diff --git a/core/src/all_modules.py b/core/src/all_modules.py
index 50a7aa3b7f..cc0615941a 100644
--- a/core/src/all_modules.py
+++ b/core/src/all_modules.py
@@ -491,6 +491,8 @@ if not utils.BITCOIN_ONLY:
     import apps.eos.writers
     apps.ethereum
     import apps.ethereum
+    apps.ethereum.definitions
+    import apps.ethereum.definitions
     apps.ethereum.get_address
     import apps.ethereum.get_address
     apps.ethereum.get_public_key
diff --git a/core/src/apps/ethereum/definitions.py b/core/src/apps/ethereum/definitions.py
new file mode 100644
index 0000000000..31b8d8541c
--- /dev/null
+++ b/core/src/apps/ethereum/definitions.py
@@ -0,0 +1,192 @@
+from collections import defaultdict
+from typing import TYPE_CHECKING, Tuple
+
+from apps.ethereum import tokens
+
+from trezor import protobuf, wire
+from trezor.crypto.curve import ed25519
+from trezor.enums import EthereumDefinitionType
+from trezor.messages import EthereumNetworkInfo, EthereumTokenInfo
+
+from . import networks
+
+if TYPE_CHECKING:
+    from trezor.protobuf import MessageType
+
+    from .networks import NetworkInfo
+    from .tokens import TokenInfo
+
+
+DEFINITIONS_PUBLIC_KEY = b""
+MIN_DATA_VERSION = 1
+FORMAT_VERSION = "trzd1"
+
+if __debug__:
+    DEFINITIONS_DEV_PUBLIC_KEY = b""
+
+
+class EthereumDefinitionParser:
+    def __init__(self, definition_bytes: bytes) -> None:
+        if len(definition_bytes) <= (8 + 1 + 4 + 64):
+            raise wire.DataError("Received Ethereum definition is probably malformed (too few data).")
+
+        self.format_version: str = definition_bytes[:8].rstrip(b'\0').decode("utf-8")
+        self.definition_type: int = definition_bytes[8]
+        self.data_version: int = int.from_bytes(definition_bytes[9:13], 'big')
+        self.clean_payload = definition_bytes[13:-64]
+        self.payload = definition_bytes[:-64]
+        self.signature = definition_bytes[-64:]
+
+
+def decode_definition(
+    definition: bytes, expected_type: EthereumDefinitionType
+) -> NetworkInfo | TokenInfo:
+    # check network definition
+    parsed_definition = EthereumDefinitionParser(definition)
+
+    # first check format version
+    if parsed_definition.format_version != FORMAT_VERSION:
+        raise wire.DataError("Used different Ethereum definition format version.")
+
+    # second check the type of the data
+    if parsed_definition.definition_type != expected_type:
+        raise wire.DataError("Definition of invalid type for Ethereum.")
+
+    # third check data version
+    if parsed_definition.data_version < MIN_DATA_VERSION:
+        raise wire.DataError("Used Ethereum definition data version too low.")
+
+    # at the end verify the signature
+    if not ed25519.verify(DEFINITIONS_PUBLIC_KEY, parsed_definition.signature, parsed_definition.payload):
+        error_msg = wire.DataError("Ethereum definition signature is invalid.")
+        if __debug__:
+            # check against dev key
+            if not ed25519.verify(DEFINITIONS_DEV_PUBLIC_KEY, parsed_definition.signature, parsed_definition.payload):
+                raise error_msg
+        else:
+            raise error_msg
+
+    # decode it if it's OK
+    if expected_type == EthereumDefinitionType.NETWORK:
+        info = protobuf.decode(parsed_definition.payload, EthereumNetworkInfo, True)
+
+        # TODO: temporarily convert to internal class
+        if info is not None:
+            from .networks import NetworkInfo
+            info = NetworkInfo(
+                chain_id=info.chain_id,
+                slip44=info.slip44,
+                shortcut=info.shortcut,
+                name=info.name,
+                rskip60=info.rskip60
+            )
+    else:
+        info = protobuf.decode(parsed_definition.payload, EthereumTokenInfo, True)
+
+        # TODO: temporarily convert to internal class
+        if info is not None:
+            from .tokens import TokenInfo
+            info = TokenInfo(
+                symbol=info.symbol,
+                decimals=info.decimals,
+                address=info.address,
+                chain_id=info.chain_id,
+                name=info.name,
+            )
+
+    return info
+
+
+def _get_network_definiton(encoded_network_definition: bytes | None, ref_chain_id: int | None = None) -> NetworkInfo | None:
+    if encoded_network_definition is None and ref_chain_id is None:
+        return None
+
+    if ref_chain_id is not None:
+        # if we have a built-in definition, use it
+        network = networks.by_chain_id(ref_chain_id)
+        if network is not None:
+            return network
+
+    if encoded_network_definition is not None:
+        # get definition if it was send
+        network = decode_definition(encoded_network_definition, EthereumDefinitionType.NETWORK)
+
+        # check referential chain_id with encoded chain_id
+        if network.chain_id != ref_chain_id:
+            raise wire.DataError("Invalid network definition - chain IDs not equal.")
+
+        return network
+
+    return None
+
+
+def _get_token_definiton(encoded_token_definition: bytes | None, ref_chain_id: int | None = None, ref_address: int | None = None) -> TokenInfo:
+    if encoded_token_definition is None and (ref_chain_id is None or ref_address is None):
+        return None
+
+    # if we have a built-in definition, use it
+    if ref_chain_id is not None and ref_address is not None:
+        token = tokens.token_by_chain_address(ref_chain_id, ref_address)
+        if token is not tokens.UNKNOWN_TOKEN:
+            return token
+
+    if encoded_token_definition is not None:
+        # get definition if it was send
+        token = decode_definition(encoded_token_definition, EthereumDefinitionType.TOKEN)
+
+        # check token against ref_chain_id and ref_address
+        if (
+            (ref_chain_id is None or token.chain_id == ref_chain_id)
+            and (ref_address is None or token.address == ref_address)
+        ):
+            return token
+
+    return tokens.UNKNOWN_TOKEN
+
+
+class EthereumDefinitions:
+    """Class that holds Ethereum definitions - network and tokens. Prefers built-in definitions over encoded ones."""
+    def __init__(
+        self,
+        encoded_network_definition: bytes | None = None,
+        encoded_token_definition: bytes | None = None,
+        ref_chain_id: int | None = None,
+        ref_token_address: int | None = None,
+    ) -> None:
+        self.network = _get_network_definiton(encoded_network_definition, ref_chain_id)
+        self.token_dict: defaultdict[bytes, TokenInfo] = defaultdict(lambda: tokens.UNKNOWN_TOKEN)
+
+        # if we have some network, we can try to get token
+        if self.network is not None:
+            received_token = _get_token_definiton(encoded_token_definition, self.network.chain_id, ref_token_address)
+            if received_token is not tokens.UNKNOWN_TOKEN:
+                self.token_dict[received_token.address] = received_token
+
+
+def get_definitions_from_msg(msg: MessageType) -> EthereumDefinitions:
+    encoded_network_definition: bytes | None = None
+    encoded_token_definition: bytes | None = None
+    chain_id: int | None = None
+    token_address: int | None = None
+
+    # first try to get both definitions
+    try:
+        if msg.definitions is not None:
+            encoded_network_definition = msg.definitions.encoded_network
+            encoded_token_definition = msg.definitions.encoded_token
+    except AttributeError:
+        encoded_network_definition = msg.encoded_network
+
+    # get chain_id
+    try:
+        chain_id = msg.chain_id
+    except AttributeError:
+        pass
+
+    # get token_address
+    try:
+        token_address = msg.to
+    except AttributeError:
+        pass
+
+    return EthereumDefinitions(encoded_network_definition, encoded_token_definition, chain_id, token_address)
diff --git a/core/src/apps/ethereum/get_address.py b/core/src/apps/ethereum/get_address.py
index f33a5390a7..f031a77bd3 100644
--- a/core/src/apps/ethereum/get_address.py
+++ b/core/src/apps/ethereum/get_address.py
@@ -1,6 +1,13 @@
 from typing import TYPE_CHECKING
 
-from .keychain import PATTERNS_ADDRESS, with_keychain_from_path
+from trezor.messages import EthereumAddress
+from trezor.ui.layouts import show_address
+
+from apps.common import paths
+
+from . import networks
+from .helpers import address_from_bytes
+from .keychain import PATTERNS_ADDRESS, with_keychain_from_path_and_defs
 
 if TYPE_CHECKING:
     from trezor.messages import EthereumGetAddress, EthereumAddress
@@ -8,10 +15,12 @@ if TYPE_CHECKING:
 
     from apps.common.keychain import Keychain
 
+    from . import definitions
 
-@with_keychain_from_path(*PATTERNS_ADDRESS)
+
+@with_keychain_from_path_and_defs(*PATTERNS_ADDRESS)
 async def get_address(
-    ctx: Context, msg: EthereumGetAddress, keychain: Keychain
+    ctx: Context, msg: EthereumGetAddress, keychain: Keychain, defs: definitions.EthereumDefinitions
 ) -> EthereumAddress:
     from trezor.messages import EthereumAddress
     from trezor.ui.layouts import show_address
@@ -25,8 +34,12 @@ async def get_address(
 
     node = keychain.derive(address_n)
 
-    if len(address_n) > 1:  # path has slip44 network identifier
-        network = networks.by_slip44(address_n[1] & 0x7FFF_FFFF)
+    if len(msg.address_n) > 1:  # path has slip44 network identifier
+        slip44 = msg.address_n[1] & 0x7FFF_FFFF
+        if slip44 == defs.network.slip44:
+            network = defs.network
+        else:
+            network = networks.by_slip44(slip44)
     else:
         network = None
     address = address_from_bytes(node.ethereum_pubkeyhash(), network)
diff --git a/core/src/apps/ethereum/helpers.py b/core/src/apps/ethereum/helpers.py
index 7560522824..5f931f4593 100644
--- a/core/src/apps/ethereum/helpers.py
+++ b/core/src/apps/ethereum/helpers.py
@@ -1,12 +1,14 @@
 from typing import TYPE_CHECKING
 from ubinascii import hexlify
 
+from .networks import by_chain_id
+
 if TYPE_CHECKING:
     from trezor.messages import EthereumFieldType
     from .networks import NetworkInfo
 
 
-def address_from_bytes(address_bytes: bytes, network: NetworkInfo | None = None) -> str:
+def address_from_bytes(address_bytes: bytes, network: NetworkInfo = by_chain_id(1)) -> str:
     """
     Converts address in bytes to a checksummed string as defined
     in https://github.com/ethereum/EIPs/blob/master/EIPS/eip-55.md
diff --git a/core/src/apps/ethereum/keychain.py b/core/src/apps/ethereum/keychain.py
index 8243b2942d..81a4748c79 100644
--- a/core/src/apps/ethereum/keychain.py
+++ b/core/src/apps/ethereum/keychain.py
@@ -3,10 +3,12 @@ from typing import TYPE_CHECKING
 from apps.common import paths
 from apps.common.keychain import get_keychain
 
-from . import CURVE, networks
+from . import CURVE, networks, definitions
 
 if TYPE_CHECKING:
-    from typing import Callable, Iterable, TypeVar
+    from typing import Awaitable, Callable, Iterable, TypeVar
+
+    from apps.common.keychain import Keychain
 
     from trezor.wire import Context
 
@@ -19,19 +21,17 @@ if TYPE_CHECKING:
         EthereumSignTypedData,
     )
 
-    from apps.common.keychain import MsgOut, Handler, HandlerWithKeychain
+    from apps.common.keychain import MsgIn as MsgInGeneric, MsgOut, Handler, HandlerWithKeychain
 
-    EthereumMessages = (
-        EthereumGetAddress
-        | EthereumGetPublicKey
-        | EthereumSignTx
-        | EthereumSignMessage
-        | EthereumSignTypedData
-    )
-    MsgIn = TypeVar("MsgIn", bound=EthereumMessages)
+    # messages for "with_keychain_from_path" decorator
+    MsgInKeychainPath = TypeVar("MsgInKeychainPath", bound=EthereumGetPublicKey)
+    # messages for "with_keychain_from_path_and_defs" decorator
+    MsgInKeychainPathDefs = TypeVar("MsgInKeychainPathDefs", bound=EthereumGetAddress | EthereumSignMessage | EthereumSignTypedData)
+    # messages for "with_keychain_from_chain_id_and_defs" decorator
+    MsgInKeychainChainIdDefs = TypeVar("MsgInKeychainChainIdDefs", bound=EthereumSignTx | EthereumSignTxEIP1559)
 
-    EthereumSignTxAny = EthereumSignTx | EthereumSignTxEIP1559
-    MsgInChainId = TypeVar("MsgInChainId", bound=EthereumSignTxAny)
+    # TODO: check the types of messages
+    HandlerWithKeychainAndDefinitions = Callable[[Context, MsgInGeneric, Keychain, definitions.EthereumDefinitions], Awaitable[MsgOut]]
 
 
 # We believe Ethereum should use 44'/60'/a' for everything, because it is
@@ -48,13 +48,20 @@ PATTERNS_ADDRESS = (
 
 
 def _schemas_from_address_n(
-    patterns: Iterable[str], address_n: paths.Bip32Path
+    patterns: Iterable[str], address_n: paths.Bip32Path, network_info: networks.NetworkInfo | None
 ) -> Iterable[paths.PathSchema]:
     if len(address_n) < 2:
         return ()
 
     slip44_hardened = address_n[1]
-    if slip44_hardened not in networks.all_slip44_ids_hardened():
+
+    def _get_hardened_slip44_networks():
+        if network_info is not None:
+            yield network_info.slip44 | paths.HARDENED
+        yield from networks.all_slip44_ids_hardened()
+
+    # check with network from definitions and if that is None then with built-in ones
+    if slip44_hardened not in _get_hardened_slip44_networks():
         return ()
 
     if not slip44_hardened & paths.HARDENED:
@@ -67,10 +74,11 @@ def _schemas_from_address_n(
 
 def with_keychain_from_path(
     *patterns: str,
-) -> Callable[[HandlerWithKeychain[MsgIn, MsgOut]], Handler[MsgIn, MsgOut]]:
-    def decorator(func: HandlerWithKeychain[MsgIn, MsgOut]) -> Handler[MsgIn, MsgOut]:
-        async def wrapper(ctx: Context, msg: MsgIn) -> MsgOut:
-            schemas = _schemas_from_address_n(patterns, msg.address_n)
+) -> Callable[[HandlerWithKeychain[MsgInKeychainPath, MsgOut]], Handler[MsgInKeychainPath, MsgOut]]:
+    def decorator(func: HandlerWithKeychain[MsgInKeychainPath, MsgOut]) -> Handler[MsgInKeychainPath, MsgOut]:
+        async def wrapper(ctx: Context, msg: MsgInKeychainPath) -> MsgOut:
+            defs = definitions.get_definitions_from_msg(msg)
+            schemas = _schemas_from_address_n(patterns, msg.address_n, defs.network)
             keychain = await get_keychain(ctx, CURVE, schemas)
             with keychain:
                 return await func(ctx, msg, keychain)
@@ -80,17 +88,32 @@ def with_keychain_from_path(
     return decorator
 
 
-def _schemas_from_chain_id(msg: EthereumSignTxAny) -> Iterable[paths.PathSchema]:
-    info = networks.by_chain_id(msg.chain_id)
+def with_keychain_from_path_and_defs(
+    *patterns: str,
+) -> Callable[[HandlerWithKeychainAndDefinitions[MsgInKeychainPathDefs, MsgOut]], Handler[MsgInKeychainPathDefs, MsgOut]]:
+    def decorator(func: HandlerWithKeychainAndDefinitions[MsgInKeychainPathDefs, MsgOut]) -> Handler[MsgInKeychainPathDefs, MsgOut]:
+        async def wrapper(ctx: Context, msg: MsgInKeychainPathDefs) -> MsgOut:
+            defs = definitions.get_definitions_from_msg(msg)
+            schemas = _schemas_from_address_n(patterns, msg.address_n, defs.network)
+            keychain = await get_keychain(ctx, CURVE, schemas)
+            with keychain:
+                return await func(ctx, msg, keychain, defs)
+
+        return wrapper
+
+    return decorator
+
+
+def _schemas_from_chain_id(network_info: networks.NetworkInfo | None) -> Iterable[paths.PathSchema]:
     slip44_id: tuple[int, ...]
-    if info is None:
+    if network_info is None:
         # allow Ethereum or testnet paths for unknown networks
         slip44_id = (60, 1)
-    elif info.slip44 not in (60, 1):
+    elif network_info.slip44 not in (60, 1):
         # allow cross-signing with Ethereum unless it's testnet
-        slip44_id = (info.slip44, 60)
+        slip44_id = (network_info.slip44, 60)
     else:
-        slip44_id = (info.slip44,)
+        slip44_id = (network_info.slip44,)
 
     schemas = [
         paths.PathSchema.parse(pattern, slip44_id) for pattern in PATTERNS_ADDRESS
@@ -98,14 +121,15 @@ def _schemas_from_chain_id(msg: EthereumSignTxAny) -> Iterable[paths.PathSchema]
     return [s.copy() for s in schemas]
 
 
-def with_keychain_from_chain_id(
-    func: HandlerWithKeychain[MsgInChainId, MsgOut]
-) -> Handler[MsgInChainId, MsgOut]:
+def with_keychain_from_chain_id_and_defs(
+    func: HandlerWithKeychainAndDefinitions[MsgInKeychainChainIdDefs, MsgOut]
+) -> Handler[MsgInKeychainChainIdDefs, MsgOut]:
     # this is only for SignTx, and only PATTERN_ADDRESS is allowed
-    async def wrapper(ctx: Context, msg: MsgInChainId) -> MsgOut:
-        schemas = _schemas_from_chain_id(msg)
+    async def wrapper(ctx: Context, msg: MsgInKeychainChainIdDefs) -> MsgOut:
+        defs = definitions.get_definitions_from_msg(msg)
+        schemas = _schemas_from_chain_id(defs.network)
         keychain = await get_keychain(ctx, CURVE, schemas)
         with keychain:
-            return await func(ctx, msg, keychain)
+            return await func(ctx, msg, keychain, defs)
 
     return wrapper
diff --git a/core/src/apps/ethereum/layout.py b/core/src/apps/ethereum/layout.py
index 72513517f9..825a818614 100644
--- a/core/src/apps/ethereum/layout.py
+++ b/core/src/apps/ethereum/layout.py
@@ -12,7 +12,7 @@ from trezor.ui.layouts import (
 )
 
 from . import networks
-from .helpers import decode_typed_data
+from .helpers import address_from_bytes, decode_typed_data, get_type_name
 
 if TYPE_CHECKING:
     from typing import Awaitable, Iterable
@@ -21,25 +21,29 @@ if TYPE_CHECKING:
     from trezor.wire import Context
     from . import tokens
 
+    from . import tokens
+
 
 def require_confirm_tx(
     ctx: Context,
     to_bytes: bytes,
     value: int,
-    chain_id: int,
-    token: tokens.TokenInfo | None = None,
+    network: networks.NetworkInfo,
+    token: tokens.TokenInfo,
 ) -> Awaitable[None]:
     from .helpers import address_from_bytes
     from trezor.ui.layouts import confirm_output
 
     if to_bytes:
-        to_str = address_from_bytes(to_bytes, networks.by_chain_id(chain_id))
+        to_str = address_from_bytes(to_bytes, network)
     else:
         to_str = "new contract?"
     return confirm_output(
         ctx,
-        to_str,
-        format_ethereum_amount(value, token, chain_id),
+        address=to_str,
+        amount=format_ethereum_amount(value, token, network),
+        font_amount=ui.BOLD,
+        color_to=ui.GREY,
         br_code=ButtonRequestType.SignTx,
     )
 
@@ -49,19 +53,19 @@ async def require_confirm_fee(
     spending: int,
     gas_price: int,
     gas_limit: int,
-    chain_id: int,
-    token: tokens.TokenInfo | None = None,
+    network: networks.NetworkInfo,
+    token: tokens.TokenInfo,
 ) -> None:
     await confirm_amount(
         ctx,
         title="Confirm fee",
         description="Gas price:",
-        amount=format_ethereum_amount(gas_price, None, chain_id),
+        amount=format_ethereum_amount(gas_price, None, network),
     )
     await confirm_total(
         ctx,
-        total_amount=format_ethereum_amount(spending, token, chain_id),
-        fee_amount=format_ethereum_amount(gas_price * gas_limit, None, chain_id),
+        total_amount=format_ethereum_amount(spending, token, network),
+        fee_amount=format_ethereum_amount(gas_price * gas_limit, None, network),
         total_label="Amount sent:",
         fee_label="Maximum fee:",
     )
@@ -73,25 +77,25 @@ async def require_confirm_eip1559_fee(
     max_priority_fee: int,
     max_gas_fee: int,
     gas_limit: int,
-    chain_id: int,
-    token: tokens.TokenInfo | None = None,
+    network: networks.NetworkInfo,
+    token: tokens.TokenInfo,
 ) -> None:
     await confirm_amount(
         ctx,
         "Confirm fee",
-        format_ethereum_amount(max_gas_fee, None, chain_id),
+        format_ethereum_amount(max_gas_fee, None, network),
         "Maximum fee per gas",
     )
     await confirm_amount(
         ctx,
         "Confirm fee",
-        format_ethereum_amount(max_priority_fee, None, chain_id),
+        format_ethereum_amount(max_priority_fee, None, network),
         "Priority fee per gas",
     )
     await confirm_total(
         ctx,
-        format_ethereum_amount(spending, token, chain_id),
-        format_ethereum_amount(max_gas_fee * gas_limit, None, chain_id),
+        format_ethereum_amount(spending, token, network),
+        format_ethereum_amount(max_gas_fee * gas_limit, None, network),
         total_label="Amount sent:",
         fee_label="Maximum fee:",
     )
@@ -249,7 +253,7 @@ async def confirm_typed_value(
 
 
 def format_ethereum_amount(
-    value: int, token: tokens.TokenInfo | None, chain_id: int
+    value: int, token: tokens.TokenInfo | None, network_info: networks.NetworkInfo | None
 ) -> str:
     from trezor.strings import format_amount
 
@@ -257,7 +261,10 @@ def format_ethereum_amount(
         suffix = token.symbol
         decimals = token.decimals
     else:
-        suffix = networks.shortcut_by_chain_id(chain_id)
+        if network_info is not None:
+            suffix = network_info.shortcut
+        else:
+            suffix = networks.UNKNOWN_NETWORK_SHORTCUT
         decimals = 18
 
     # Don't want to display wei values for tokens with small decimal numbers
diff --git a/core/src/apps/ethereum/networks.py b/core/src/apps/ethereum/networks.py
index 26730b04b5..5ea30cea84 100644
--- a/core/src/apps/ethereum/networks.py
+++ b/core/src/apps/ethereum/networks.py
@@ -22,11 +22,12 @@ if TYPE_CHECKING:
         bool  # rskip60
     ]
     # fmt: on
+UNKNOWN_NETWORK_SHORTCUT = "UNKN"
 
 
 def shortcut_by_chain_id(chain_id: int) -> str:
     n = by_chain_id(chain_id)
-    return n.shortcut if n is not None else "UNKN"
+    return n.shortcut if n is not None else UNKNOWN_NETWORK_SHORTCUT
 
 
 def by_chain_id(chain_id: int) -> "NetworkInfo" | None:
diff --git a/core/src/apps/ethereum/networks.py.mako b/core/src/apps/ethereum/networks.py.mako
index 07e1351208..f2ed36682c 100644
--- a/core/src/apps/ethereum/networks.py.mako
+++ b/core/src/apps/ethereum/networks.py.mako
@@ -22,11 +22,12 @@ if TYPE_CHECKING:
         bool  # rskip60
     ]
     # fmt: on
+UNKNOWN_NETWORK_SHORTCUT = "UNKN"
 
 
 def shortcut_by_chain_id(chain_id: int) -> str:
     n = by_chain_id(chain_id)
-    return n.shortcut if n is not None else "UNKN"
+    return n.shortcut if n is not None else UNKNOWN_NETWORK_SHORTCUT
 
 
 def by_chain_id(chain_id: int) -> "NetworkInfo" | None:
diff --git a/core/src/apps/ethereum/sign_message.py b/core/src/apps/ethereum/sign_message.py
index 808cc98923..a14d39d6a6 100644
--- a/core/src/apps/ethereum/sign_message.py
+++ b/core/src/apps/ethereum/sign_message.py
@@ -1,6 +1,6 @@
 from typing import TYPE_CHECKING
 
-from .keychain import PATTERNS_ADDRESS, with_keychain_from_path
+from .keychain import PATTERNS_ADDRESS, with_keychain_from_path_and_defs
 
 if TYPE_CHECKING:
     from trezor.messages import EthereumSignMessage, EthereumMessageSignature
@@ -8,6 +8,8 @@ if TYPE_CHECKING:
 
     from apps.common.keychain import Keychain
 
+    from . import definitions
+
 
 def message_digest(message: bytes) -> bytes:
     from trezor.crypto.hashlib import sha3_256
@@ -21,9 +23,9 @@ def message_digest(message: bytes) -> bytes:
     return h.get_digest()
 
 
-@with_keychain_from_path(*PATTERNS_ADDRESS)
+@with_keychain_from_path_and_defs(*PATTERNS_ADDRESS)
 async def sign_message(
-    ctx: Context, msg: EthereumSignMessage, keychain: Keychain
+    ctx: Context, msg: EthereumSignMessage, keychain: Keychain, defs: definitions.EthereumDefinitions
 ) -> EthereumMessageSignature:
     from trezor.crypto.curve import secp256k1
     from trezor.messages import EthereumMessageSignature
@@ -37,7 +39,7 @@ async def sign_message(
     await paths.validate_path(ctx, keychain, msg.address_n)
 
     node = keychain.derive(msg.address_n)
-    address = address_from_bytes(node.ethereum_pubkeyhash())
+    address = address_from_bytes(node.ethereum_pubkeyhash(), defs.network)
     await confirm_signverify(
         ctx, "ETH", decode_message(msg.message), address, verify=False
     )
diff --git a/core/src/apps/ethereum/sign_tx.py b/core/src/apps/ethereum/sign_tx.py
index a6ccc68974..c75284bed1 100644
--- a/core/src/apps/ethereum/sign_tx.py
+++ b/core/src/apps/ethereum/sign_tx.py
@@ -5,15 +5,16 @@ from trezor.messages import EthereumTxRequest
 from trezor.wire import DataError
 
 from .helpers import bytes_from_address
-from .keychain import with_keychain_from_chain_id
+from .keychain import with_keychain_from_chain_id_and_defs
 
 if TYPE_CHECKING:
+    from collections import defaultdict
     from apps.common.keychain import Keychain
     from trezor.messages import EthereumSignTx, EthereumTxAck
     from trezor.wire import Context
 
     from .keychain import EthereumSignTxAny
-    from . import tokens
+    from . import tokens, definitions
 
 
 # Maximum chain_id which returns the full signature_v (which must fit into an uint32).
@@ -22,9 +23,9 @@ if TYPE_CHECKING:
 MAX_CHAIN_ID = (0xFFFF_FFFF - 36) // 2
 
 
-@with_keychain_from_chain_id
+@with_keychain_from_chain_id_and_defs
 async def sign_tx(
-    ctx: Context, msg: EthereumSignTx, keychain: Keychain
+    ctx: Context, msg: EthereumSignTx, keychain: Keychain, defs: definitions.EthereumDefinitions
 ) -> EthereumTxRequest:
     from trezor.utils import HashWriter
     from trezor.crypto.hashlib import sha3_256
@@ -45,11 +46,11 @@ async def sign_tx(
     await paths.validate_path(ctx, keychain, msg.address_n)
 
     # Handle ERC20s
-    token, address_bytes, recipient, value = await handle_erc20(ctx, msg)
+    token, address_bytes, recipient, value = await handle_erc20(ctx, msg, defs.token_dict)
 
     data_total = msg.data_length
 
-    await require_confirm_tx(ctx, recipient, value, msg.chain_id, token)
+    await require_confirm_tx(ctx, recipient, value, defs.network, token)
     if token is None and msg.data_length > 0:
         await require_confirm_data(ctx, msg.data_initial_chunk, data_total)
 
@@ -58,7 +59,7 @@ async def sign_tx(
         value,
         int.from_bytes(msg.gas_price, "big"),
         int.from_bytes(msg.gas_limit, "big"),
-        msg.chain_id,
+        defs.network,
         token,
     )
 
@@ -100,7 +101,7 @@ async def sign_tx(
 
 
 async def handle_erc20(
-    ctx: Context, msg: EthereumSignTxAny
+    ctx: Context, msg: EthereumSignTxAny, token_dict: defaultdict[bytes, tokens.TokenInfo]
 ) -> tuple[tokens.TokenInfo | None, bytes, bytes, int]:
     from .layout import require_confirm_unknown_token
     from . import tokens
@@ -118,7 +119,7 @@ async def handle_erc20(
         and data_initial_chunk[:16]
         == b"\xa9\x05\x9c\xbb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
     ):
-        token = tokens.token_by_chain_address(msg.chain_id, address_bytes)
+        token = token_dict[address_bytes]
         recipient = data_initial_chunk[16:36]
         value = int.from_bytes(data_initial_chunk[36:68], "big")
 
diff --git a/core/src/apps/ethereum/sign_tx_eip1559.py b/core/src/apps/ethereum/sign_tx_eip1559.py
index 098ebc3521..961501b998 100644
--- a/core/src/apps/ethereum/sign_tx_eip1559.py
+++ b/core/src/apps/ethereum/sign_tx_eip1559.py
@@ -4,7 +4,7 @@ from typing import TYPE_CHECKING
 from trezor.crypto import rlp
 
 from .helpers import bytes_from_address
-from .keychain import with_keychain_from_chain_id
+from .keychain import with_keychain_from_chain_id_and_defs
 
 if TYPE_CHECKING:
     from trezor.messages import (
@@ -13,6 +13,7 @@ if TYPE_CHECKING:
         EthereumTxRequest,
     )
 
+    from . import definitions
     from apps.common.keychain import Keychain
     from trezor.wire import Context
 
@@ -28,9 +29,9 @@ def access_list_item_length(item: EthereumAccessList) -> int:
     )
 
 
-@with_keychain_from_chain_id
+@with_keychain_from_chain_id_and_defs
 async def sign_tx_eip1559(
-    ctx: Context, msg: EthereumSignTxEIP1559, keychain: Keychain
+    ctx: Context, msg: EthereumSignTxEIP1559, keychain: Keychain, defs: definitions.EthereumDefinitions
 ) -> EthereumTxRequest:
     from trezor.crypto.hashlib import sha3_256
     from trezor.utils import HashWriter
@@ -56,11 +57,11 @@ async def sign_tx_eip1559(
     await paths.validate_path(ctx, keychain, msg.address_n)
 
     # Handle ERC20s
-    token, address_bytes, recipient, value = await handle_erc20(ctx, msg)
+    token, address_bytes, recipient, value = await handle_erc20(ctx, msg, defs.token_dict)
 
     data_total = msg.data_length
 
-    await require_confirm_tx(ctx, recipient, value, msg.chain_id, token)
+    await require_confirm_tx(ctx, recipient, value, defs.network, token)
     if token is None and msg.data_length > 0:
         await require_confirm_data(ctx, msg.data_initial_chunk, data_total)
 
@@ -70,7 +71,7 @@ async def sign_tx_eip1559(
         int.from_bytes(msg.max_priority_fee, "big"),
         int.from_bytes(msg.max_gas_fee, "big"),
         int.from_bytes(gas_limit, "big"),
-        msg.chain_id,
+        defs.network,
         token,
     )
 
diff --git a/core/src/apps/ethereum/sign_typed_data.py b/core/src/apps/ethereum/sign_typed_data.py
index d0426b6130..56478f0d06 100644
--- a/core/src/apps/ethereum/sign_typed_data.py
+++ b/core/src/apps/ethereum/sign_typed_data.py
@@ -5,7 +5,7 @@ from trezor.enums import EthereumDataType
 from trezor.wire import DataError
 
 from .helpers import get_type_name
-from .keychain import PATTERNS_ADDRESS, with_keychain_from_path
+from .keychain import PATTERNS_ADDRESS, with_keychain_from_path_and_defs
 from .layout import should_show_struct
 
 if TYPE_CHECKING:
@@ -20,14 +20,16 @@ if TYPE_CHECKING:
         EthereumTypedDataStructAck,
     )
 
+    from . import definitions
+
 
 # Maximum data size we support
 _MAX_VALUE_BYTE_SIZE = const(1024)
 
 
-@with_keychain_from_path(*PATTERNS_ADDRESS)
+@with_keychain_from_path_and_defs(*PATTERNS_ADDRESS)
 async def sign_typed_data(
-    ctx: Context, msg: EthereumSignTypedData, keychain: Keychain
+    ctx: Context, msg: EthereumSignTypedData, keychain: Keychain, defs: definitions.EthereumDefinitions
 ) -> EthereumTypedDataSignature:
     from trezor.crypto.curve import secp256k1
     from apps.common import paths
@@ -46,7 +48,7 @@ async def sign_typed_data(
     )
 
     return EthereumTypedDataSignature(
-        address=address_from_bytes(node.ethereum_pubkeyhash()),
+        address=address_from_bytes(node.ethereum_pubkeyhash(), defs.network),
         signature=signature[1:] + signature[0:1],
     )
 
diff --git a/core/src/apps/ethereum/tokens.py b/core/src/apps/ethereum/tokens.py
index b0f66afb43..c7ff897ad6 100644
--- a/core/src/apps/ethereum/tokens.py
+++ b/core/src/apps/ethereum/tokens.py
@@ -18,9 +18,19 @@ from typing import Iterator
 
 
 class TokenInfo:
-    def __init__(self, symbol: str, decimals: int) -> None:
+    def __init__(
+        self,
+        symbol: str,
+        decimals: int,
+        address: bytes = None,
+        chain_id: int = None,
+        name: str = None,
+    ) -> None:
         self.symbol = symbol
         self.decimals = decimals
+        self.address = address
+        self.chain_id = chain_id
+        self.name = name
 
 
 UNKNOWN_TOKEN = TokenInfo("Wei UNKN", 0)
diff --git a/core/src/apps/ethereum/tokens.py.mako b/core/src/apps/ethereum/tokens.py.mako
index bf1455deba..a94b573f24 100644
--- a/core/src/apps/ethereum/tokens.py.mako
+++ b/core/src/apps/ethereum/tokens.py.mako
@@ -27,9 +27,19 @@ def group_tokens(tokens):
 %>\
 
 class TokenInfo:
-    def __init__(self, symbol: str, decimals: int) -> None:
+    def __init__(
+        self,
+        symbol: str,
+        decimals: int,
+        address: bytes = None,
+        chain_id: int = None,
+        name: str = None,
+    ) -> None:
         self.symbol = symbol
         self.decimals = decimals
+        self.address = address
+        self.chain_id = chain_id
+        self.name = name
 
 
 UNKNOWN_TOKEN = TokenInfo("Wei UNKN", 0)
diff --git a/core/src/apps/ethereum/verify_message.py b/core/src/apps/ethereum/verify_message.py
index cc6bd552d1..7fc9158078 100644
--- a/core/src/apps/ethereum/verify_message.py
+++ b/core/src/apps/ethereum/verify_message.py
@@ -14,9 +14,12 @@ async def verify_message(ctx: Context, msg: EthereumVerifyMessage) -> Success:
 
     from apps.common.signverify import decode_message
 
+    from . import definitions
     from .helpers import address_from_bytes, bytes_from_address
     from .sign_message import message_digest
 
+    defs = definitions.get_definitions_from_msg(msg)
+
     digest = message_digest(msg.message)
     if len(msg.signature) != 65:
         raise DataError("Invalid signature")
@@ -33,7 +36,7 @@ async def verify_message(ctx: Context, msg: EthereumVerifyMessage) -> Success:
     if address_bytes != pkh:
         raise DataError("Invalid signature")
 
-    address = address_from_bytes(address_bytes)
+    address = address_from_bytes(address_bytes, defs.network)
 
     await confirm_signverify(
         ctx, "ETH", decode_message(msg.message), address, verify=True