diff --git a/test/functional/test_framework/messages.py b/test/functional/test_framework/messages.py
index 682a7b351..2e8e76c7d 100755
--- a/test/functional/test_framework/messages.py
+++ b/test/functional/test_framework/messages.py
@@ -1,2254 +1,2252 @@
 #!/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.
 """
 import copy
 import hashlib
 import random
 import socket
 import struct
 import time
 import unittest
 from base64 import b64decode, b64encode
-from codecs import encode
 from enum import IntEnum
 from io import BytesIO
 from typing import List
 
 from test_framework.siphash import siphash256
 from test_framework.util import assert_equal, uint256_hex
 
 MAX_LOCATOR_SZ = 101
 MAX_BLOCK_BASE_SIZE = 1000000
 MAX_BLOOM_FILTER_SIZE = 36000
 MAX_BLOOM_HASH_FUNCS = 50
 
 # 1,000,000 XEC in satoshis (legacy BCHA)
 COIN = 100000000
 # 1 XEC in satoshis
 XEC = 100
 MAX_MONEY = 21000000 * COIN
 
 # Maximum length of incoming protocol messages
 MAX_PROTOCOL_MESSAGE_LENGTH = 2 * 1024 * 1024
 MAX_HEADERS_RESULTS = 2000  # Number of headers sent in one getheaders result
 MAX_INV_SIZE = 50000  # Maximum number of entries in an 'inv' protocol message
 
 NODE_NETWORK = (1 << 0)
 NODE_GETUTXO = (1 << 1)
 NODE_BLOOM = (1 << 2)
 # NODE_WITNESS = (1 << 3)
 # NODE_XTHIN = (1 << 4) # removed in v0.22.12
 NODE_COMPACT_FILTERS = (1 << 6)
 NODE_NETWORK_LIMITED = (1 << 10)
 NODE_AVALANCHE = (1 << 24)
 
 MSG_TX = 1
 MSG_BLOCK = 2
 MSG_FILTERED_BLOCK = 3
 MSG_CMPCT_BLOCK = 4
 MSG_AVA_PROOF = 0x1f000001
 MSG_TYPE_MASK = 0xffffffff >> 2
 
 FILTER_TYPE_BASIC = 0
 
 # Serialization/deserialization tools
 
 
 def sha256(s):
     return hashlib.new('sha256', s).digest()
 
 
 def hash256(s):
     return sha256(sha256(s))
 
 
 def ser_compact_size(size):
     r = b""
     if size < 253:
         r = struct.pack("B", size)
     elif size < 0x10000:
         r = struct.pack("<BH", 253, size)
     elif size < 0x100000000:
         r = struct.pack("<BI", 254, size)
     else:
         r = struct.pack("<BQ", 255, size)
     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 _ 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
 
 
 # deser_function_name: Allow for an alternate deserialization function on the
 # entries in the vector.
 def deser_vector(f, c, deser_function_name=None):
     nit = deser_compact_size(f)
     r = []
     for _ in range(nit):
         t = c()
         if deser_function_name:
             getattr(t, deser_function_name)(f)
         else:
             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(v, ser_function_name=None):
     r = ser_compact_size(len(v))
     for i in v:
         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 _ in range(nit):
         t = deser_uint256(f)
         r.append(t)
     return r
 
 
 def ser_uint256_vector(v):
     r = ser_compact_size(len(v))
     for i in v:
         r += ser_uint256(i)
     return r
 
 
 def deser_string_vector(f):
     nit = deser_compact_size(f)
     r = []
     for _ in range(nit):
         t = deser_string(f)
         r.append(t)
     return r
 
 
 def ser_string_vector(v):
     r = ser_compact_size(len(v))
     for sv in v:
         r += ser_string(sv)
     return r
 
 
 def FromHex(obj, hex_string):
     """Deserialize from a hex string representation (eg from RPC)"""
     obj.deserialize(BytesIO(bytes.fromhex(hex_string)))
     return obj
 
 
 def ToHex(obj):
     """Convert a binary-serializable object to hex
     (eg for submission via RPC)"""
     return obj.serialize().hex()
 
 
 # Objects that map to bitcoind objects, which can be serialized/deserialized
 
 class CAddress:
     __slots__ = ("net", "ip", "nServices", "port", "time")
 
     # see https://github.com/bitcoin/bips/blob/master/bip-0155.mediawiki
     NET_IPV4 = 1
 
     ADDRV2_NET_NAME = {
         NET_IPV4: "IPv4"
     }
 
     ADDRV2_ADDRESS_LENGTH = {
         NET_IPV4: 4
     }
 
     def __init__(self):
         self.time = 0
         self.nServices = 1
         self.net = self.NET_IPV4
         self.ip = "0.0.0.0"
         self.port = 0
 
     def deserialize(self, f, *, with_time=True):
         """Deserialize from addrv1 format (pre-BIP155)"""
         if with_time:
             # VERSION messages serialize CAddress objects without time
             self.time = struct.unpack("<I", f.read(4))[0]
         self.nServices = struct.unpack("<Q", f.read(8))[0]
         # We only support IPv4 which means skip 12 bytes and read the next 4 as
         # IPv4 address.
         f.read(12)
         self.net = self.NET_IPV4
         self.ip = socket.inet_ntoa(f.read(4))
         self.port = struct.unpack(">H", f.read(2))[0]
 
     def serialize(self, *, with_time=True):
         """Serialize in addrv1 format (pre-BIP155)"""
         assert self.net == self.NET_IPV4
         r = b""
         if with_time:
             # VERSION messages serialize CAddress objects without time
             r += struct.pack("<I", self.time)
         r += struct.pack("<Q", self.nServices)
         r += b"\x00" * 10 + b"\xff" * 2
         r += socket.inet_aton(self.ip)
         r += struct.pack(">H", self.port)
         return r
 
     def deserialize_v2(self, f):
         """Deserialize from addrv2 format (BIP155)"""
         self.time = struct.unpack("<I", f.read(4))[0]
 
         self.nServices = deser_compact_size(f)
 
         self.net = struct.unpack("B", f.read(1))[0]
         assert self.net == self.NET_IPV4
 
         address_length = deser_compact_size(f)
         assert address_length == self.ADDRV2_ADDRESS_LENGTH[self.net]
 
         self.ip = socket.inet_ntoa(f.read(4))
 
         self.port = struct.unpack(">H", f.read(2))[0]
 
     def serialize_v2(self):
         """Serialize in addrv2 format (BIP155)"""
         assert self.net == self.NET_IPV4
         r = b""
         r += struct.pack("<I", self.time)
         r += ser_compact_size(self.nServices)
         r += struct.pack("B", self.net)
         r += ser_compact_size(self.ADDRV2_ADDRESS_LENGTH[self.net])
         r += socket.inet_aton(self.ip)
         r += struct.pack(">H", self.port)
         return r
 
     def __repr__(self):
         return ("CAddress(nServices=%i net=%s addr=%s port=%i)"
                 % (self.nServices, self.ADDRV2_NET_NAME[self.net], self.ip, self.port))
 
 
 class CInv:
     __slots__ = ("hash", "type")
 
     typemap = {
         0: "Error",
         MSG_TX: "TX",
         MSG_BLOCK: "Block",
         MSG_FILTERED_BLOCK: "filtered Block",
         MSG_CMPCT_BLOCK: "CompactBlock",
         MSG_AVA_PROOF: "avalanche proof",
     }
 
     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)
 
     def __eq__(self, other):
         return isinstance(
             other, CInv) and self.hash == other.hash and self.type == other.type
 
 
 class CBlockLocator:
     __slots__ = ("nVersion", "vHave")
 
     def __init__(self):
         self.vHave = []
 
     def deserialize(self, f):
         # Ignore version field.
         struct.unpack("<i", f.read(4))[0]
         self.vHave = deser_uint256_vector(f)
 
     def serialize(self):
         r = b""
         # Bitcoin ABC ignores version field. Set it to 0.
         r += struct.pack("<i", 0)
         r += ser_uint256_vector(self.vHave)
         return r
 
     def __repr__(self):
         return "CBlockLocator(vHave={})".format(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={}.{:02d} scriptPubKey={})".format(
             self.nValue // XEC, self.nValue % XEC, 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')
+        self.hash = hash256(self.serialize())[::-1].hex()
 
     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 > MAX_MONEY:
                 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')
+            self.hash = hash256(r)[::-1].hex()
 
     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,
             self.nTime, self.nBits, self.nNonce)
 
 
 BLOCK_HEADER_SIZE = len(CBlockHeader().serialize())
 assert_equal(BLOCK_HEADER_SIZE, 80)
 
 
 class CBlock(CBlockHeader):
     __slots__ = ("vtx",)
 
     def __init__(self, header=None):
         super().__init__(header)
         self.vtx: List[CTransaction] = []
 
     def deserialize(self, f):
         super().deserialize(f)
         self.vtx = deser_vector(f, CTransaction)
 
     def serialize(self):
         r = b""
         r += super().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,
             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 _ 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))
 
 
 def calculate_shortid(k0, k1, tx_hash):
     """Calculate the BIP 152-compact blocks shortid for a given
     transaction 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 is not 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=None):
         if prefill_list is None:
             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 is not None else []
 
     def deserialize(self, f):
         self.blockhash = deser_uint256(f)
         indexes_length = deser_compact_size(f)
         for _ 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 is not 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 AvalancheStake:
     def __init__(self, utxo=None, amount=0, height=0,
                  pubkey=b"", is_coinbase=False):
         self.utxo: COutPoint = utxo or COutPoint()
         self.amount: int = amount
         """Amount in satoshis (int64)"""
         self.height: int = height
         """Block height containing this utxo (uint32)"""
         self.pubkey: bytes = pubkey
         """Public key"""
 
         self.is_coinbase: bool = is_coinbase
 
     def deserialize(self, f):
         self.utxo = COutPoint()
         self.utxo.deserialize(f)
         self.amount = struct.unpack("<q", f.read(8))[0]
         height_ser = struct.unpack("<I", f.read(4))[0]
         self.is_coinbase = bool(height_ser & 1)
         self.height = height_ser >> 1
         self.pubkey = deser_string(f)
 
     def serialize(self) -> bytes:
         r = self.utxo.serialize()
         height_ser = self.height << 1 | int(self.is_coinbase)
         r += struct.pack('<q', self.amount)
         r += struct.pack('<I', height_ser)
         r += ser_compact_size(len(self.pubkey))
         r += self.pubkey
         return r
 
     def __repr__(self):
         return f"AvalancheStake(utxo={self.utxo}, amount={self.amount}," \
                f" height={self.height}, " \
                f"pubkey={self.pubkey.hex()})"
 
 
 class AvalancheSignedStake:
     def __init__(self, stake=None, sig=b""):
         self.stake: AvalancheStake = stake or AvalancheStake()
         self.sig: bytes = sig
         """Signature for this stake, bytes of length 64"""
 
     def deserialize(self, f):
         self.stake = AvalancheStake()
         self.stake.deserialize(f)
         self.sig = f.read(64)
 
     def serialize(self) -> bytes:
         return self.stake.serialize() + self.sig
 
 
 class AvalancheProof:
     __slots__ = (
         "sequence",
         "expiration",
         "master",
         "stakes",
         "payout_script",
         "signature",
         "limited_proofid",
         "proofid")
 
     def __init__(self, sequence=0, expiration=0,
                  master=b"", signed_stakes=None, payout_script=b"", signature=b""):
         self.sequence: int = sequence
         self.expiration: int = expiration
         self.master: bytes = master
 
         self.stakes: List[AvalancheSignedStake] = signed_stakes or [
             AvalancheSignedStake()]
 
         self.payout_script = payout_script
         self.signature = signature
 
         self.limited_proofid: int = None
         self.proofid: int = None
         self.compute_proof_id()
 
     def compute_proof_id(self):
         """Compute Bitcoin's 256-bit hash (double SHA-256) of the
         serialized proof data.
         """
         ss = struct.pack("<Qq", self.sequence, self.expiration)
         ss += ser_string(self.payout_script)
         ss += ser_compact_size(len(self.stakes))
         # Use unsigned stakes
         for s in self.stakes:
             ss += s.stake.serialize()
         h = hash256(ss)
         self.limited_proofid = uint256_from_str(h)
         h += ser_string(self.master)
         h = hash256(h)
         # make it an int, for comparing with Delegation.proofid
         self.proofid = uint256_from_str(h)
 
     def deserialize(self, f):
         self.sequence = struct.unpack("<Q", f.read(8))[0]
         self.expiration = struct.unpack("<q", f.read(8))[0]
         self.master = deser_string(f)
         self.stakes = deser_vector(f, AvalancheSignedStake)
         self.payout_script = deser_string(f)
         self.signature = f.read(64)
         self.compute_proof_id()
 
     def serialize(self):
         r = b""
         r += struct.pack("<Q", self.sequence)
         r += struct.pack("<q", self.expiration)
         r += ser_string(self.master)
         r += ser_vector(self.stakes)
         r += ser_string(self.payout_script)
         r += self.signature
         return r
 
     def __repr__(self):
         return f"AvalancheProof(sequence={self.sequence}, " \
                f"expiration={self.expiration}, " \
                f"master={self.master.hex()}, " \
                f"payout_script={self.payout_script.hex()}, " \
                f"signature={b64encode(self.signature)}, " \
                f"stakes={self.stakes})"
 
 
 class AvalanchePrefilledProof:
     __slots__ = ("index", "proof")
 
     def __init__(self, index=0, proof=None):
         self.index = index
         self.proof = proof or AvalancheProof()
 
     def deserialize(self, f):
         self.index = deser_compact_size(f)
         self.proof.deserialize(f)
 
     def serialize(self):
         r = b""
         r += ser_compact_size(self.index)
         r += self.proof.serialize()
         return r
 
     def __repr__(self):
         return "AvalanchePrefilledProof(index={}, proof={})".format(
             self.index, repr(self.proof))
 
 
 class AvalanchePoll:
     __slots__ = ("round", "invs")
 
     def __init__(self, round=0, invs=None):
         self.round = round
         self.invs = invs if invs is not None else []
 
     def deserialize(self, f):
         self.round = struct.unpack("<q", f.read(8))[0]
         self.invs = deser_vector(f, CInv)
 
     def serialize(self):
         r = b""
         r += struct.pack("<q", self.round)
         r += ser_vector(self.invs)
         return r
 
     def __repr__(self):
         return "AvalanchePoll(round={}, invs={})".format(
             self.round, repr(self.invs))
 
 
 class AvalancheVoteError(IntEnum):
     ACCEPTED = 0
     INVALID = 1
     PARKED = 2
     FORK = 3
     UNKNOWN = -1
     MISSING = -2
     PENDING = -3
 
 
 class AvalancheProofVoteResponse(IntEnum):
     ACTIVE = 0
     REJECTED = 1
     IMMATURE = 2
     CONFLICT = 3
     UNKNOWN = -1
 
 
 class AvalancheVote:
     __slots__ = ("error", "hash")
 
     def __init__(self, e=0, h=0):
         self.error = e
         self.hash = h
 
     def deserialize(self, f):
         self.error = struct.unpack("<i", f.read(4))[0]
         self.hash = deser_uint256(f)
 
     def serialize(self):
         r = b""
         r += struct.pack("<i", self.error)
         r += ser_uint256(self.hash)
         return r
 
     def __repr__(self):
         return "AvalancheVote(error={}, hash={:064x})".format(
             self.error, self.hash)
 
 
 class AvalancheResponse:
     __slots__ = ("round", "cooldown", "votes")
 
     def __init__(self, round=0, cooldown=0, votes=None):
         self.round = round
         self.cooldown = cooldown
         self.votes = votes if votes is not None else []
 
     def deserialize(self, f):
         self.round = struct.unpack("<q", f.read(8))[0]
         self.cooldown = struct.unpack("<i", f.read(4))[0]
         self.votes = deser_vector(f, AvalancheVote)
 
     def serialize(self):
         r = b""
         r += struct.pack("<q", self.round)
         r += struct.pack("<i", self.cooldown)
         r += ser_vector(self.votes)
         return r
 
     def get_hash(self):
         return hash256(self.serialize())
 
     def __repr__(self):
         return "AvalancheResponse(round={}, cooldown={}, votes={})".format(
             self.round, self.cooldown, repr(self.votes))
 
 
 class TCPAvalancheResponse:
     __slots__ = ("response", "sig")
 
     def __init__(self, response=AvalancheResponse(), sig=b"\0" * 64):
         self.response = response
         self.sig = sig
 
     def deserialize(self, f):
         self.response.deserialize(f)
         self.sig = f.read(64)
 
     def serialize(self):
         r = b""
         r += self.response.serialize()
         r += self.sig
         return r
 
     def __repr__(self):
         return "TCPAvalancheResponse(response={}, sig={})".format(
             repr(self.response), self.sig)
 
 
 class AvalancheDelegationLevel:
     __slots__ = ("pubkey", "sig")
 
     def __init__(self, pubkey=b"", sig=b"\0" * 64):
         self.pubkey = pubkey
         self.sig = sig
 
     def deserialize(self, f):
         self.pubkey = deser_string(f)
         self.sig = f.read(64)
 
     def serialize(self):
         r = b""
         r += ser_string(self.pubkey)
         r += self.sig
         return r
 
     def __repr__(self):
         return "AvalancheDelegationLevel(pubkey={}, sig={})".format(
             self.pubkey.hex(), self.sig)
 
 
 class AvalancheDelegation:
     __slots__ = ("limited_proofid", "proof_master", "proofid", "levels")
 
     def __init__(self, limited_proofid=0,
                  proof_master=b"", levels=None):
         self.limited_proofid: int = limited_proofid
         self.proof_master: bytes = proof_master
         self.levels: List[AvalancheDelegationLevel] = levels or []
         self.proofid: int = self.compute_proofid()
 
     def compute_proofid(self) -> int:
         return uint256_from_str(hash256(
             ser_uint256(self.limited_proofid) + ser_string(self.proof_master)))
 
     def deserialize(self, f):
         self.limited_proofid = deser_uint256(f)
         self.proof_master = deser_string(f)
         self.levels = deser_vector(f, AvalancheDelegationLevel)
 
         self.proofid = self.compute_proofid()
 
     def serialize(self):
         r = b""
         r += ser_uint256(self.limited_proofid)
         r += ser_string(self.proof_master)
         r += ser_vector(self.levels)
         return r
 
     def __repr__(self):
         return f"AvalancheDelegation(limitedProofId={self.limited_proofid:064x}, " \
                f"proofMaster={self.proof_master.hex()}, proofid={self.proofid:064x}, " \
                f"levels={self.levels})"
 
     def getid(self):
         h = ser_uint256(self.proofid)
         for level in self.levels:
             h = hash256(h + ser_string(level.pubkey))
         return h
 
 
 class AvalancheHello:
     __slots__ = ("delegation", "sig")
 
     def __init__(self, delegation=AvalancheDelegation(), sig=b"\0" * 64):
         self.delegation = delegation
         self.sig = sig
 
     def deserialize(self, f):
         self.delegation.deserialize(f)
         self.sig = f.read(64)
 
     def serialize(self):
         r = b""
         r += self.delegation.serialize()
         r += self.sig
         return r
 
     def __repr__(self):
         return "AvalancheHello(delegation={}, sig={})".format(
             repr(self.delegation), self.sig)
 
     def get_sighash(self, node):
         b = self.delegation.getid()
         b += struct.pack("<Q", node.remote_nonce)
         b += struct.pack("<Q", node.local_nonce)
         b += struct.pack("<Q", node.remote_extra_entropy)
         b += struct.pack("<Q", node.local_extra_entropy)
         return hash256(b)
 
 
 class CPartialMerkleTree:
     __slots__ = ("nTransactions", "vBits", "vHash")
 
     def __init__(self):
         self.nTransactions = 0
         self.vHash = []
         self.vBits = []
 
     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", "relay", "nServices",
                  "nStartingHeight", "nTime", "nVersion", "strSubVer", "nExtraEntropy")
     msgtype = b"version"
 
     def __init__(self):
         self.nVersion = 0
         self.nServices = 0
         self.nTime = int(time.time())
         self.addrTo = CAddress()
         self.addrFrom = CAddress()
         self.nNonce = random.getrandbits(64)
         self.strSubVer = ''
         self.nStartingHeight = -1
         self.relay = 0
         self.nExtraEntropy = random.getrandbits(64)
 
     def deserialize(self, f):
         self.nVersion = struct.unpack("<i", f.read(4))[0]
         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, with_time=False)
 
         self.addrFrom = CAddress()
         self.addrFrom.deserialize(f, with_time=False)
         self.nNonce = struct.unpack("<Q", f.read(8))[0]
         self.strSubVer = deser_string(f).decode('utf-8')
 
         self.nStartingHeight = struct.unpack("<i", f.read(4))[0]
 
         self.relay = struct.unpack("<b", f.read(1))[0]
 
         self.nExtraEntropy = struct.unpack("<Q", f.read(8))[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(with_time=False)
         r += self.addrFrom.serialize(with_time=False)
         r += struct.pack("<Q", self.nNonce)
         r += ser_string(self.strSubVer.encode('utf-8'))
         r += struct.pack("<i", self.nStartingHeight)
         r += struct.pack("<b", self.relay)
         r += struct.pack("<Q", self.nExtraEntropy)
         return r
 
     def __repr__(self):
         return 'msg_version(nVersion={} nServices={} nTime={} addrTo={} addrFrom={} nNonce=0x{:016X} strSubVer={} nStartingHeight={} relay={} nExtraEntropy={})'.format(
             self.nVersion, self.nServices, self.nTime,
             repr(self.addrTo), repr(self.addrFrom), self.nNonce,
             self.strSubVer, self.nStartingHeight, self.relay, self.nExtraEntropy)
 
 
 class msg_verack:
     __slots__ = ()
     msgtype = 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",)
     msgtype = 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_addrv2:
     __slots__ = ("addrs",)
     msgtype = b"addrv2"
 
     def __init__(self):
         self.addrs = []
 
     def deserialize(self, f):
         self.addrs = deser_vector(f, CAddress, "deserialize_v2")
 
     def serialize(self):
         return ser_vector(self.addrs, "serialize_v2")
 
     def __repr__(self):
         return "msg_addrv2(addrs={})".format(repr(self.addrs))
 
 
 class msg_sendaddrv2:
     __slots__ = ()
     msgtype = b"sendaddrv2"
 
     def __init__(self):
         pass
 
     def deserialize(self, f):
         pass
 
     def serialize(self):
         return b""
 
     def __repr__(self):
         return "msg_sendaddrv2()"
 
 
 class msg_inv:
     __slots__ = ("inv",)
     msgtype = 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",)
     msgtype = b"getdata"
 
     def __init__(self, inv=None):
         self.inv = inv if inv is not 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")
     msgtype = 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",)
     msgtype = 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",)
     msgtype = 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 msgtype, and the data
 class msg_generic:
     __slots__ = ("msgtype", "data")
 
     def __init__(self, msgtype, data=None):
         self.msgtype = msgtype
         self.data = data
 
     def serialize(self):
         return self.data
 
     def __repr__(self):
         return "msg_generic()"
 
 
 class msg_getaddr:
     __slots__ = ()
     msgtype = 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",)
     msgtype = 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",)
     msgtype = 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__ = ()
     msgtype = 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", )
     msgtype = 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__ = ()
     msgtype = 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",)
     msgtype = 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",)
     msgtype = 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_merkleblock:
     __slots__ = ("merkleblock",)
     msgtype = b"merkleblock"
 
     def __init__(self, merkleblock=None):
         if merkleblock is None:
             self.merkleblock = CMerkleBlock()
         else:
             self.merkleblock = merkleblock
 
     def deserialize(self, f):
         self.merkleblock.deserialize(f)
 
     def serialize(self):
         return self.merkleblock.serialize()
 
     def __repr__(self):
         return "msg_merkleblock(merkleblock={})".format(repr(self.merkleblock))
 
 
 class msg_filterload:
     __slots__ = ("data", "nHashFuncs", "nTweak", "nFlags")
     msgtype = b"filterload"
 
     def __init__(self, data=b'00', nHashFuncs=0, nTweak=0, nFlags=0):
         self.data = data
         self.nHashFuncs = nHashFuncs
         self.nTweak = nTweak
         self.nFlags = nFlags
 
     def deserialize(self, f):
         self.data = deser_string(f)
         self.nHashFuncs = struct.unpack("<I", f.read(4))[0]
         self.nTweak = struct.unpack("<I", f.read(4))[0]
         self.nFlags = struct.unpack("<B", f.read(1))[0]
 
     def serialize(self):
         r = b""
         r += ser_string(self.data)
         r += struct.pack("<I", self.nHashFuncs)
         r += struct.pack("<I", self.nTweak)
         r += struct.pack("<B", self.nFlags)
         return r
 
     def __repr__(self):
         return "msg_filterload(data={}, nHashFuncs={}, nTweak={}, nFlags={})".format(
             self.data, self.nHashFuncs, self.nTweak, self.nFlags)
 
 
 class msg_filteradd:
     __slots__ = ("data")
     msgtype = b"filteradd"
 
     def __init__(self, data):
         self.data = data
 
     def deserialize(self, f):
         self.data = deser_string(f)
 
     def serialize(self):
         r = b""
         r += ser_string(self.data)
         return r
 
     def __repr__(self):
         return "msg_filteradd(data={})".format(self.data)
 
 
 class msg_filterclear:
     __slots__ = ()
     msgtype = b"filterclear"
 
     def __init__(self):
         pass
 
     def deserialize(self, f):
         pass
 
     def serialize(self):
         return b""
 
     def __repr__(self):
         return "msg_filterclear()"
 
 
 class msg_feefilter:
     __slots__ = ("feerate",)
     msgtype = 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")
     msgtype = b"sendcmpct"
 
     def __init__(self, announce=False, version=1):
         self.announce = announce
         self.version = version
 
     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",)
     msgtype = 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",)
     msgtype = 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",)
     msgtype = 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))
 
 
 class msg_getcfilters:
     __slots__ = ("filter_type", "start_height", "stop_hash")
     msgtype = b"getcfilters"
 
     def __init__(self, filter_type, start_height, stop_hash):
         self.filter_type = filter_type
         self.start_height = start_height
         self.stop_hash = stop_hash
 
     def deserialize(self, f):
         self.filter_type = struct.unpack("<B", f.read(1))[0]
         self.start_height = struct.unpack("<I", f.read(4))[0]
         self.stop_hash = deser_uint256(f)
 
     def serialize(self):
         r = b""
         r += struct.pack("<B", self.filter_type)
         r += struct.pack("<I", self.start_height)
         r += ser_uint256(self.stop_hash)
         return r
 
     def __repr__(self):
         return "msg_getcfilters(filter_type={:#x}, start_height={}, stop_hash={:x})".format(
             self.filter_type, self.start_height, self.stop_hash)
 
 
 class msg_cfilter:
     __slots__ = ("filter_type", "block_hash", "filter_data")
     msgtype = b"cfilter"
 
     def __init__(self, filter_type=None, block_hash=None, filter_data=None):
         self.filter_type = filter_type
         self.block_hash = block_hash
         self.filter_data = filter_data
 
     def deserialize(self, f):
         self.filter_type = struct.unpack("<B", f.read(1))[0]
         self.block_hash = deser_uint256(f)
         self.filter_data = deser_string(f)
 
     def serialize(self):
         r = b""
         r += struct.pack("<B", self.filter_type)
         r += ser_uint256(self.block_hash)
         r += ser_string(self.filter_data)
         return r
 
     def __repr__(self):
         return "msg_cfilter(filter_type={:#x}, block_hash={:x})".format(
             self.filter_type, self.block_hash)
 
 
 class msg_getcfheaders:
     __slots__ = ("filter_type", "start_height", "stop_hash")
     msgtype = b"getcfheaders"
 
     def __init__(self, filter_type, start_height, stop_hash):
         self.filter_type = filter_type
         self.start_height = start_height
         self.stop_hash = stop_hash
 
     def deserialize(self, f):
         self.filter_type = struct.unpack("<B", f.read(1))[0]
         self.start_height = struct.unpack("<I", f.read(4))[0]
         self.stop_hash = deser_uint256(f)
 
     def serialize(self):
         r = b""
         r += struct.pack("<B", self.filter_type)
         r += struct.pack("<I", self.start_height)
         r += ser_uint256(self.stop_hash)
         return r
 
     def __repr__(self):
         return "msg_getcfheaders(filter_type={:#x}, start_height={}, stop_hash={:x})".format(
             self.filter_type, self.start_height, self.stop_hash)
 
 
 class msg_cfheaders:
     __slots__ = ("filter_type", "stop_hash", "prev_header", "hashes")
     msgtype = b"cfheaders"
 
     def __init__(self, filter_type=None, stop_hash=None,
                  prev_header=None, hashes=None):
         self.filter_type = filter_type
         self.stop_hash = stop_hash
         self.prev_header = prev_header
         self.hashes = hashes
 
     def deserialize(self, f):
         self.filter_type = struct.unpack("<B", f.read(1))[0]
         self.stop_hash = deser_uint256(f)
         self.prev_header = deser_uint256(f)
         self.hashes = deser_uint256_vector(f)
 
     def serialize(self):
         r = b""
         r += struct.pack("<B", self.filter_type)
         r += ser_uint256(self.stop_hash)
         r += ser_uint256(self.prev_header)
         r += ser_uint256_vector(self.hashes)
         return r
 
     def __repr__(self):
         return "msg_cfheaders(filter_type={:#x}, stop_hash={:x})".format(
             self.filter_type, self.stop_hash)
 
 
 class msg_getcfcheckpt:
     __slots__ = ("filter_type", "stop_hash")
     msgtype = b"getcfcheckpt"
 
     def __init__(self, filter_type, stop_hash):
         self.filter_type = filter_type
         self.stop_hash = stop_hash
 
     def deserialize(self, f):
         self.filter_type = struct.unpack("<B", f.read(1))[0]
         self.stop_hash = deser_uint256(f)
 
     def serialize(self):
         r = b""
         r += struct.pack("<B", self.filter_type)
         r += ser_uint256(self.stop_hash)
         return r
 
     def __repr__(self):
         return "msg_getcfcheckpt(filter_type={:#x}, stop_hash={:x})".format(
             self.filter_type, self.stop_hash)
 
 
 class msg_cfcheckpt:
     __slots__ = ("filter_type", "stop_hash", "headers")
     msgtype = b"cfcheckpt"
 
     def __init__(self, filter_type=None, stop_hash=None, headers=None):
         self.filter_type = filter_type
         self.stop_hash = stop_hash
         self.headers = headers
 
     def deserialize(self, f):
         self.filter_type = struct.unpack("<B", f.read(1))[0]
         self.stop_hash = deser_uint256(f)
         self.headers = deser_uint256_vector(f)
 
     def serialize(self):
         r = b""
         r += struct.pack("<B", self.filter_type)
         r += ser_uint256(self.stop_hash)
         r += ser_uint256_vector(self.headers)
         return r
 
     def __repr__(self):
         return "msg_cfcheckpt(filter_type={:#x}, stop_hash={:x})".format(
             self.filter_type, self.stop_hash)
 
 
 class msg_avaproof:
     __slots__ = ("proof",)
     msgtype = b"avaproof"
 
     def __init__(self):
         self.proof = AvalancheProof()
 
     def deserialize(self, f):
         self.proof.deserialize(f)
 
     def serialize(self):
         r = b""
         r += self.proof.serialize()
         return r
 
     def __repr__(self):
         return "msg_avaproof(proof={})".format(repr(self.proof))
 
 
 class msg_avapoll:
     __slots__ = ("poll",)
     msgtype = b"avapoll"
 
     def __init__(self):
         self.poll = AvalanchePoll()
 
     def deserialize(self, f):
         self.poll.deserialize(f)
 
     def serialize(self):
         r = b""
         r += self.poll.serialize()
         return r
 
     def __repr__(self):
         return "msg_avapoll(poll={})".format(repr(self.poll))
 
 
 class msg_avaresponse:
     __slots__ = ("response",)
     msgtype = b"avaresponse"
 
     def __init__(self):
         self.response = AvalancheResponse()
 
     def deserialize(self, f):
         self.response.deserialize(f)
 
     def serialize(self):
         r = b""
         r += self.response.serialize()
         return r
 
     def __repr__(self):
         return "msg_avaresponse(response={})".format(repr(self.response))
 
 
 class msg_tcpavaresponse:
     __slots__ = ("response",)
     msgtype = b"avaresponse"
 
     def __init__(self):
         self.response = TCPAvalancheResponse()
 
     def deserialize(self, f):
         self.response.deserialize(f)
 
     def serialize(self):
         r = b""
         r += self.response.serialize()
         return r
 
     def __repr__(self):
         return "msg_tcpavaresponse(response={})".format(repr(self.response))
 
 
 class msg_avahello:
     __slots__ = ("hello",)
     msgtype = b"avahello"
 
     def __init__(self):
         self.hello = AvalancheHello()
 
     def deserialize(self, f):
         self.hello.deserialize(f)
 
     def serialize(self):
         r = b""
         r += self.hello.serialize()
         return r
 
     def __repr__(self):
         return "msg_avahello(response={})".format(repr(self.hello))
 
 
 class msg_getavaaddr:
     __slots__ = ()
     msgtype = b"getavaaddr"
 
     def __init__(self):
         pass
 
     def deserialize(self, f):
         pass
 
     def serialize(self):
         return b""
 
     def __repr__(self):
         return "msg_getavaaddr()"
 
 
 class msg_getavaproofs:
     __slots__ = ()
     msgtype = b"getavaproofs"
 
     def __init__(self):
         pass
 
     def deserialize(self, f):
         pass
 
     def serialize(self):
         return b""
 
     def __repr__(self):
         return "msg_getavaproofs()"
 
 
 class msg_avaproofs:
     __slots__ = ("key0", "key1", "shortids", "prefilled_proofs")
     msgtype = b"avaproofs"
 
     def __init__(self):
         self.key0 = 0
         self.key1 = 0
         self.shortids = []
         self.prefilled_proofs = []
 
     def deserialize(self, f):
         self.key0 = struct.unpack("<Q", f.read(8))[0]
         self.key1 = struct.unpack("<Q", f.read(8))[0]
         shortids_length = deser_compact_size(f)
         for _ in range(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])
 
         # The indices are differentially encoded
         self.prefilled_proofs = deser_vector(f, AvalanchePrefilledProof)
         current_indice = -1
         for p in self.prefilled_proofs:
             current_indice += p.index + 1
             p.index = current_indice
 
     def serialize(self):
         r = b""
         r += struct.pack("<Q", self.key0)
         r += struct.pack("<Q", self.key1)
         r += ser_compact_size(len(self.shortids))
         for shortid in self.shortids:
             # We only want the first 6 bytes
             r += struct.pack("<Q", shortid)[0:6]
 
         r += ser_compact_size(len(self.prefilled_proofs))
         if (len(self.prefilled_proofs) < 1):
             return r
 
         # The indices are differentially encoded
         r += self.prefilled_proofs[0].serialize()
         for i in range(len(self.prefilled_proofs[1:])):
             r += ser_compact_size(
                 self.prefilled_proofs[i + 1].index - self.prefilled_proofs[i].index - 1)
             r += self.prefilled_proofs[i].proof.serialize()
 
         return r
 
     def __repr__(self):
         return "msg_avaproofs(key0={}, key1={}, len(shortids)={}, shortids={}), len(prefilled_proofs)={}, prefilled_proofs={}".format(
             self.key0, self.key1, len(self.shortids), self.shortids, len(self.prefilled_proofs), self.prefilled_proofs)
 
 
 class msg_avaproofsreq:
     __slots__ = ("indices")
     msgtype = b"avaproofsreq"
 
     def __init__(self):
         self.indices = []
 
     def deserialize(self, f):
         indices_length = deser_compact_size(f)
 
         # The indices are differentially encoded
         current_indice = -1
         for _ in range(indices_length):
             current_indice += deser_compact_size(f) + 1
             self.indices.append(current_indice)
 
     def serialize(self):
         r = b""
         r += ser_compact_size(len(self.indices))
 
         if (len(self.indices) < 1):
             return r
 
         # The indices are differentially encoded
         r += ser_compact_size(self.indices[0])
         for i in range(len(self.indices[1:])):
             r += ser_compact_size(self.indices[i + 1] - self.indices[i] - 1)
 
         return r
 
     def __repr__(self):
         return "msg_avaproofsreq(len(shortids)={}, indices={})".format(
             len(self.indices), self.indices)
 
 
 class TestFrameworkMessages(unittest.TestCase):
     def test_avalanche_proof_serialization_round_trip(self):
         """Verify that an AvalancheProof object is unchanged after a round-trip
         of deserialization-serialization.
         """
 
         # Extracted from proof_tests.cpp
         proof_hex = (
             "d97587e6c882615796011ec8f9a7b1c621023beefdde700a6bc02036335b4df141"
             "c8bc67bb05a971f5ac2745fd683797dde30169a79ff23e1d58c64afad42ad81cff"
             "e53967e16beb692fc5776bb442c79c5d91de00cf21804712806594010038e168a3"
             "2102449fb5237efe8f647d32e8b64f06c22d1d40368eaca2a71ffc6a13ecc8bce6"
             "804534ca1f5e22670be3df5cbd5957d8dd83d05c8f17eae391f0e7ffdce4fb3def"
             "adb7c079473ebeccf88c1f8ce87c61e451447b89c445967335ffd1aadef4299823"
             "21023beefdde700a6bc02036335b4df141c8bc67bb05a971f5ac2745fd683797dd"
             "e3ac7b0b7865200f63052ff980b93f965f398dda04917d411dd46e3c009a5fef35"
             "661fac28779b6a22760c00004f5ddf7d9865c7fead7e4a840b947939590261640f"
         )
 
         avaproof = FromHex(AvalancheProof(), proof_hex)
         self.assertEqual(ToHex(avaproof), proof_hex)
 
         self.assertEqual(
             uint256_hex(avaproof.proofid),
             "455f34eb8a00b0799630071c0728481bdb1653035b1484ac33e974aa4ae7db6d"
         )
         self.assertEqual(avaproof.sequence, 6296457553413371353)
         self.assertEqual(avaproof.expiration, -4129334692075929194)
         self.assertEqual(avaproof.master, bytes.fromhex(
             "023beefdde700a6bc02036335b4df141c8bc67bb05a971f5ac2745fd683797dde3"
         ))
         # P2PK to master pubkey
         # We can't use a CScript() here because it would cause a circular
         # import
         self.assertEqual(avaproof.payout_script, bytes.fromhex(
             "21023beefdde700a6bc02036335b4df141c8bc67bb05a971f5ac2745fd683797dde3ac"))
         self.assertEqual(avaproof.signature, b64decode(
             "ewt4ZSAPYwUv+YC5P5ZfOY3aBJF9QR3UbjwAml/vNWYfrCh3m2oidgwAAE9d332YZcf+rX5KhAuUeTlZAmFkDw=="))
 
         self.assertEqual(len(avaproof.stakes), 1)
         self.assertEqual(avaproof.stakes[0].sig, b64decode(
             "RTTKH14iZwvj31y9WVfY3YPQXI8X6uOR8Of/3OT7Pe+tt8B5Rz6+zPiMH4zofGHkUUR7icRFlnM1/9Gq3vQpmA=="))
         self.assertEqual(f"{avaproof.stakes[0].stake.utxo.hash:x}",
                          "915d9cc742b46b77c52f69eb6be16739e5ff1cd82ad4fa4ac6581d3ef29fa769"
                          )
         self.assertEqual(avaproof.stakes[0].stake.utxo.n, 567214302)
         self.assertEqual(avaproof.stakes[0].stake.amount, 444638638000000)
         self.assertEqual(avaproof.stakes[0].stake.height, 1370779804)
         self.assertEqual(avaproof.stakes[0].stake.is_coinbase, False)
         self.assertEqual(avaproof.stakes[0].stake.pubkey, bytes.fromhex(
             "02449fb5237efe8f647d32e8b64f06c22d1d40368eaca2a71ffc6a13ecc8bce680"
         ))
 
         msg_proof = msg_avaproof()
         msg_proof.proof = avaproof
         self.assertEqual(ToHex(msg_proof), proof_hex)