLocalNonce = BITCOIN_SEED_NONCE;
     int64_t nLocalServices = 0;
     CService myService;
     CAddress me(myService, ServiceFlags(NODE_NETWORK | NODE_BITCOIN_CASH));
     BeginMessage("version");
     int nBestHeight = GetRequireHeight();
     std::string ver = "/bitcoin-cash-seeder:0.15/";
     vSend << PROTOCOL_VERSION << nLocalServices << nTime << you << me
           << nLocalNonce << ver << nBestHeight;
     EndMessage();
 }
 
 void CSeederNode::GotVersion() {
     // fprintf(stdout, "\n%s: version %i\n", ToString(you).c_str(),
     // nVersion);
     if (vAddr) {
         BeginMessage("getaddr");
         EndMessage();
         doneAfter = time(nullptr) + GetTimeout();
     } else {
         doneAfter = time(nullptr) + 1;
     }
 }
 
 bool CSeederNode::ProcessMessage(std::string strCommand, CDataStream &recv) {
     // fprintf(stdout, "%s: RECV %s\n", ToString(you).c_str(),
     // strCommand.c_str());
     if (strCommand == "version") {
         int64_t nTime;
         CAddress addrMe;
         CAddress addrFrom;
         uint64_t nNonce = 1;
         uint64_t nServiceInt;
         recv >> nVersion >> nServiceInt >> nTime >> addrMe;
         you.nServices = ServiceFlags(nServiceInt);
-        if (nVersion == 10300) nVersion = 300;
-        if (nVersion >= 106 && !recv.empty()) recv >> addrFrom >> nNonce;
-        if (nVersion >= 106 && !recv.empty()) recv >> strSubVer;
-        if (nVersion >= 209 && !recv.empty()) recv >> nStartingHeight;
+        recv >> addrFrom >> nNonce;
+        recv >> strSubVer;
+        recv >> nStartingHeight;
 
-        if (nVersion >= 209) {
-            BeginMessage("verack");
-            EndMessage();
-        }
+        BeginMessage("verack");
+        EndMessage();
         vSend.SetVersion(std::min(nVersion, PROTOCOL_VERSION));
-        if (nVersion < 209) {
-            vRecv.SetVersion(std::min(nVersion, PROTOCOL_VERSION));
-            GotVersion();
-        }
         return false;
     }
 
     if (strCommand == "verack") {
         vRecv.SetVersion(std::min(nVersion, PROTOCOL_VERSION));
         GotVersion();
         return false;
     }
 
     if (strCommand == "addr" && vAddr) {
         std::vector<CAddress> vAddrNew;
         recv >> vAddrNew;
         // fprintf(stdout, "%s: got %i addresses\n", ToString(you).c_str(),
         //        (int)vAddrNew.size());
         int64_t now = time(nullptr);
         std::vector<CAddress>::iterator it = vAddrNew.begin();
         if (vAddrNew.size() > 1) {
             if (doneAfter == 0 || doneAfter > now + 1) doneAfter = now + 1;
         }
         while (it != vAddrNew.end()) {
             CAddress &addr = *it;
             // fprintf(stdout, "%s: got address %s\n",
             // ToString(you).c_str(),
             //        addr.ToString().c_str(), (int)(vAddr->size()));
             it++;
             if (addr.nTime <= 100000000 || addr.nTime > now + 600) {
                 addr.nTime = now - 5 * 86400;
             }
             if (addr.nTime > now - 604800) {
                 vAddr->push_back(addr);
             }
             // fprintf(stdout, "%s: added address %s (#%i)\n",
             // ToString(you).c_str(),
             //        addr.ToString().c_str(), (int)(vAddr->size()));
             if (vAddr->size() > 1000) {
                 doneAfter = 1;
                 return true;
             }
         }
         return false;
     }
 
     return false;
 }
 
 bool CSeederNode::ProcessMessages() {
     if (vRecv.empty()) {
         return false;
     }
 
     do {
         CDataStream::iterator pstart = std::search(
             vRecv.begin(), vRecv.end(), BEGIN(netMagic), END(netMagic));
         uint32_t nHeaderSize = GetSerializeSize(
             CMessageHeader(netMagic), vRecv.GetType(), vRecv.GetVersion());
         if (vRecv.end() - pstart < nHeaderSize) {
             if (vRecv.size() > nHeaderSize) {
                 vRecv.erase(vRecv.begin(), vRecv.end() - nHeaderSize);
             }
             break;
         }
         vRecv.erase(vRecv.begin(), pstart);
         std::vector<char> vHeaderSave(vRecv.begin(),
                                       vRecv.begin() + nHeaderSize);
         CMessageHeader hdr(netMagic);
         vRecv >> hdr;
         if (!hdr.IsValidWithoutConfig(netMagic)) {
             // fprintf(stdout, "%s: BAD (invalid header)\n",
             // ToString(you).c_str());
             ban = 100000;
             return true;
         }
         std::string strCommand = hdr.GetCommand();
         unsigned int nMessageSize = hdr.nMessageSize;
         if (nMessageSize > MAX_SIZE) {
             // fprintf(stdout, "%s: BAD (message too large)\n",
             // ToString(you).c_str());
             ban = 100000;
             return true;
         }
         if (nMessageSize > vRecv.size()) {
             vRecv.insert(vRecv.begin(), vHeaderSave.begin(), vHeaderSave.end());
             break;
         }
         if (vRecv.GetVersion() >= 209) {
             uint256 hash = Hash(vRecv.begin(), vRecv.begin() + nMessageSize);
             if (memcmp(hash.begin(), hdr.pchChecksum,
                        CMessageHeader::CHECKSUM_SIZE) != 0) {
                 continue;
             }
         }
         CDataStream vMsg(vRecv.begin(), vRecv.begin() + nMessageSize,
                          vRecv.GetType(), vRecv.GetVersion());
         vRecv.ignore(nMessageSize);
         if (ProcessMessage(strCommand, vMsg)) {
             return true;
         }
         // fprintf(stdout, "%s: done processing %s\n",
         // ToString(you).c_str(),
         //        strCommand.c_str());
     } while (1);
     return false;
 }
 
 CSeederNode::CSeederNode(const CService &ip, std::vector<CAddress> *vAddrIn)
     : sock(INVALID_SOCKET), vSend(SER_NETWORK, 0), vRecv(SER_NETWORK, 0),
       nHeaderStart(-1), nMessageStart(-1), nVersion(0), vAddr(vAddrIn), ban(0),
       doneAfter(0), you(ip, ServiceFlags(NODE_NETWORK | NODE_BITCOIN_CASH)) {
     if (time(nullptr) > 1329696000) {
         vSend.SetVersion(209);
         vRecv.SetVersion(209);
     }
 }
 
 bool CSeederNode::Run() {
     // FIXME: This logic is duplicated with CConnman::ConnectNode for no
     // good reason.
     bool connected = false;
     proxyType proxy;
 
     if (you.IsValid()) {
         bool proxyConnectionFailed = false;
 
         if (GetProxy(you.GetNetwork(), proxy)) {
             sock = CreateSocket(proxy.proxy);
             if (sock == INVALID_SOCKET) {
                 return false;
             }
             connected = ConnectThroughProxy(
                 proxy, you.ToStringIP(), you.GetPort(), sock, nConnectTimeout,
                 &proxyConnectionFailed);
         } else {
             // no proxy needed (none set for target network)
             sock = CreateSocket(you);
             if (sock == INVALID_SOCKET) {
                 return false;
             }
             // no proxy needed (none set for target network)
             connected = ConnectSocketDirectly(you, sock, nConnectTimeout, true);
         }
     }
 
     if (!connected) {
         // fprintf(stdout, "Cannot connect to %s\n", ToString(you).c_str());
         CloseSocket(sock);
         return false;
     }
 
     PushVersion();
     Send();
 
     bool res = true;
     int64_t now;
     while (now = time(nullptr), ban == 0 &&
                                     (doneAfter == 0 || doneAfter > now) &&
                                     sock != INVALID_SOCKET) {
         char pchBuf[0x10000];
         fd_set set;
         FD_ZERO(&set);
         FD_SET(sock, &set);
         struct timeval wa;
         if (doneAfter) {
             wa.tv_sec = doneAfter - now;
             wa.tv_usec = 0;
         } else {
             wa.tv_sec = GetTimeout();
             wa.tv_usec = 0;
         }
         int ret = select(sock + 1, &set, nullptr, &set, &wa);
         if (ret != 1) {
             if (!doneAfter) res = false;
             break;
         }
         int nBytes = recv(sock, pchBuf, sizeof(pchBuf), 0);
         int nPos = vRecv.size();
         if (nBytes > 0) {
             vRecv.resize(nPos + nBytes);
             memcpy(&vRecv[nPos], pchBuf, nBytes);
         } else if (nBytes == 0) {
             // fprintf(stdout, "%s: BAD (connection closed prematurely)\n",
             //        ToString(you).c_str());
             res = false;
             break;
         } else {
             // fprintf(stdout, "%s: BAD (connection error)\n",
             // ToString(you).c_str());
             res = false;
             break;
         }
         ProcessMessages();
         Send();
     }
     if (sock == INVALID_SOCKET) res = false;
     close(sock);
     sock = INVALID_SOCKET;
     return (ban == 0) && res;
 }
 
 bool TestNode(const CService &cip, int &ban, int &clientV,
               std::string &clientSV, int &blocks,
               std::vector<CAddress> *vAddr) {
     try {
         CSeederNode node(cip, vAddr);
         bool ret = node.Run();
         if (!ret) {
             ban = node.GetBan();
         } else {
             ban = 0;
         }
         clientV = node.GetClientVersion();
         clientSV = node.GetClientSubVersion();
         blocks = node.GetStartingHeight();
         // fprintf(stdout, "%s: %s!!!\n", cip.ToString().c_str(), ret ? "GOOD" :
         // "BAD");
         return ret;
     } catch (std::ios_base::failure &e) {
         ban = 0;
         return false;
     }
 }
diff --git a/test/functional/test_framework/messages.py b/test/functional/test_framework/messages.py
index 1bf508f10..738098484 100755
--- a/test/functional/test_framework/messages.py
+++ b/test/functional/test_framework/messages.py
@@ -1,1330 +1,1319 @@
 #!/usr/bin/env python3
 # Copyright (c) 2010 ArtForz -- public domain half-a-node
 # Copyright (c) 2012 Jeff Garzik
 # Copyright (c) 2010-2019 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Bitcoin test framework primitive and message structures
 
 CBlock, CTransaction, CBlockHeader, CTxIn, CTxOut, etc....:
     data structures that should map to corresponding structures in
     bitcoin/primitives
 
 msg_block, msg_tx, msg_headers, etc.:
     data structures that represent network messages
 
 ser_*, deser_*: functions that handle serialization/deserialization.
 
 Classes use __slots__ to ensure extraneous attributes aren't accidentally added
 by tests, compromising their intended effect.
 """
 from codecs import encode
 import copy
 import hashlib
 from io import BytesIO
 import random
 import socket
 import struct
 import time
 
 from test_framework.siphash import siphash256
 from test_framework.util import hex_str_to_bytes
 
 MIN_VERSION_SUPPORTED = 60001
 # past bip-31 for ping/pong
 MY_VERSION = 70014
 MY_SUBVERSION = b"/python-mininode-tester:0.0.3/"
 # from version 70001 onwards, fRelay should be appended to version messages (BIP37)
 MY_RELAY = 1
 
 MAX_INV_SZ = 50000
 MAX_BLOCK_BASE_SIZE = 1000000
 
 # 1 BCH in satoshis
 COIN = 100000000
 
 NODE_NETWORK = (1 << 0)
 # NODE_GETUTXO = (1 << 1)
 NODE_BLOOM = (1 << 2)
 # NODE_WITNESS = (1 << 3)
 NODE_XTHIN = (1 << 4)
 NODE_BITCOIN_CASH = (1 << 5)
 NODE_NETWORK_LIMITED = (1 << 10)
 
 MSG_TX = 1
 MSG_BLOCK = 2
 MSG_TYPE_MASK = 0xffffffff >> 2
 
 # Serialization/deserialization tools
 
 
 def sha256(s):
     return hashlib.new('sha256', s).digest()
 
 
 def ripemd160(s):
     return hashlib.new('ripemd160', s).digest()
 
 
 def hash256(s):
     return sha256(sha256(s))
 
 
 def ser_compact_size(l):
     r = b""
     if l < 253:
         r = struct.pack("B", l)
     elif l < 0x10000:
         r = struct.pack("<BH", 253, l)
     elif l < 0x100000000:
         r = struct.pack("<BI", 254, l)
     else:
         r = struct.pack("<BQ", 255, l)
     return r
 
 
 def deser_compact_size(f):
     nit = struct.unpack("<B", f.read(1))[0]
     if nit == 253:
         nit = struct.unpack("<H", f.read(2))[0]
     elif nit == 254:
         nit = struct.unpack("<I", f.read(4))[0]
     elif nit == 255:
         nit = struct.unpack("<Q", f.read(8))[0]
     return nit
 
 
 def deser_string(f):
     nit = deser_compact_size(f)
     return f.read(nit)
 
 
 def ser_string(s):
     return ser_compact_size(len(s)) + s
 
 
 def deser_uint256(f):
     r = 0
     for i in range(8):
         t = struct.unpack("<I", f.read(4))[0]
         r += t << (i * 32)
     return r
 
 
 def ser_uint256(u):
     rs = b""
     for i in range(8):
         rs += struct.pack("<I", u & 0xFFFFFFFF)
         u >>= 32
     return rs
 
 
 def uint256_from_str(s):
     r = 0
     t = struct.unpack("<IIIIIIII", s[:32])
     for i in range(8):
         r += t[i] << (i * 32)
     return r
 
 
 def uint256_from_compact(c):
     nbytes = (c >> 24) & 0xFF
     v = (c & 0xFFFFFF) << (8 * (nbytes - 3))
     return v
 
 
 def deser_vector(f, c):
     nit = deser_compact_size(f)
     r = []
     for i in range(nit):
         t = c()
         t.deserialize(f)
         r.append(t)
     return r
 
 
 # ser_function_name: Allow for an alternate serialization function on the
 # entries in the vector.
 def ser_vector(l, ser_function_name=None):
     r = ser_compact_size(len(l))
     for i in l:
         if ser_function_name:
             r += getattr(i, ser_function_name)()
         else:
             r += i.serialize()
     return r
 
 
 def deser_uint256_vector(f):
     nit = deser_compact_size(f)
     r = []
     for i in range(nit):
         t = deser_uint256(f)
         r.append(t)
     return r
 
 
 def ser_uint256_vector(l):
     r = ser_compact_size(len(l))
     for i in l:
         r += ser_uint256(i)
     return r
 
 
 def deser_string_vector(f):
     nit = deser_compact_size(f)
     r = []
     for i in range(nit):
         t = deser_string(f)
         r.append(t)
     return r
 
 
 def ser_string_vector(l):
     r = ser_compact_size(len(l))
     for sv in l:
         r += ser_string(sv)
     return r
 
 
 # Deserialize from a hex string representation (eg from RPC)
 
 
 def FromHex(obj, hex_string):
     obj.deserialize(BytesIO(hex_str_to_bytes(hex_string)))
     return obj
 
 # Convert a binary-serializable object to hex (eg for submission via RPC)
 
 
 def ToHex(obj):
     return obj.serialize().hex()
 
 # Objects that map to bitcoind objects, which can be serialized/deserialized
 
 
 class CAddress:
     __slots__ = ("ip", "nServices", "pchReserved", "port", "time")
 
     def __init__(self):
         self.time = 0
         self.nServices = 1
         self.pchReserved = b"\x00" * 10 + b"\xff" * 2
         self.ip = "0.0.0.0"
         self.port = 0
 
     def deserialize(self, f, with_time=True):
         if with_time:
             self.time = struct.unpack("<i", f.read(4))[0]
         self.nServices = struct.unpack("<Q", f.read(8))[0]
         self.pchReserved = f.read(12)
         self.ip = socket.inet_ntoa(f.read(4))
         self.port = struct.unpack(">H", f.read(2))[0]
 
     def serialize(self, with_time=True):
         r = b""
         if with_time:
             r += struct.pack("<i", self.time)
         r += struct.pack("<Q", self.nServices)
         r += self.pchReserved
         r += socket.inet_aton(self.ip)
         r += struct.pack(">H", self.port)
         return r
 
     def __repr__(self):
         return "CAddress(nServices={} ip={} port={})".format(
             self.nServices, self.ip, self.port)
 
 
 class CInv:
     __slots__ = ("hash", "type")
 
     typemap = {
         0: "Error",
         1: "TX",
         2: "Block",
         4: "CompactBlock"
     }
 
     def __init__(self, t=0, h=0):
         self.type = t
         self.hash = h
 
     def deserialize(self, f):
         self.type = struct.unpack("<i", f.read(4))[0]
         self.hash = deser_uint256(f)
 
     def serialize(self):
         r = b""
         r += struct.pack("<i", self.type)
         r += ser_uint256(self.hash)
         return r
 
     def __repr__(self):
         return "CInv(type={} hash={:064x})".format(
             self.typemap[self.type], self.hash)
 
 
 class CBlockLocator:
     __slots__ = ("nVersion", "vHave")
 
     def __init__(self):
         self.nVersion = MY_VERSION
         self.vHave = []
 
     def deserialize(self, f):
         self.nVersion = struct.unpack("<i", f.read(4))[0]
         self.vHave = deser_uint256_vector(f)
 
     def serialize(self):
         r = b""
         r += struct.pack("<i", self.nVersion)
         r += ser_uint256_vector(self.vHave)
         return r
 
     def __repr__(self):
         return "CBlockLocator(nVersion={} vHave={})".format(
             self.nVersion, repr(self.vHave))
 
 
 class COutPoint:
     __slots__ = ("hash", "n")
 
     def __init__(self, hash=0, n=0):
         self.hash = hash
         self.n = n
 
     def deserialize(self, f):
         self.hash = deser_uint256(f)
         self.n = struct.unpack("<I", f.read(4))[0]
 
     def serialize(self):
         r = b""
         r += ser_uint256(self.hash)
         r += struct.pack("<I", self.n)
         return r
 
     def __repr__(self):
         return "COutPoint(hash={:064x} n={})".format(self.hash, self.n)
 
 
 class CTxIn:
     __slots__ = ("nSequence", "prevout", "scriptSig")
 
     def __init__(self, outpoint=None, scriptSig=b"", nSequence=0):
         if outpoint is None:
             self.prevout = COutPoint()
         else:
             self.prevout = outpoint
         self.scriptSig = scriptSig
         self.nSequence = nSequence
 
     def deserialize(self, f):
         self.prevout = COutPoint()
         self.prevout.deserialize(f)
         self.scriptSig = deser_string(f)
         self.nSequence = struct.unpack("<I", f.read(4))[0]
 
     def serialize(self):
         r = b""
         r += self.prevout.serialize()
         r += ser_string(self.scriptSig)
         r += struct.pack("<I", self.nSequence)
         return r
 
     def __repr__(self):
         return "CTxIn(prevout={} scriptSig={} nSequence={})".format(
             repr(self.prevout), self.scriptSig.hex(), self.nSequence)
 
 
 class CTxOut:
     __slots__ = ("nValue", "scriptPubKey")
 
     def __init__(self, nValue=0, scriptPubKey=b""):
         self.nValue = nValue
         self.scriptPubKey = scriptPubKey
 
     def deserialize(self, f):
         self.nValue = struct.unpack("<q", f.read(8))[0]
         self.scriptPubKey = deser_string(f)
 
     def serialize(self):
         r = b""
         r += struct.pack("<q", self.nValue)
         r += ser_string(self.scriptPubKey)
         return r
 
     def __repr__(self):
         return "CTxOut(nValue={}.{:08d} scriptPubKey={})".format(
             self.nValue // COIN, self.nValue % COIN, self.scriptPubKey.hex())
 
 
 class CTransaction:
     __slots__ = ("hash", "nLockTime", "nVersion", "sha256", "vin", "vout")
 
     def __init__(self, tx=None):
         if tx is None:
             self.nVersion = 1
             self.vin = []
             self.vout = []
             self.nLockTime = 0
             self.sha256 = None
             self.hash = None
         else:
             self.nVersion = tx.nVersion
             self.vin = copy.deepcopy(tx.vin)
             self.vout = copy.deepcopy(tx.vout)
             self.nLockTime = tx.nLockTime
             self.sha256 = tx.sha256
             self.hash = tx.hash
 
     def deserialize(self, f):
         self.nVersion = struct.unpack("<i", f.read(4))[0]
         self.vin = deser_vector(f, CTxIn)
         self.vout = deser_vector(f, CTxOut)
         self.nLockTime = struct.unpack("<I", f.read(4))[0]
         self.sha256 = None
         self.hash = None
 
     def billable_size(self):
         """
         Returns the size used for billing the against the transaction
         """
         return len(self.serialize())
 
     def serialize(self):
         r = b""
         r += struct.pack("<i", self.nVersion)
         r += ser_vector(self.vin)
         r += ser_vector(self.vout)
         r += struct.pack("<I", self.nLockTime)
         return r
 
     # Recalculate the txid
     def rehash(self):
         self.sha256 = None
         self.calc_sha256()
         return self.hash
 
     # self.sha256 and self.hash -- those are expected to be the txid.
     def calc_sha256(self):
         if self.sha256 is None:
             self.sha256 = uint256_from_str(hash256(self.serialize()))
         self.hash = encode(
             hash256(self.serialize())[::-1], 'hex_codec').decode('ascii')
 
     def get_id(self):
         # For now, just forward the hash.
         self.calc_sha256()
         return self.hash
 
     def is_valid(self):
         self.calc_sha256()
         for tout in self.vout:
             if tout.nValue < 0 or tout.nValue > 21000000 * COIN:
                 return False
         return True
 
     def __repr__(self):
         return "CTransaction(nVersion={} vin={} vout={} nLockTime={})".format(
             self.nVersion, repr(self.vin), repr(self.vout), self.nLockTime)
 
 
 class CBlockHeader:
     __slots__ = ("hash", "hashMerkleRoot", "hashPrevBlock", "nBits", "nNonce",
                  "nTime", "nVersion", "sha256")
 
     def __init__(self, header=None):
         if header is None:
             self.set_null()
         else:
             self.nVersion = header.nVersion
             self.hashPrevBlock = header.hashPrevBlock
             self.hashMerkleRoot = header.hashMerkleRoot
             self.nTime = header.nTime
             self.nBits = header.nBits
             self.nNonce = header.nNonce
             self.sha256 = header.sha256
             self.hash = header.hash
             self.calc_sha256()
 
     def set_null(self):
         self.nVersion = 1
         self.hashPrevBlock = 0
         self.hashMerkleRoot = 0
         self.nTime = 0
         self.nBits = 0
         self.nNonce = 0
         self.sha256 = None
         self.hash = None
 
     def deserialize(self, f):
         self.nVersion = struct.unpack("<i", f.read(4))[0]
         self.hashPrevBlock = deser_uint256(f)
         self.hashMerkleRoot = deser_uint256(f)
         self.nTime = struct.unpack("<I", f.read(4))[0]
         self.nBits = struct.unpack("<I", f.read(4))[0]
         self.nNonce = struct.unpack("<I", f.read(4))[0]
         self.sha256 = None
         self.hash = None
 
     def serialize(self):
         r = b""
         r += struct.pack("<i", self.nVersion)
         r += ser_uint256(self.hashPrevBlock)
         r += ser_uint256(self.hashMerkleRoot)
         r += struct.pack("<I", self.nTime)
         r += struct.pack("<I", self.nBits)
         r += struct.pack("<I", self.nNonce)
         return r
 
     def calc_sha256(self):
         if self.sha256 is None:
             r = b""
             r += struct.pack("<i", self.nVersion)
             r += ser_uint256(self.hashPrevBlock)
             r += ser_uint256(self.hashMerkleRoot)
             r += struct.pack("<I", self.nTime)
             r += struct.pack("<I", self.nBits)
             r += struct.pack("<I", self.nNonce)
             self.sha256 = uint256_from_str(hash256(r))
             self.hash = encode(hash256(r)[::-1], 'hex_codec').decode('ascii')
 
     def rehash(self):
         self.sha256 = None
         self.calc_sha256()
         return self.sha256
 
     def __repr__(self):
         return "CBlockHeader(nVersion={} hashPrevBlock={:064x} hashMerkleRoot={:064x} nTime={} nBits={:08x} nNonce={:08x})".format(
             self.nVersion, self.hashPrevBlock, self.hashMerkleRoot,
             time.ctime(self.nTime), self.nBits, self.nNonce)
 
 
 class CBlock(CBlockHeader):
     __slots__ = ("vtx",)
 
     def __init__(self, header=None):
         super(CBlock, self).__init__(header)
         self.vtx = []
 
     def deserialize(self, f):
         super(CBlock, self).deserialize(f)
         self.vtx = deser_vector(f, CTransaction)
 
     def serialize(self):
         r = b""
         r += super(CBlock, self).serialize()
         r += ser_vector(self.vtx)
         return r
 
     # Calculate the merkle root given a vector of transaction hashes
     def get_merkle_root(self, hashes):
         while len(hashes) > 1:
             newhashes = []
             for i in range(0, len(hashes), 2):
                 i2 = min(i + 1, len(hashes) - 1)
                 newhashes.append(hash256(hashes[i] + hashes[i2]))
             hashes = newhashes
         return uint256_from_str(hashes[0])
 
     def calc_merkle_root(self):
         hashes = []
         for tx in self.vtx:
             tx.calc_sha256()
             hashes.append(ser_uint256(tx.sha256))
         return self.get_merkle_root(hashes)
 
     def is_valid(self):
         self.calc_sha256()
         target = uint256_from_compact(self.nBits)
         if self.sha256 > target:
             return False
         for tx in self.vtx:
             if not tx.is_valid():
                 return False
         if self.calc_merkle_root() != self.hashMerkleRoot:
             return False
         return True
 
     def solve(self):
         self.rehash()
         target = uint256_from_compact(self.nBits)
         while self.sha256 > target:
             self.nNonce += 1
             self.rehash()
 
     def __repr__(self):
         return "CBlock(nVersion={} hashPrevBlock={:064x} hashMerkleRoot={:064x} nTime={} nBits={:08x} nNonce={:08x} vtx={})".format(
             self.nVersion, self.hashPrevBlock, self.hashMerkleRoot,
             time.ctime(self.nTime), self.nBits, self.nNonce, repr(self.vtx))
 
 
 class PrefilledTransaction:
     __slots__ = ("index", "tx")
 
     def __init__(self, index=0, tx=None):
         self.index = index
         self.tx = tx
 
     def deserialize(self, f):
         self.index = deser_compact_size(f)
         self.tx = CTransaction()
         self.tx.deserialize(f)
 
     def serialize(self):
         r = b""
         r += ser_compact_size(self.index)
         r += self.tx.serialize()
         return r
 
     def __repr__(self):
         return "PrefilledTransaction(index={}, tx={})".format(
             self.index, repr(self.tx))
 
 
 # This is what we send on the wire, in a cmpctblock message.
 class P2PHeaderAndShortIDs:
     __slots__ = ("header", "nonce", "prefilled_txn", "prefilled_txn_length",
                  "shortids", "shortids_length")
 
     def __init__(self):
         self.header = CBlockHeader()
         self.nonce = 0
         self.shortids_length = 0
         self.shortids = []
         self.prefilled_txn_length = 0
         self.prefilled_txn = []
 
     def deserialize(self, f):
         self.header.deserialize(f)
         self.nonce = struct.unpack("<Q", f.read(8))[0]
         self.shortids_length = deser_compact_size(f)
         for i in range(self.shortids_length):
             # shortids are defined to be 6 bytes in the spec, so append
             # two zero bytes and read it in as an 8-byte number
             self.shortids.append(
                 struct.unpack("<Q", f.read(6) + b'\x00\x00')[0])
         self.prefilled_txn = deser_vector(f, PrefilledTransaction)
         self.prefilled_txn_length = len(self.prefilled_txn)
 
     def serialize(self):
         r = b""
         r += self.header.serialize()
         r += struct.pack("<Q", self.nonce)
         r += ser_compact_size(self.shortids_length)
         for x in self.shortids:
             # We only want the first 6 bytes
             r += struct.pack("<Q", x)[0:6]
         r += ser_vector(self.prefilled_txn)
         return r
 
     def __repr__(self):
         return "P2PHeaderAndShortIDs(header={}, nonce={}, shortids_length={}, shortids={}, prefilled_txn_length={}, prefilledtxn={}".format(
             repr(self.header), self.nonce, self.shortids_length,
             repr(self.shortids), self.prefilled_txn_length,
             repr(self.prefilled_txn))
 
 # Calculate the BIP 152-compact blocks shortid for a given transaction hash
 
 
 def calculate_shortid(k0, k1, tx_hash):
     expected_shortid = siphash256(k0, k1, tx_hash)
     expected_shortid &= 0x0000ffffffffffff
     return expected_shortid
 
 
 # This version gets rid of the array lengths, and reinterprets the differential
 # encoding into indices that can be used for lookup.
 class HeaderAndShortIDs:
     __slots__ = ("header", "nonce", "prefilled_txn", "shortids")
 
     def __init__(self, p2pheaders_and_shortids=None):
         self.header = CBlockHeader()
         self.nonce = 0
         self.shortids = []
         self.prefilled_txn = []
 
         if p2pheaders_and_shortids != None:
             self.header = p2pheaders_and_shortids.header
             self.nonce = p2pheaders_and_shortids.nonce
             self.shortids = p2pheaders_and_shortids.shortids
             last_index = -1
             for x in p2pheaders_and_shortids.prefilled_txn:
                 self.prefilled_txn.append(
                     PrefilledTransaction(x.index + last_index + 1, x.tx))
                 last_index = self.prefilled_txn[-1].index
 
     def to_p2p(self):
         ret = P2PHeaderAndShortIDs()
         ret.header = self.header
         ret.nonce = self.nonce
         ret.shortids_length = len(self.shortids)
         ret.shortids = self.shortids
         ret.prefilled_txn_length = len(self.prefilled_txn)
         ret.prefilled_txn = []
         last_index = -1
         for x in self.prefilled_txn:
             ret.prefilled_txn.append(
                 PrefilledTransaction(x.index - last_index - 1, x.tx))
             last_index = x.index
         return ret
 
     def get_siphash_keys(self):
         header_nonce = self.header.serialize()
         header_nonce += struct.pack("<Q", self.nonce)
         hash_header_nonce_as_str = sha256(header_nonce)
         key0 = struct.unpack("<Q", hash_header_nonce_as_str[0:8])[0]
         key1 = struct.unpack("<Q", hash_header_nonce_as_str[8:16])[0]
         return [key0, key1]
 
     # Version 2 compact blocks use wtxid in shortids (rather than txid)
     def initialize_from_block(self, block, nonce=0, prefill_list=[0]):
         self.header = CBlockHeader(block)
         self.nonce = nonce
         self.prefilled_txn = [PrefilledTransaction(i, block.vtx[i])
                               for i in prefill_list]
         self.shortids = []
         [k0, k1] = self.get_siphash_keys()
         for i in range(len(block.vtx)):
             if i not in prefill_list:
                 tx_hash = block.vtx[i].sha256
                 self.shortids.append(calculate_shortid(k0, k1, tx_hash))
 
     def __repr__(self):
         return "HeaderAndShortIDs(header={}, nonce={}, shortids={}, prefilledtxn={}".format(
             repr(self.header), self.nonce, repr(self.shortids),
             repr(self.prefilled_txn))
 
 
 class BlockTransactionsRequest:
     __slots__ = ("blockhash", "indexes")
 
     def __init__(self, blockhash=0, indexes=None):
         self.blockhash = blockhash
         self.indexes = indexes if indexes != None else []
 
     def deserialize(self, f):
         self.blockhash = deser_uint256(f)
         indexes_length = deser_compact_size(f)
         for i in range(indexes_length):
             self.indexes.append(deser_compact_size(f))
 
     def serialize(self):
         r = b""
         r += ser_uint256(self.blockhash)
         r += ser_compact_size(len(self.indexes))
         for x in self.indexes:
             r += ser_compact_size(x)
         return r
 
     # helper to set the differentially encoded indexes from absolute ones
     def from_absolute(self, absolute_indexes):
         self.indexes = []
         last_index = -1
         for x in absolute_indexes:
             self.indexes.append(x - last_index - 1)
             last_index = x
 
     def to_absolute(self):
         absolute_indexes = []
         last_index = -1
         for x in self.indexes:
             absolute_indexes.append(x + last_index + 1)
             last_index = absolute_indexes[-1]
         return absolute_indexes
 
     def __repr__(self):
         return "BlockTransactionsRequest(hash={:064x} indexes={})".format(
             self.blockhash, repr(self.indexes))
 
 
 class BlockTransactions:
     __slots__ = ("blockhash", "transactions")
 
     def __init__(self, blockhash=0, transactions=None):
         self.blockhash = blockhash
         self.transactions = transactions if transactions != None else []
 
     def deserialize(self, f):
         self.blockhash = deser_uint256(f)
         self.transactions = deser_vector(f, CTransaction)
 
     def serialize(self):
         r = b""
         r += ser_uint256(self.blockhash)
         r += ser_vector(self.transactions)
         return r
 
     def __repr__(self):
         return "BlockTransactions(hash={:064x} transactions={})".format(
             self.blockhash, repr(self.transactions))
 
 
 class CPartialMerkleTree:
     __slots__ = ("fBad", "nTransactions", "vBits", "vHash")
 
     def __init__(self):
         self.nTransactions = 0
         self.vHash = []
         self.vBits = []
         self.fBad = False
 
     def deserialize(self, f):
         self.nTransactions = struct.unpack("<i", f.read(4))[0]
         self.vHash = deser_uint256_vector(f)
         vBytes = deser_string(f)
         self.vBits = []
         for i in range(len(vBytes) * 8):
             self.vBits.append(vBytes[i // 8] & (1 << (i % 8)) != 0)
 
     def serialize(self):
         r = b""
         r += struct.pack("<i", self.nTransactions)
         r += ser_uint256_vector(self.vHash)
         vBytesArray = bytearray([0x00] * ((len(self.vBits) + 7) // 8))
         for i in range(len(self.vBits)):
             vBytesArray[i // 8] |= self.vBits[i] << (i % 8)
         r += ser_string(bytes(vBytesArray))
         return r
 
     def __repr__(self):
         return "CPartialMerkleTree(nTransactions={}, vHash={}, vBits={})".format(self.nTransactions, repr(self.vHash), repr(self.vBits))
 
 
 class CMerkleBlock:
     __slots__ = ("header", "txn")
 
     def __init__(self):
         self.header = CBlockHeader()
         self.txn = CPartialMerkleTree()
 
     def deserialize(self, f):
         self.header.deserialize(f)
         self.txn.deserialize(f)
 
     def serialize(self):
         r = b""
         r += self.header.serialize()
         r += self.txn.serialize()
         return r
 
     def __repr__(self):
         return "CMerkleBlock(header={}, txn={})".format(repr(self.header), repr(self.txn))
 
 
 # Objects that correspond to messages on the wire
 
 
 class msg_version:
     __slots__ = ("addrFrom", "addrTo", "nNonce", "nRelay", "nServices",
                  "nStartingHeight", "nTime", "nVersion", "strSubVer")
     command = b"version"
 
     def __init__(self):
         self.nVersion = MY_VERSION
         self.nServices = 1
         self.nTime = int(time.time())
         self.addrTo = CAddress()
         self.addrFrom = CAddress()
         self.nNonce = random.getrandbits(64)
         self.strSubVer = MY_SUBVERSION
         self.nStartingHeight = -1
         self.nRelay = MY_RELAY
 
     def deserialize(self, f):
         self.nVersion = struct.unpack("<i", f.read(4))[0]
-        if self.nVersion == 10300:
-            self.nVersion = 300
         self.nServices = struct.unpack("<Q", f.read(8))[0]
         self.nTime = struct.unpack("<q", f.read(8))[0]
         self.addrTo = CAddress()
         self.addrTo.deserialize(f, False)
 
-        if self.nVersion >= 106:
-            self.addrFrom = CAddress()
-            self.addrFrom.deserialize(f, False)
-            self.nNonce = struct.unpack("<Q", f.read(8))[0]
-            self.strSubVer = deser_string(f)
-        else:
-            self.addrFrom = None
-            self.nNonce = None
-            self.strSubVer = None
-            self.nStartingHeight = None
+        self.addrFrom = CAddress()
+        self.addrFrom.deserialize(f, False)
+        self.nNonce = struct.unpack("<Q", f.read(8))[0]
+        self.strSubVer = deser_string(f)
 
-        if self.nVersion >= 209:
-            self.nStartingHeight = struct.unpack("<i", f.read(4))[0]
-        else:
-            self.nStartingHeight = None
+        self.nStartingHeight = struct.unpack("<i", f.read(4))[0]
 
         if self.nVersion >= 70001:
             # Relay field is optional for version 70001 onwards
             try:
                 self.nRelay = struct.unpack("<b", f.read(1))[0]
             except:
                 self.nRelay = 0
         else:
             self.nRelay = 0
 
     def serialize(self):
         r = b""
         r += struct.pack("<i", self.nVersion)
         r += struct.pack("<Q", self.nServices)
         r += struct.pack("<q", self.nTime)
         r += self.addrTo.serialize(False)
         r += self.addrFrom.serialize(False)
         r += struct.pack("<Q", self.nNonce)
         r += ser_string(self.strSubVer)
         r += struct.pack("<i", self.nStartingHeight)
         r += struct.pack("<b", self.nRelay)
         return r
 
     def __repr__(self):
         return 'msg_version(nVersion={} nServices={} nTime={} addrTo={} addrFrom={} nNonce=0x{:016X} strSubVer={} nStartingHeight={} nRelay={})'.format(
             self.nVersion, self.nServices, time.ctime(self.nTime),
             repr(self.addrTo), repr(self.addrFrom), self.nNonce,
             self.strSubVer, self.nStartingHeight, self.nRelay)
 
 
 class msg_verack:
     __slots__ = ()
     command = b"verack"
 
     def __init__(self):
         pass
 
     def deserialize(self, f):
         pass
 
     def serialize(self):
         return b""
 
     def __repr__(self):
         return "msg_verack()"
 
 
 class msg_addr:
     __slots__ = ("addrs",)
     command = b"addr"
 
     def __init__(self):
         self.addrs = []
 
     def deserialize(self, f):
         self.addrs = deser_vector(f, CAddress)
 
     def serialize(self):
         return ser_vector(self.addrs)
 
     def __repr__(self):
         return "msg_addr(addrs={})".format(repr(self.addrs))
 
 
 class msg_inv:
     __slots__ = ("inv",)
     command = b"inv"
 
     def __init__(self, inv=None):
         if inv is None:
             self.inv = []
         else:
             self.inv = inv
 
     def deserialize(self, f):
         self.inv = deser_vector(f, CInv)
 
     def serialize(self):
         return ser_vector(self.inv)
 
     def __repr__(self):
         return "msg_inv(inv={})".format(repr(self.inv))
 
 
 class msg_getdata:
     __slots__ = ("inv",)
     command = b"getdata"
 
     def __init__(self, inv=None):
         self.inv = inv if inv != None else []
 
     def deserialize(self, f):
         self.inv = deser_vector(f, CInv)
 
     def serialize(self):
         return ser_vector(self.inv)
 
     def __repr__(self):
         return "msg_getdata(inv={})".format(repr(self.inv))
 
 
 class msg_getblocks:
     __slots__ = ("locator", "hashstop")
     command = b"getblocks"
 
     def __init__(self):
         self.locator = CBlockLocator()
         self.hashstop = 0
 
     def deserialize(self, f):
         self.locator = CBlockLocator()
         self.locator.deserialize(f)
         self.hashstop = deser_uint256(f)
 
     def serialize(self):
         r = b""
         r += self.locator.serialize()
         r += ser_uint256(self.hashstop)
         return r
 
     def __repr__(self):
         return "msg_getblocks(locator={} hashstop={:064x})".format(
             repr(self.locator), self.hashstop)
 
 
 class msg_tx:
     __slots__ = ("tx",)
     command = b"tx"
 
     def __init__(self, tx=CTransaction()):
         self.tx = tx
 
     def deserialize(self, f):
         self.tx.deserialize(f)
 
     def serialize(self):
         return self.tx.serialize()
 
     def __repr__(self):
         return "msg_tx(tx={})".format(repr(self.tx))
 
 
 class msg_block:
     __slots__ = ("block",)
     command = b"block"
 
     def __init__(self, block=None):
         if block is None:
             self.block = CBlock()
         else:
             self.block = block
 
     def deserialize(self, f):
         self.block.deserialize(f)
 
     def serialize(self):
         return self.block.serialize()
 
     def __repr__(self):
         return "msg_block(block={})".format(repr(self.block))
 
 
 # for cases where a user needs tighter control over what is sent over the wire
 # note that the user must supply the name of the command, and the data
 
 
 class msg_generic:
     __slots__ = ("command", "data")
 
     def __init__(self, command, data=None):
         self.command = command
         self.data = data
 
     def serialize(self):
         return self.data
 
     def __repr__(self):
         return "msg_generic()"
 
 
 class msg_getaddr:
     __slots__ = ()
     command = b"getaddr"
 
     def __init__(self):
         pass
 
     def deserialize(self, f):
         pass
 
     def serialize(self):
         return b""
 
     def __repr__(self):
         return "msg_getaddr()"
 
 
 class msg_ping:
     __slots__ = ("nonce",)
     command = b"ping"
 
     def __init__(self, nonce=0):
         self.nonce = nonce
 
     def deserialize(self, f):
         self.nonce = struct.unpack("<Q", f.read(8))[0]
 
     def serialize(self):
         r = b""
         r += struct.pack("<Q", self.nonce)
         return r
 
     def __repr__(self):
         return "msg_ping(nonce={:08x})".format(self.nonce)
 
 
 class msg_pong:
     __slots__ = ("nonce",)
     command = b"pong"
 
     def __init__(self, nonce=0):
         self.nonce = nonce
 
     def deserialize(self, f):
         self.nonce = struct.unpack("<Q", f.read(8))[0]
 
     def serialize(self):
         r = b""
         r += struct.pack("<Q", self.nonce)
         return r
 
     def __repr__(self):
         return "msg_pong(nonce={:08x})".format(self.nonce)
 
 
 class msg_mempool:
     __slots__ = ()
     command = b"mempool"
 
     def __init__(self):
         pass
 
     def deserialize(self, f):
         pass
 
     def serialize(self):
         return b""
 
     def __repr__(self):
         return "msg_mempool()"
 
 
 class msg_notfound:
     __slots__ = ("vec", )
     command = b"notfound"
 
     def __init__(self, vec=None):
         self.vec = vec or []
 
     def deserialize(self, f):
         self.vec = deser_vector(f, CInv)
 
     def serialize(self):
         return ser_vector(self.vec)
 
     def __repr__(self):
         return "msg_notfound(vec={})".format(repr(self.vec))
 
 
 class msg_sendheaders:
     __slots__ = ()
     command = b"sendheaders"
 
     def __init__(self):
         pass
 
     def deserialize(self, f):
         pass
 
     def serialize(self):
         return b""
 
     def __repr__(self):
         return "msg_sendheaders()"
 
 
 # getheaders message has
 # number of entries
 # vector of hashes
 # hash_stop (hash of last desired block header, 0 to get as many as possible)
 class msg_getheaders:
     __slots__ = ("hashstop", "locator",)
     command = b"getheaders"
 
     def __init__(self):
         self.locator = CBlockLocator()
         self.hashstop = 0
 
     def deserialize(self, f):
         self.locator = CBlockLocator()
         self.locator.deserialize(f)
         self.hashstop = deser_uint256(f)
 
     def serialize(self):
         r = b""
         r += self.locator.serialize()
         r += ser_uint256(self.hashstop)
         return r
 
     def __repr__(self):
         return "msg_getheaders(locator={}, stop={:064x})".format(
             repr(self.locator), self.hashstop)
 
 
 # headers message has
 # <count> <vector of block headers>
 class msg_headers:
     __slots__ = ("headers",)
     command = b"headers"
 
     def __init__(self, headers=None):
         self.headers = headers if headers is not None else []
 
     def deserialize(self, f):
         # comment in bitcoind indicates these should be deserialized as blocks
         blocks = deser_vector(f, CBlock)
         for x in blocks:
             self.headers.append(CBlockHeader(x))
 
     def serialize(self):
         blocks = [CBlock(x) for x in self.headers]
         return ser_vector(blocks)
 
     def __repr__(self):
         return "msg_headers(headers={})".format(repr(self.headers))
 
 
 class msg_reject:
     __slots__ = ("code", "data", "message", "reason")
     command = b"reject"
     REJECT_MALFORMED = 1
 
     def __init__(self):
         self.message = b""
         self.code = 0
         self.reason = b""
         self.data = 0
 
     def deserialize(self, f):
         self.message = deser_string(f)
         self.code = struct.unpack("<B", f.read(1))[0]
         self.reason = deser_string(f)
         if (self.code != self.REJECT_MALFORMED and
                 (self.message == b"block" or self.message == b"tx")):
             self.data = deser_uint256(f)
 
     def serialize(self):
         r = ser_string(self.message)
         r += struct.pack("<B", self.code)
         r += ser_string(self.reason)
         if (self.code != self.REJECT_MALFORMED and
                 (self.message == b"block" or self.message == b"tx")):
             r += ser_uint256(self.data)
         return r
 
     def __repr__(self):
         return "msg_reject: {} {} {} [{:064x}]".format(
             self.message, self.code, self.reason, self.data)
 
 
 class msg_feefilter:
     __slots__ = ("feerate",)
     command = b"feefilter"
 
     def __init__(self, feerate=0):
         self.feerate = feerate
 
     def deserialize(self, f):
         self.feerate = struct.unpack("<Q", f.read(8))[0]
 
     def serialize(self):
         r = b""
         r += struct.pack("<Q", self.feerate)
         return r
 
     def __repr__(self):
         return "msg_feefilter(feerate={:08x})".format(self.feerate)
 
 
 class msg_sendcmpct:
     __slots__ = ("announce", "version")
     command = b"sendcmpct"
 
     def __init__(self):
         self.announce = False
         self.version = 1
 
     def deserialize(self, f):
         self.announce = struct.unpack("<?", f.read(1))[0]
         self.version = struct.unpack("<Q", f.read(8))[0]
 
     def serialize(self):
         r = b""
         r += struct.pack("<?", self.announce)
         r += struct.pack("<Q", self.version)
         return r
 
     def __repr__(self):
         return "msg_sendcmpct(announce={}, version={})".format(
             self.announce, self.version)
 
 
 class msg_cmpctblock:
     __slots__ = ("header_and_shortids",)
     command = b"cmpctblock"
 
     def __init__(self, header_and_shortids=None):
         self.header_and_shortids = header_and_shortids
 
     def deserialize(self, f):
         self.header_and_shortids = P2PHeaderAndShortIDs()
         self.header_and_shortids.deserialize(f)
 
     def serialize(self):
         r = b""
         r += self.header_and_shortids.serialize()
         return r
 
     def __repr__(self):
         return "msg_cmpctblock(HeaderAndShortIDs={})".format(
             repr(self.header_and_shortids))
 
 
 class msg_getblocktxn:
     __slots__ = ("block_txn_request",)
     command = b"getblocktxn"
 
     def __init__(self):
         self.block_txn_request = None
 
     def deserialize(self, f):
         self.block_txn_request = BlockTransactionsRequest()
         self.block_txn_request.deserialize(f)
 
     def serialize(self):
         r = b""
         r += self.block_txn_request.serialize()
         return r
 
     def __repr__(self):
         return "msg_getblocktxn(block_txn_request={})".format(
             repr(self.block_txn_request))
 
 
 class msg_blocktxn:
     __slots__ = ("block_transactions",)
     command = b"blocktxn"
 
     def __init__(self):
         self.block_transactions = BlockTransactions()
 
     def deserialize(self, f):
         self.block_transactions.deserialize(f)
 
     def serialize(self):
         r = b""
         r += self.block_transactions.serialize()
         return r
 
     def __repr__(self):
         return "msg_blocktxn(block_transactions={})".format(
             repr(self.block_transactions))