diff --git a/python/src/trezorlib/binance.py b/python/src/trezorlib/binance.py
index ae7aa300d..d8ac31480 100644
--- a/python/src/trezorlib/binance.py
+++ b/python/src/trezorlib/binance.py
@@ -49,9 +49,10 @@ def sign_tx(
     client: "TrezorClient", address_n: "Address", tx_json: dict
 ) -> messages.BinanceSignedTx:
     msg = tx_json["msgs"][0]
-    envelope = dict_to_proto(messages.BinanceSignTx, tx_json)
-    envelope.msg_count = 1
-    envelope.address_n = address_n
+    tx_msg = tx_json.copy()
+    tx_msg["msg_count"] = 1
+    tx_msg["address_n"] = address_n
+    envelope = dict_to_proto(messages.BinanceSignTx, tx_msg)
 
     response = client.call(envelope)
 
diff --git a/python/src/trezorlib/cli/__init__.py b/python/src/trezorlib/cli/__init__.py
index 2d27d6480..6213be026 100644
--- a/python/src/trezorlib/cli/__init__.py
+++ b/python/src/trezorlib/cli/__init__.py
@@ -133,4 +133,6 @@ def with_client(func: "Callable[Concatenate[TrezorClient, P], R]") -> "Callable[
                     except Exception:
                         pass
 
-    return trezorctl_command_with_client
+    # the return type of @click.pass_obj is improperly specified and pyright doesn't
+    # understand that it converts f(obj, *args, **kwargs) to f(*args, **kwargs)
+    return trezorctl_command_with_client  # type: ignore
diff --git a/python/src/trezorlib/cli/firmware.py b/python/src/trezorlib/cli/firmware.py
index 3dfb07156..dfbba0cd4 100644
--- a/python/src/trezorlib/cli/firmware.py
+++ b/python/src/trezorlib/cli/firmware.py
@@ -283,6 +283,8 @@ def find_best_firmware_version(
                 if closest_version > want_version:
                     # stop at first that is higher than the requested
                     break
+            else:
+                raise click.ClickException("No versions were found!")
             # if there was no break, the newest is used
             click.echo(f"Closest available version: {version_str(closest_version)}")
             if not beta and want_version > highest_version:
diff --git a/python/src/trezorlib/eos.py b/python/src/trezorlib/eos.py
index b23fa7842..7be0e5674 100644
--- a/python/src/trezorlib/eos.py
+++ b/python/src/trezorlib/eos.py
@@ -258,11 +258,9 @@ def parse_unknown(data: str) -> messages.EosActionUnknown:
 
 
 def parse_action(action: dict) -> messages.EosTxActionAck:
-    tx_action = messages.EosTxActionAck()
+    tx_action = messages.EosTxActionAck(common=parse_common(action))
+
     data = action["data"]
-
-    tx_action.common = parse_common(action)
-
     if action["account"] == "eosio":
         if action["name"] == "voteproducer":
             tx_action.vote_producer = parse_vote_producer(data)
@@ -337,11 +335,12 @@ def sign_tx(
 ) -> messages.EosSignedTx:
     header, actions = parse_transaction_json(transaction)
 
-    msg = messages.EosSignTx()
-    msg.address_n = address
-    msg.chain_id = bytes.fromhex(chain_id)
-    msg.header = header
-    msg.num_actions = len(actions)
+    msg = messages.EosSignTx(
+        address_n=address,
+        chain_id=bytes.fromhex(chain_id),
+        header=header,
+        num_actions=len(actions),
+    )
 
     response = client.call(msg)
 
diff --git a/python/src/trezorlib/messages.py b/python/src/trezorlib/messages.py
index 3b1fa20be..9548b0a32 100644
--- a/python/src/trezorlib/messages.py
+++ b/python/src/trezorlib/messages.py
@@ -590,32 +590,32 @@ class BinanceSignTx(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = 704
     FIELDS = {
         1: protobuf.Field("address_n", "uint32", repeated=True, required=False),
-        2: protobuf.Field("msg_count", "uint32", repeated=False, required=False),
-        3: protobuf.Field("account_number", "sint64", repeated=False, required=False),
+        2: protobuf.Field("msg_count", "uint32", repeated=False, required=True),
+        3: protobuf.Field("account_number", "sint64", repeated=False, required=True),
         4: protobuf.Field("chain_id", "string", repeated=False, required=False),
         5: protobuf.Field("memo", "string", repeated=False, required=False),
-        6: protobuf.Field("sequence", "sint64", repeated=False, required=False),
-        7: protobuf.Field("source", "sint64", repeated=False, required=False),
+        6: protobuf.Field("sequence", "sint64", repeated=False, required=True),
+        7: protobuf.Field("source", "sint64", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
+        msg_count: "int",
+        account_number: "int",
+        sequence: "int",
+        source: "int",
         address_n: Optional[Sequence["int"]] = None,
-        msg_count: Optional["int"] = None,
-        account_number: Optional["int"] = None,
         chain_id: Optional["str"] = None,
         memo: Optional["str"] = None,
-        sequence: Optional["int"] = None,
-        source: Optional["int"] = None,
     ) -> None:
         self.address_n: Sequence["int"] = address_n if address_n is not None else []
         self.msg_count = msg_count
         self.account_number = account_number
-        self.chain_id = chain_id
-        self.memo = memo
         self.sequence = sequence
         self.source = source
+        self.chain_id = chain_id
+        self.memo = memo
 
 
 class BinanceTxRequest(protobuf.MessageType):
@@ -643,35 +643,35 @@ class BinanceOrderMsg(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = 707
     FIELDS = {
         1: protobuf.Field("id", "string", repeated=False, required=False),
-        2: protobuf.Field("ordertype", "BinanceOrderType", repeated=False, required=False),
-        3: protobuf.Field("price", "sint64", repeated=False, required=False),
-        4: protobuf.Field("quantity", "sint64", repeated=False, required=False),
+        2: protobuf.Field("ordertype", "BinanceOrderType", repeated=False, required=True),
+        3: protobuf.Field("price", "sint64", repeated=False, required=True),
+        4: protobuf.Field("quantity", "sint64", repeated=False, required=True),
         5: protobuf.Field("sender", "string", repeated=False, required=False),
-        6: protobuf.Field("side", "BinanceOrderSide", repeated=False, required=False),
+        6: protobuf.Field("side", "BinanceOrderSide", repeated=False, required=True),
         7: protobuf.Field("symbol", "string", repeated=False, required=False),
-        8: protobuf.Field("timeinforce", "BinanceTimeInForce", repeated=False, required=False),
+        8: protobuf.Field("timeinforce", "BinanceTimeInForce", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
+        ordertype: "BinanceOrderType",
+        price: "int",
+        quantity: "int",
+        side: "BinanceOrderSide",
+        timeinforce: "BinanceTimeInForce",
         id: Optional["str"] = None,
-        ordertype: Optional["BinanceOrderType"] = None,
-        price: Optional["int"] = None,
-        quantity: Optional["int"] = None,
         sender: Optional["str"] = None,
-        side: Optional["BinanceOrderSide"] = None,
         symbol: Optional["str"] = None,
-        timeinforce: Optional["BinanceTimeInForce"] = None,
     ) -> None:
-        self.id = id
         self.ordertype = ordertype
         self.price = price
         self.quantity = quantity
-        self.sender = sender
         self.side = side
-        self.symbol = symbol
         self.timeinforce = timeinforce
+        self.id = id
+        self.sender = sender
+        self.symbol = symbol
 
 
 class BinanceCancelMsg(protobuf.MessageType):
@@ -714,15 +714,15 @@ class BinanceSignedTx(protobuf.MessageType):
 class BinanceInputOutput(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("address", "string", repeated=False, required=False),
+        1: protobuf.Field("address", "string", repeated=False, required=True),
         2: protobuf.Field("coins", "BinanceCoin", repeated=True, required=False),
     }
 
     def __init__(
         self,
         *,
+        address: "str",
         coins: Optional[Sequence["BinanceCoin"]] = None,
-        address: Optional["str"] = None,
     ) -> None:
         self.coins: Sequence["BinanceCoin"] = coins if coins is not None else []
         self.address = address
@@ -731,15 +731,15 @@ class BinanceInputOutput(protobuf.MessageType):
 class BinanceCoin(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("amount", "sint64", repeated=False, required=False),
-        2: protobuf.Field("denom", "string", repeated=False, required=False),
+        1: protobuf.Field("amount", "sint64", repeated=False, required=True),
+        2: protobuf.Field("denom", "string", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        amount: Optional["int"] = None,
-        denom: Optional["str"] = None,
+        amount: "int",
+        denom: "str",
     ) -> None:
         self.amount = amount
         self.denom = denom
@@ -3825,18 +3825,18 @@ class EosSignTx(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = 602
     FIELDS = {
         1: protobuf.Field("address_n", "uint32", repeated=True, required=False),
-        2: protobuf.Field("chain_id", "bytes", repeated=False, required=False),
-        3: protobuf.Field("header", "EosTxHeader", repeated=False, required=False),
-        4: protobuf.Field("num_actions", "uint32", repeated=False, required=False),
+        2: protobuf.Field("chain_id", "bytes", repeated=False, required=True),
+        3: protobuf.Field("header", "EosTxHeader", repeated=False, required=True),
+        4: protobuf.Field("num_actions", "uint32", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
+        chain_id: "bytes",
+        header: "EosTxHeader",
+        num_actions: "int",
         address_n: Optional[Sequence["int"]] = None,
-        chain_id: Optional["bytes"] = None,
-        header: Optional["EosTxHeader"] = None,
-        num_actions: Optional["int"] = None,
     ) -> None:
         self.address_n: Sequence["int"] = address_n if address_n is not None else []
         self.chain_id = chain_id
@@ -3861,7 +3861,7 @@ class EosTxActionRequest(protobuf.MessageType):
 class EosTxActionAck(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = 604
     FIELDS = {
-        1: protobuf.Field("common", "EosActionCommon", repeated=False, required=False),
+        1: protobuf.Field("common", "EosActionCommon", repeated=False, required=True),
         2: protobuf.Field("transfer", "EosActionTransfer", repeated=False, required=False),
         3: protobuf.Field("delegate", "EosActionDelegate", repeated=False, required=False),
         4: protobuf.Field("undelegate", "EosActionUndelegate", repeated=False, required=False),
@@ -3881,7 +3881,7 @@ class EosTxActionAck(protobuf.MessageType):
     def __init__(
         self,
         *,
-        common: Optional["EosActionCommon"] = None,
+        common: "EosActionCommon",
         transfer: Optional["EosActionTransfer"] = None,
         delegate: Optional["EosActionDelegate"] = None,
         undelegate: Optional["EosActionUndelegate"] = None,
@@ -3960,15 +3960,15 @@ class EosTxHeader(protobuf.MessageType):
 class EosAsset(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("amount", "sint64", repeated=False, required=False),
-        2: protobuf.Field("symbol", "uint64", repeated=False, required=False),
+        1: protobuf.Field("amount", "sint64", repeated=False, required=True),
+        2: protobuf.Field("symbol", "uint64", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        amount: Optional["int"] = None,
-        symbol: Optional["int"] = None,
+        amount: "int",
+        symbol: "int",
     ) -> None:
         self.amount = amount
         self.symbol = symbol
@@ -3977,15 +3977,15 @@ class EosAsset(protobuf.MessageType):
 class EosPermissionLevel(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("actor", "uint64", repeated=False, required=False),
-        2: protobuf.Field("permission", "uint64", repeated=False, required=False),
+        1: protobuf.Field("actor", "uint64", repeated=False, required=True),
+        2: protobuf.Field("permission", "uint64", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        actor: Optional["int"] = None,
-        permission: Optional["int"] = None,
+        actor: "int",
+        permission: "int",
     ) -> None:
         self.actor = actor
         self.permission = permission
@@ -4017,15 +4017,15 @@ class EosAuthorizationKey(protobuf.MessageType):
 class EosAuthorizationAccount(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("account", "EosPermissionLevel", repeated=False, required=False),
-        2: protobuf.Field("weight", "uint32", repeated=False, required=False),
+        1: protobuf.Field("account", "EosPermissionLevel", repeated=False, required=True),
+        2: protobuf.Field("weight", "uint32", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        account: Optional["EosPermissionLevel"] = None,
-        weight: Optional["int"] = None,
+        account: "EosPermissionLevel",
+        weight: "int",
     ) -> None:
         self.account = account
         self.weight = weight
@@ -4034,15 +4034,15 @@ class EosAuthorizationAccount(protobuf.MessageType):
 class EosAuthorizationWait(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("wait_sec", "uint32", repeated=False, required=False),
-        2: protobuf.Field("weight", "uint32", repeated=False, required=False),
+        1: protobuf.Field("wait_sec", "uint32", repeated=False, required=True),
+        2: protobuf.Field("weight", "uint32", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        wait_sec: Optional["int"] = None,
-        weight: Optional["int"] = None,
+        wait_sec: "int",
+        weight: "int",
     ) -> None:
         self.wait_sec = wait_sec
         self.weight = weight
@@ -4051,7 +4051,7 @@ class EosAuthorizationWait(protobuf.MessageType):
 class EosAuthorization(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("threshold", "uint32", repeated=False, required=False),
+        1: protobuf.Field("threshold", "uint32", repeated=False, required=True),
         2: protobuf.Field("keys", "EosAuthorizationKey", repeated=True, required=False),
         3: protobuf.Field("accounts", "EosAuthorizationAccount", repeated=True, required=False),
         4: protobuf.Field("waits", "EosAuthorizationWait", repeated=True, required=False),
@@ -4060,10 +4060,10 @@ class EosAuthorization(protobuf.MessageType):
     def __init__(
         self,
         *,
+        threshold: "int",
         keys: Optional[Sequence["EosAuthorizationKey"]] = None,
         accounts: Optional[Sequence["EosAuthorizationAccount"]] = None,
         waits: Optional[Sequence["EosAuthorizationWait"]] = None,
-        threshold: Optional["int"] = None,
     ) -> None:
         self.keys: Sequence["EosAuthorizationKey"] = keys if keys is not None else []
         self.accounts: Sequence["EosAuthorizationAccount"] = accounts if accounts is not None else []
@@ -4074,17 +4074,17 @@ class EosAuthorization(protobuf.MessageType):
 class EosActionCommon(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("account", "uint64", repeated=False, required=False),
-        2: protobuf.Field("name", "uint64", repeated=False, required=False),
+        1: protobuf.Field("account", "uint64", repeated=False, required=True),
+        2: protobuf.Field("name", "uint64", repeated=False, required=True),
         3: protobuf.Field("authorization", "EosPermissionLevel", repeated=True, required=False),
     }
 
     def __init__(
         self,
         *,
+        account: "int",
+        name: "int",
         authorization: Optional[Sequence["EosPermissionLevel"]] = None,
-        account: Optional["int"] = None,
-        name: Optional["int"] = None,
     ) -> None:
         self.authorization: Sequence["EosPermissionLevel"] = authorization if authorization is not None else []
         self.account = account
@@ -4094,19 +4094,19 @@ class EosActionCommon(protobuf.MessageType):
 class EosActionTransfer(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("sender", "uint64", repeated=False, required=False),
-        2: protobuf.Field("receiver", "uint64", repeated=False, required=False),
-        3: protobuf.Field("quantity", "EosAsset", repeated=False, required=False),
-        4: protobuf.Field("memo", "string", repeated=False, required=False),
+        1: protobuf.Field("sender", "uint64", repeated=False, required=True),
+        2: protobuf.Field("receiver", "uint64", repeated=False, required=True),
+        3: protobuf.Field("quantity", "EosAsset", repeated=False, required=True),
+        4: protobuf.Field("memo", "string", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        sender: Optional["int"] = None,
-        receiver: Optional["int"] = None,
-        quantity: Optional["EosAsset"] = None,
-        memo: Optional["str"] = None,
+        sender: "int",
+        receiver: "int",
+        quantity: "EosAsset",
+        memo: "str",
     ) -> None:
         self.sender = sender
         self.receiver = receiver
@@ -4117,21 +4117,21 @@ class EosActionTransfer(protobuf.MessageType):
 class EosActionDelegate(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("sender", "uint64", repeated=False, required=False),
-        2: protobuf.Field("receiver", "uint64", repeated=False, required=False),
-        3: protobuf.Field("net_quantity", "EosAsset", repeated=False, required=False),
-        4: protobuf.Field("cpu_quantity", "EosAsset", repeated=False, required=False),
-        5: protobuf.Field("transfer", "bool", repeated=False, required=False),
+        1: protobuf.Field("sender", "uint64", repeated=False, required=True),
+        2: protobuf.Field("receiver", "uint64", repeated=False, required=True),
+        3: protobuf.Field("net_quantity", "EosAsset", repeated=False, required=True),
+        4: protobuf.Field("cpu_quantity", "EosAsset", repeated=False, required=True),
+        5: protobuf.Field("transfer", "bool", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        sender: Optional["int"] = None,
-        receiver: Optional["int"] = None,
-        net_quantity: Optional["EosAsset"] = None,
-        cpu_quantity: Optional["EosAsset"] = None,
-        transfer: Optional["bool"] = None,
+        sender: "int",
+        receiver: "int",
+        net_quantity: "EosAsset",
+        cpu_quantity: "EosAsset",
+        transfer: "bool",
     ) -> None:
         self.sender = sender
         self.receiver = receiver
@@ -4143,19 +4143,19 @@ class EosActionDelegate(protobuf.MessageType):
 class EosActionUndelegate(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("sender", "uint64", repeated=False, required=False),
-        2: protobuf.Field("receiver", "uint64", repeated=False, required=False),
-        3: protobuf.Field("net_quantity", "EosAsset", repeated=False, required=False),
-        4: protobuf.Field("cpu_quantity", "EosAsset", repeated=False, required=False),
+        1: protobuf.Field("sender", "uint64", repeated=False, required=True),
+        2: protobuf.Field("receiver", "uint64", repeated=False, required=True),
+        3: protobuf.Field("net_quantity", "EosAsset", repeated=False, required=True),
+        4: protobuf.Field("cpu_quantity", "EosAsset", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        sender: Optional["int"] = None,
-        receiver: Optional["int"] = None,
-        net_quantity: Optional["EosAsset"] = None,
-        cpu_quantity: Optional["EosAsset"] = None,
+        sender: "int",
+        receiver: "int",
+        net_quantity: "EosAsset",
+        cpu_quantity: "EosAsset",
     ) -> None:
         self.sender = sender
         self.receiver = receiver
@@ -4166,13 +4166,13 @@ class EosActionUndelegate(protobuf.MessageType):
 class EosActionRefund(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("owner", "uint64", repeated=False, required=False),
+        1: protobuf.Field("owner", "uint64", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        owner: Optional["int"] = None,
+        owner: "int",
     ) -> None:
         self.owner = owner
 
@@ -4180,17 +4180,17 @@ class EosActionRefund(protobuf.MessageType):
 class EosActionBuyRam(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("payer", "uint64", repeated=False, required=False),
-        2: protobuf.Field("receiver", "uint64", repeated=False, required=False),
-        3: protobuf.Field("quantity", "EosAsset", repeated=False, required=False),
+        1: protobuf.Field("payer", "uint64", repeated=False, required=True),
+        2: protobuf.Field("receiver", "uint64", repeated=False, required=True),
+        3: protobuf.Field("quantity", "EosAsset", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        payer: Optional["int"] = None,
-        receiver: Optional["int"] = None,
-        quantity: Optional["EosAsset"] = None,
+        payer: "int",
+        receiver: "int",
+        quantity: "EosAsset",
     ) -> None:
         self.payer = payer
         self.receiver = receiver
@@ -4200,17 +4200,17 @@ class EosActionBuyRam(protobuf.MessageType):
 class EosActionBuyRamBytes(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("payer", "uint64", repeated=False, required=False),
-        2: protobuf.Field("receiver", "uint64", repeated=False, required=False),
-        3: protobuf.Field("bytes", "uint32", repeated=False, required=False),
+        1: protobuf.Field("payer", "uint64", repeated=False, required=True),
+        2: protobuf.Field("receiver", "uint64", repeated=False, required=True),
+        3: protobuf.Field("bytes", "uint32", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        payer: Optional["int"] = None,
-        receiver: Optional["int"] = None,
-        bytes: Optional["int"] = None,
+        payer: "int",
+        receiver: "int",
+        bytes: "int",
     ) -> None:
         self.payer = payer
         self.receiver = receiver
@@ -4220,15 +4220,15 @@ class EosActionBuyRamBytes(protobuf.MessageType):
 class EosActionSellRam(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("account", "uint64", repeated=False, required=False),
-        2: protobuf.Field("bytes", "uint64", repeated=False, required=False),
+        1: protobuf.Field("account", "uint64", repeated=False, required=True),
+        2: protobuf.Field("bytes", "uint64", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        account: Optional["int"] = None,
-        bytes: Optional["int"] = None,
+        account: "int",
+        bytes: "int",
     ) -> None:
         self.account = account
         self.bytes = bytes
@@ -4237,17 +4237,17 @@ class EosActionSellRam(protobuf.MessageType):
 class EosActionVoteProducer(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("voter", "uint64", repeated=False, required=False),
-        2: protobuf.Field("proxy", "uint64", repeated=False, required=False),
+        1: protobuf.Field("voter", "uint64", repeated=False, required=True),
+        2: protobuf.Field("proxy", "uint64", repeated=False, required=True),
         3: protobuf.Field("producers", "uint64", repeated=True, required=False),
     }
 
     def __init__(
         self,
         *,
+        voter: "int",
+        proxy: "int",
         producers: Optional[Sequence["int"]] = None,
-        voter: Optional["int"] = None,
-        proxy: Optional["int"] = None,
     ) -> None:
         self.producers: Sequence["int"] = producers if producers is not None else []
         self.voter = voter
@@ -4257,19 +4257,19 @@ class EosActionVoteProducer(protobuf.MessageType):
 class EosActionUpdateAuth(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("account", "uint64", repeated=False, required=False),
-        2: protobuf.Field("permission", "uint64", repeated=False, required=False),
-        3: protobuf.Field("parent", "uint64", repeated=False, required=False),
-        4: protobuf.Field("auth", "EosAuthorization", repeated=False, required=False),
+        1: protobuf.Field("account", "uint64", repeated=False, required=True),
+        2: protobuf.Field("permission", "uint64", repeated=False, required=True),
+        3: protobuf.Field("parent", "uint64", repeated=False, required=True),
+        4: protobuf.Field("auth", "EosAuthorization", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        account: Optional["int"] = None,
-        permission: Optional["int"] = None,
-        parent: Optional["int"] = None,
-        auth: Optional["EosAuthorization"] = None,
+        account: "int",
+        permission: "int",
+        parent: "int",
+        auth: "EosAuthorization",
     ) -> None:
         self.account = account
         self.permission = permission
@@ -4280,15 +4280,15 @@ class EosActionUpdateAuth(protobuf.MessageType):
 class EosActionDeleteAuth(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("account", "uint64", repeated=False, required=False),
-        2: protobuf.Field("permission", "uint64", repeated=False, required=False),
+        1: protobuf.Field("account", "uint64", repeated=False, required=True),
+        2: protobuf.Field("permission", "uint64", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        account: Optional["int"] = None,
-        permission: Optional["int"] = None,
+        account: "int",
+        permission: "int",
     ) -> None:
         self.account = account
         self.permission = permission
@@ -4297,19 +4297,19 @@ class EosActionDeleteAuth(protobuf.MessageType):
 class EosActionLinkAuth(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("account", "uint64", repeated=False, required=False),
-        2: protobuf.Field("code", "uint64", repeated=False, required=False),
-        3: protobuf.Field("type", "uint64", repeated=False, required=False),
-        4: protobuf.Field("requirement", "uint64", repeated=False, required=False),
+        1: protobuf.Field("account", "uint64", repeated=False, required=True),
+        2: protobuf.Field("code", "uint64", repeated=False, required=True),
+        3: protobuf.Field("type", "uint64", repeated=False, required=True),
+        4: protobuf.Field("requirement", "uint64", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        account: Optional["int"] = None,
-        code: Optional["int"] = None,
-        type: Optional["int"] = None,
-        requirement: Optional["int"] = None,
+        account: "int",
+        code: "int",
+        type: "int",
+        requirement: "int",
     ) -> None:
         self.account = account
         self.code = code
@@ -4320,17 +4320,17 @@ class EosActionLinkAuth(protobuf.MessageType):
 class EosActionUnlinkAuth(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("account", "uint64", repeated=False, required=False),
-        2: protobuf.Field("code", "uint64", repeated=False, required=False),
-        3: protobuf.Field("type", "uint64", repeated=False, required=False),
+        1: protobuf.Field("account", "uint64", repeated=False, required=True),
+        2: protobuf.Field("code", "uint64", repeated=False, required=True),
+        3: protobuf.Field("type", "uint64", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        account: Optional["int"] = None,
-        code: Optional["int"] = None,
-        type: Optional["int"] = None,
+        account: "int",
+        code: "int",
+        type: "int",
     ) -> None:
         self.account = account
         self.code = code
@@ -4340,19 +4340,19 @@ class EosActionUnlinkAuth(protobuf.MessageType):
 class EosActionNewAccount(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("creator", "uint64", repeated=False, required=False),
-        2: protobuf.Field("name", "uint64", repeated=False, required=False),
-        3: protobuf.Field("owner", "EosAuthorization", repeated=False, required=False),
-        4: protobuf.Field("active", "EosAuthorization", repeated=False, required=False),
+        1: protobuf.Field("creator", "uint64", repeated=False, required=True),
+        2: protobuf.Field("name", "uint64", repeated=False, required=True),
+        3: protobuf.Field("owner", "EosAuthorization", repeated=False, required=True),
+        4: protobuf.Field("active", "EosAuthorization", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        creator: Optional["int"] = None,
-        name: Optional["int"] = None,
-        owner: Optional["EosAuthorization"] = None,
-        active: Optional["EosAuthorization"] = None,
+        creator: "int",
+        name: "int",
+        owner: "EosAuthorization",
+        active: "EosAuthorization",
     ) -> None:
         self.creator = creator
         self.name = name
@@ -4364,14 +4364,14 @@ class EosActionUnknown(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
         1: protobuf.Field("data_size", "uint32", repeated=False, required=True),
-        2: protobuf.Field("data_chunk", "bytes", repeated=False, required=False),
+        2: protobuf.Field("data_chunk", "bytes", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
         data_size: "int",
-        data_chunk: Optional["bytes"] = None,
+        data_chunk: "bytes",
     ) -> None:
         self.data_size = data_size
         self.data_chunk = data_chunk
@@ -5773,7 +5773,7 @@ class NEMGetAddress(protobuf.MessageType):
         self,
         *,
         address_n: Optional[Sequence["int"]] = None,
-        network: Optional["int"] = None,
+        network: Optional["int"] = 104,
         show_display: Optional["bool"] = None,
     ) -> None:
         self.address_n: Sequence["int"] = address_n if address_n is not None else []
@@ -5798,7 +5798,7 @@ class NEMAddress(protobuf.MessageType):
 class NEMSignTx(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = 69
     FIELDS = {
-        1: protobuf.Field("transaction", "NEMTransactionCommon", repeated=False, required=False),
+        1: protobuf.Field("transaction", "NEMTransactionCommon", repeated=False, required=True),
         2: protobuf.Field("multisig", "NEMTransactionCommon", repeated=False, required=False),
         3: protobuf.Field("transfer", "NEMTransfer", repeated=False, required=False),
         4: protobuf.Field("cosigning", "bool", repeated=False, required=False),
@@ -5812,7 +5812,7 @@ class NEMSignTx(protobuf.MessageType):
     def __init__(
         self,
         *,
-        transaction: Optional["NEMTransactionCommon"] = None,
+        transaction: "NEMTransactionCommon",
         multisig: Optional["NEMTransactionCommon"] = None,
         transfer: Optional["NEMTransfer"] = None,
         cosigning: Optional["bool"] = None,
@@ -5892,35 +5892,35 @@ class NEMTransactionCommon(protobuf.MessageType):
     FIELDS = {
         1: protobuf.Field("address_n", "uint32", repeated=True, required=False),
         2: protobuf.Field("network", "uint32", repeated=False, required=False),
-        3: protobuf.Field("timestamp", "uint32", repeated=False, required=False),
-        4: protobuf.Field("fee", "uint64", repeated=False, required=False),
-        5: protobuf.Field("deadline", "uint32", repeated=False, required=False),
+        3: protobuf.Field("timestamp", "uint32", repeated=False, required=True),
+        4: protobuf.Field("fee", "uint64", repeated=False, required=True),
+        5: protobuf.Field("deadline", "uint32", repeated=False, required=True),
         6: protobuf.Field("signer", "bytes", repeated=False, required=False),
     }
 
     def __init__(
         self,
         *,
+        timestamp: "int",
+        fee: "int",
+        deadline: "int",
         address_n: Optional[Sequence["int"]] = None,
-        network: Optional["int"] = None,
-        timestamp: Optional["int"] = None,
-        fee: Optional["int"] = None,
-        deadline: Optional["int"] = None,
+        network: Optional["int"] = 104,
         signer: Optional["bytes"] = None,
     ) -> None:
         self.address_n: Sequence["int"] = address_n if address_n is not None else []
-        self.network = network
         self.timestamp = timestamp
         self.fee = fee
         self.deadline = deadline
+        self.network = network
         self.signer = signer
 
 
 class NEMTransfer(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("recipient", "string", repeated=False, required=False),
-        2: protobuf.Field("amount", "uint64", repeated=False, required=False),
+        1: protobuf.Field("recipient", "string", repeated=False, required=True),
+        2: protobuf.Field("amount", "uint64", repeated=False, required=True),
         3: protobuf.Field("payload", "bytes", repeated=False, required=False),
         4: protobuf.Field("public_key", "bytes", repeated=False, required=False),
         5: protobuf.Field("mosaics", "NEMMosaic", repeated=True, required=False),
@@ -5929,10 +5929,10 @@ class NEMTransfer(protobuf.MessageType):
     def __init__(
         self,
         *,
+        recipient: "str",
+        amount: "int",
         mosaics: Optional[Sequence["NEMMosaic"]] = None,
-        recipient: Optional["str"] = None,
-        amount: Optional["int"] = None,
-        payload: Optional["bytes"] = None,
+        payload: Optional["bytes"] = b'',
         public_key: Optional["bytes"] = None,
     ) -> None:
         self.mosaics: Sequence["NEMMosaic"] = mosaics if mosaics is not None else []
@@ -5945,40 +5945,40 @@ class NEMTransfer(protobuf.MessageType):
 class NEMProvisionNamespace(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("namespace", "string", repeated=False, required=False),
+        1: protobuf.Field("namespace", "string", repeated=False, required=True),
         2: protobuf.Field("parent", "string", repeated=False, required=False),
-        3: protobuf.Field("sink", "string", repeated=False, required=False),
-        4: protobuf.Field("fee", "uint64", repeated=False, required=False),
+        3: protobuf.Field("sink", "string", repeated=False, required=True),
+        4: protobuf.Field("fee", "uint64", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        namespace: Optional["str"] = None,
+        namespace: "str",
+        sink: "str",
+        fee: "int",
         parent: Optional["str"] = None,
-        sink: Optional["str"] = None,
-        fee: Optional["int"] = None,
     ) -> None:
         self.namespace = namespace
-        self.parent = parent
         self.sink = sink
         self.fee = fee
+        self.parent = parent
 
 
 class NEMMosaicCreation(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("definition", "NEMMosaicDefinition", repeated=False, required=False),
-        2: protobuf.Field("sink", "string", repeated=False, required=False),
-        3: protobuf.Field("fee", "uint64", repeated=False, required=False),
+        1: protobuf.Field("definition", "NEMMosaicDefinition", repeated=False, required=True),
+        2: protobuf.Field("sink", "string", repeated=False, required=True),
+        3: protobuf.Field("fee", "uint64", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        definition: Optional["NEMMosaicDefinition"] = None,
-        sink: Optional["str"] = None,
-        fee: Optional["int"] = None,
+        definition: "NEMMosaicDefinition",
+        sink: "str",
+        fee: "int",
     ) -> None:
         self.definition = definition
         self.sink = sink
@@ -5988,19 +5988,19 @@ class NEMMosaicCreation(protobuf.MessageType):
 class NEMMosaicSupplyChange(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("namespace", "string", repeated=False, required=False),
-        2: protobuf.Field("mosaic", "string", repeated=False, required=False),
-        3: protobuf.Field("type", "NEMSupplyChangeType", repeated=False, required=False),
-        4: protobuf.Field("delta", "uint64", repeated=False, required=False),
+        1: protobuf.Field("namespace", "string", repeated=False, required=True),
+        2: protobuf.Field("mosaic", "string", repeated=False, required=True),
+        3: protobuf.Field("type", "NEMSupplyChangeType", repeated=False, required=True),
+        4: protobuf.Field("delta", "uint64", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        namespace: Optional["str"] = None,
-        mosaic: Optional["str"] = None,
-        type: Optional["NEMSupplyChangeType"] = None,
-        delta: Optional["int"] = None,
+        namespace: "str",
+        mosaic: "str",
+        type: "NEMSupplyChangeType",
+        delta: "int",
     ) -> None:
         self.namespace = namespace
         self.mosaic = mosaic
@@ -6028,15 +6028,15 @@ class NEMAggregateModification(protobuf.MessageType):
 class NEMImportanceTransfer(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("mode", "NEMImportanceTransferMode", repeated=False, required=False),
-        2: protobuf.Field("public_key", "bytes", repeated=False, required=False),
+        1: protobuf.Field("mode", "NEMImportanceTransferMode", repeated=False, required=True),
+        2: protobuf.Field("public_key", "bytes", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        mode: Optional["NEMImportanceTransferMode"] = None,
-        public_key: Optional["bytes"] = None,
+        mode: "NEMImportanceTransferMode",
+        public_key: "bytes",
     ) -> None:
         self.mode = mode
         self.public_key = public_key
@@ -6045,17 +6045,17 @@ class NEMImportanceTransfer(protobuf.MessageType):
 class NEMMosaic(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("namespace", "string", repeated=False, required=False),
-        2: protobuf.Field("mosaic", "string", repeated=False, required=False),
-        3: protobuf.Field("quantity", "uint64", repeated=False, required=False),
+        1: protobuf.Field("namespace", "string", repeated=False, required=True),
+        2: protobuf.Field("mosaic", "string", repeated=False, required=True),
+        3: protobuf.Field("quantity", "uint64", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        namespace: Optional["str"] = None,
-        mosaic: Optional["str"] = None,
-        quantity: Optional["int"] = None,
+        namespace: "str",
+        mosaic: "str",
+        quantity: "int",
     ) -> None:
         self.namespace = namespace
         self.mosaic = mosaic
@@ -6067,8 +6067,8 @@ class NEMMosaicDefinition(protobuf.MessageType):
     FIELDS = {
         1: protobuf.Field("name", "string", repeated=False, required=False),
         2: protobuf.Field("ticker", "string", repeated=False, required=False),
-        3: protobuf.Field("namespace", "string", repeated=False, required=False),
-        4: protobuf.Field("mosaic", "string", repeated=False, required=False),
+        3: protobuf.Field("namespace", "string", repeated=False, required=True),
+        4: protobuf.Field("mosaic", "string", repeated=False, required=True),
         5: protobuf.Field("divisibility", "uint32", repeated=False, required=False),
         6: protobuf.Field("levy", "NEMMosaicLevy", repeated=False, required=False),
         7: protobuf.Field("fee", "uint64", repeated=False, required=False),
@@ -6078,18 +6078,19 @@ class NEMMosaicDefinition(protobuf.MessageType):
         11: protobuf.Field("supply", "uint64", repeated=False, required=False),
         12: protobuf.Field("mutable_supply", "bool", repeated=False, required=False),
         13: protobuf.Field("transferable", "bool", repeated=False, required=False),
-        14: protobuf.Field("description", "string", repeated=False, required=False),
+        14: protobuf.Field("description", "string", repeated=False, required=True),
         15: protobuf.Field("networks", "uint32", repeated=True, required=False),
     }
 
     def __init__(
         self,
         *,
+        namespace: "str",
+        mosaic: "str",
+        description: "str",
         networks: Optional[Sequence["int"]] = None,
         name: Optional["str"] = None,
         ticker: Optional["str"] = None,
-        namespace: Optional["str"] = None,
-        mosaic: Optional["str"] = None,
         divisibility: Optional["int"] = None,
         levy: Optional["NEMMosaicLevy"] = None,
         fee: Optional["int"] = None,
@@ -6099,13 +6100,13 @@ class NEMMosaicDefinition(protobuf.MessageType):
         supply: Optional["int"] = None,
         mutable_supply: Optional["bool"] = None,
         transferable: Optional["bool"] = None,
-        description: Optional["str"] = None,
     ) -> None:
         self.networks: Sequence["int"] = networks if networks is not None else []
-        self.name = name
-        self.ticker = ticker
         self.namespace = namespace
         self.mosaic = mosaic
+        self.description = description
+        self.name = name
+        self.ticker = ticker
         self.divisibility = divisibility
         self.levy = levy
         self.fee = fee
@@ -6115,21 +6116,20 @@ class NEMMosaicDefinition(protobuf.MessageType):
         self.supply = supply
         self.mutable_supply = mutable_supply
         self.transferable = transferable
-        self.description = description
 
 
 class NEMCosignatoryModification(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("type", "NEMModificationType", repeated=False, required=False),
-        2: protobuf.Field("public_key", "bytes", repeated=False, required=False),
+        1: protobuf.Field("type", "NEMModificationType", repeated=False, required=True),
+        2: protobuf.Field("public_key", "bytes", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        type: Optional["NEMModificationType"] = None,
-        public_key: Optional["bytes"] = None,
+        type: "NEMModificationType",
+        public_key: "bytes",
     ) -> None:
         self.type = type
         self.public_key = public_key
@@ -6170,29 +6170,29 @@ class RippleSignTx(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = 402
     FIELDS = {
         1: protobuf.Field("address_n", "uint32", repeated=True, required=False),
-        2: protobuf.Field("fee", "uint64", repeated=False, required=False),
+        2: protobuf.Field("fee", "uint64", repeated=False, required=True),
         3: protobuf.Field("flags", "uint32", repeated=False, required=False),
-        4: protobuf.Field("sequence", "uint32", repeated=False, required=False),
+        4: protobuf.Field("sequence", "uint32", repeated=False, required=True),
         5: protobuf.Field("last_ledger_sequence", "uint32", repeated=False, required=False),
-        6: protobuf.Field("payment", "RipplePayment", repeated=False, required=False),
+        6: protobuf.Field("payment", "RipplePayment", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
+        fee: "int",
+        sequence: "int",
+        payment: "RipplePayment",
         address_n: Optional[Sequence["int"]] = None,
-        fee: Optional["int"] = None,
-        flags: Optional["int"] = None,
-        sequence: Optional["int"] = None,
+        flags: Optional["int"] = 0,
         last_ledger_sequence: Optional["int"] = None,
-        payment: Optional["RipplePayment"] = None,
     ) -> None:
         self.address_n: Sequence["int"] = address_n if address_n is not None else []
         self.fee = fee
-        self.flags = flags
         self.sequence = sequence
-        self.last_ledger_sequence = last_ledger_sequence
         self.payment = payment
+        self.flags = flags
+        self.last_ledger_sequence = last_ledger_sequence
 
 
 class RippleSignedTx(protobuf.MessageType):
@@ -6975,17 +6975,17 @@ class TezosDelegationOp(protobuf.MessageType):
 class TezosProposalOp(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("source", "bytes", repeated=False, required=False),
-        2: protobuf.Field("period", "uint64", repeated=False, required=False),
+        1: protobuf.Field("source", "bytes", repeated=False, required=True),
+        2: protobuf.Field("period", "uint64", repeated=False, required=True),
         4: protobuf.Field("proposals", "bytes", repeated=True, required=False),
     }
 
     def __init__(
         self,
         *,
+        source: "bytes",
+        period: "int",
         proposals: Optional[Sequence["bytes"]] = None,
-        source: Optional["bytes"] = None,
-        period: Optional["int"] = None,
     ) -> None:
         self.proposals: Sequence["bytes"] = proposals if proposals is not None else []
         self.source = source
@@ -6995,19 +6995,19 @@ class TezosProposalOp(protobuf.MessageType):
 class TezosBallotOp(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("source", "bytes", repeated=False, required=False),
-        2: protobuf.Field("period", "uint64", repeated=False, required=False),
-        3: protobuf.Field("proposal", "bytes", repeated=False, required=False),
-        4: protobuf.Field("ballot", "TezosBallotType", repeated=False, required=False),
+        1: protobuf.Field("source", "bytes", repeated=False, required=True),
+        2: protobuf.Field("period", "uint64", repeated=False, required=True),
+        3: protobuf.Field("proposal", "bytes", repeated=False, required=True),
+        4: protobuf.Field("ballot", "TezosBallotType", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        source: Optional["bytes"] = None,
-        period: Optional["int"] = None,
-        proposal: Optional["bytes"] = None,
-        ballot: Optional["TezosBallotType"] = None,
+        source: "bytes",
+        period: "int",
+        proposal: "bytes",
+        ballot: "TezosBallotType",
     ) -> None:
         self.source = source
         self.period = period
@@ -7038,15 +7038,15 @@ class TezosParametersManager(protobuf.MessageType):
 class TezosManagerTransfer(protobuf.MessageType):
     MESSAGE_WIRE_TYPE = None
     FIELDS = {
-        1: protobuf.Field("destination", "TezosContractID", repeated=False, required=False),
-        2: protobuf.Field("amount", "uint64", repeated=False, required=False),
+        1: protobuf.Field("destination", "TezosContractID", repeated=False, required=True),
+        2: protobuf.Field("amount", "uint64", repeated=False, required=True),
     }
 
     def __init__(
         self,
         *,
-        destination: Optional["TezosContractID"] = None,
-        amount: Optional["int"] = None,
+        destination: "TezosContractID",
+        amount: "int",
     ) -> None:
         self.destination = destination
         self.amount = amount
diff --git a/python/src/trezorlib/nem.py b/python/src/trezorlib/nem.py
index 63442066a..4d3e06261 100644
--- a/python/src/trezorlib/nem.py
+++ b/python/src/trezorlib/nem.py
@@ -36,11 +36,12 @@ TYPE_MOSAIC_SUPPLY_CHANGE = 0x4002
 
 
 def create_transaction_common(transaction: dict) -> messages.NEMTransactionCommon:
-    msg = messages.NEMTransactionCommon()
-    msg.network = (transaction["version"] >> 24) & 0xFF
-    msg.timestamp = transaction["timeStamp"]
-    msg.fee = transaction["fee"]
-    msg.deadline = transaction["deadline"]
+    msg = messages.NEMTransactionCommon(
+        network=(transaction["version"] >> 24) & 0xFF,
+        timestamp=transaction["timeStamp"],
+        fee=transaction["fee"],
+        deadline=transaction["deadline"],
+    )
 
     if "signer" in transaction:
         msg.signer = bytes.fromhex(transaction["signer"])
@@ -49,9 +50,9 @@ def create_transaction_common(transaction: dict) -> messages.NEMTransactionCommo
 
 
 def create_transfer(transaction: dict) -> messages.NEMTransfer:
-    msg = messages.NEMTransfer()
-    msg.recipient = transaction["recipient"]
-    msg.amount = transaction["amount"]
+    msg = messages.NEMTransfer(
+        recipient=transaction["recipient"], amount=transaction["amount"]
+    )
 
     if "payload" in transaction["message"]:
         msg.payload = bytes.fromhex(transaction["message"]["payload"])
@@ -75,14 +76,15 @@ def create_transfer(transaction: dict) -> messages.NEMTransfer:
 def create_aggregate_modification(
     transaction: dict,
 ) -> messages.NEMAggregateModification:
-    msg = messages.NEMAggregateModification()
-    msg.modifications = [
-        messages.NEMCosignatoryModification(
-            type=modification["modificationType"],
-            public_key=bytes.fromhex(modification["cosignatoryAccount"]),
-        )
-        for modification in transaction["modifications"]
-    ]
+    msg = messages.NEMAggregateModification(
+        modifications=[
+            messages.NEMCosignatoryModification(
+                type=modification["modificationType"],
+                public_key=bytes.fromhex(modification["cosignatoryAccount"]),
+            )
+            for modification in transaction["modifications"]
+        ]
+    )
 
     if "minCosignatories" in transaction:
         msg.relative_change = transaction["minCosignatories"]["relativeChange"]
@@ -91,65 +93,68 @@ def create_aggregate_modification(
 
 
 def create_provision_namespace(transaction: dict) -> messages.NEMProvisionNamespace:
-    msg = messages.NEMProvisionNamespace()
-    msg.namespace = transaction["newPart"]
+    msg = messages.NEMProvisionNamespace(
+        sink=transaction["rentalFeeSink"],
+        fee=transaction["rentalFee"],
+        namespace=transaction["newPart"],
+    )
 
     if transaction["parent"]:
         msg.parent = transaction["parent"]
 
-    msg.sink = transaction["rentalFeeSink"]
-    msg.fee = transaction["rentalFee"]
     return msg
 
 
 def create_mosaic_creation(transaction: dict) -> messages.NEMMosaicCreation:
-    definition = transaction["mosaicDefinition"]
-    msg = messages.NEMMosaicCreation()
-    msg.definition = messages.NEMMosaicDefinition()
-    msg.definition.namespace = definition["id"]["namespaceId"]
-    msg.definition.mosaic = definition["id"]["name"]
+    definition_dict = transaction["mosaicDefinition"]
 
-    if definition["levy"]:
-        msg.definition.levy = definition["levy"]["type"]
-        msg.definition.fee = definition["levy"]["fee"]
-        msg.definition.levy_address = definition["levy"]["recipient"]
-        msg.definition.levy_namespace = definition["levy"]["mosaicId"]["namespaceId"]
-        msg.definition.levy_mosaic = definition["levy"]["mosaicId"]["name"]
+    definition = messages.NEMMosaicDefinition(
+        namespace=definition_dict["id"]["namespaceId"],
+        mosaic=definition_dict["id"]["name"],
+        description=definition_dict["description"],
+    )
 
-    msg.definition.description = definition["description"]
+    if definition_dict["levy"]:
+        definition.levy = definition_dict["levy"]["type"]
+        definition.fee = definition_dict["levy"]["fee"]
+        definition.levy_address = definition_dict["levy"]["recipient"]
+        definition.levy_namespace = definition_dict["levy"]["mosaicId"]["namespaceId"]
+        definition.levy_mosaic = definition_dict["levy"]["mosaicId"]["name"]
 
-    for property in definition["properties"]:
+    for property in definition_dict["properties"]:
         name = property["name"]
         value = json.loads(property["value"])
 
         if name == "divisibility":
-            msg.definition.divisibility = value
+            definition.divisibility = value
         elif name == "initialSupply":
-            msg.definition.supply = value
+            definition.supply = value
         elif name == "supplyMutable":
-            msg.definition.mutable_supply = value
+            definition.mutable_supply = value
         elif name == "transferable":
-            msg.definition.transferable = value
+            definition.transferable = value
 
-    msg.sink = transaction["creationFeeSink"]
-    msg.fee = transaction["creationFee"]
-    return msg
+    return messages.NEMMosaicCreation(
+        definition=definition,
+        sink=transaction["creationFeeSink"],
+        fee=transaction["creationFee"],
+    )
 
 
 def create_supply_change(transaction: dict) -> messages.NEMMosaicSupplyChange:
-    msg = messages.NEMMosaicSupplyChange()
-    msg.namespace = transaction["mosaicId"]["namespaceId"]
-    msg.mosaic = transaction["mosaicId"]["name"]
-    msg.type = transaction["supplyType"]
-    msg.delta = transaction["delta"]
-    return msg
+    return messages.NEMMosaicSupplyChange(
+        namespace=transaction["mosaicId"]["namespaceId"],
+        mosaic=transaction["mosaicId"]["name"],
+        type=transaction["supplyType"],
+        delta=transaction["delta"],
+    )
 
 
 def create_importance_transfer(transaction: dict) -> messages.NEMImportanceTransfer:
-    msg = messages.NEMImportanceTransfer()
-    msg.mode = transaction["importanceTransfer"]["mode"]
-    msg.public_key = bytes.fromhex(transaction["importanceTransfer"]["publicKey"])
-    return msg
+    return messages.NEMImportanceTransfer(
+        mode=transaction["importanceTransfer"]["mode"],
+        public_key=bytes.fromhex(transaction["importanceTransfer"]["publicKey"]),
+    )
 
 
 def fill_transaction_by_type(msg: messages.NEMSignTx, transaction: dict) -> None:
@@ -170,9 +175,10 @@ def fill_transaction_by_type(msg: messages.NEMSignTx, transaction: dict) -> None
 
 
 def create_sign_tx(transaction: dict) -> messages.NEMSignTx:
-    msg = messages.NEMSignTx()
-    msg.transaction = create_transaction_common(transaction)
-    msg.cosigning = transaction["type"] == TYPE_MULTISIG_SIGNATURE
+    msg = messages.NEMSignTx(
+        transaction=create_transaction_common(transaction),
+        cosigning=transaction["type"] == TYPE_MULTISIG_SIGNATURE,
+    )
 
     if transaction["type"] in (TYPE_MULTISIG_SIGNATURE, TYPE_MULTISIG):
         other_trans = transaction["otherTrans"]