diff --git a/README.md b/README.md
index f7a5df4b..40639994 100644
--- a/README.md
+++ b/README.md
@@ -118,9 +118,10 @@ You can use `new-mnemonic --help` to see all arguments. Note that if there are m
 | Argument | Type | Description |
 | -------- | -------- | -------- |
 | `--num_validators`  | Non-negative integer | The number of signing keys you want to generate. Note that the child key(s) are generated via the same master key. |
-| `--mnemonic_language` | String. Options: `czech`, `chinese_traditional`, `chinese_simplified`, `english`, `spanish`, `italian`, `korean`. Default to `english` | The mnemonic language |
+| `--mnemonic_language` | String. Options: `chinese_simplified`, `chinese_traditional`, `czech`, `english`, `italian`, `korean`, `portuguese`, `spanish`. Default to `english` | The mnemonic language |
 | `--folder` | String. Pointing to `./validator_keys` by default | The folder path for the keystore(s) and deposit(s) |
 | `--chain` | String. `mainnet` by default | The chain setting for the signing domain. |
+| `--eth1_withdrawal_address` | String. Eth1 address in hexadecimal encoded form | If this field is set and valid, the given Eth1 address will be used to create the withdrawal credentials. Otherwise, it will generate withdrawal credentials with the mnemonic-derived withdrawal public key in [EIP-2334 format](https://eips.ethereum.org/EIPS/eip-2334#eth2-specific-parameters). |
 
 ###### `existing-mnemonic` Arguments
 
@@ -132,6 +133,7 @@ You can use `existing-mnemonic --help` to see all arguments. Note that if there
 | `--num_validators`  | Non-negative integer | The number of signing keys you want to generate. Note that the child key(s) are generated via the same master key. |
 | `--folder` | String. Pointing to `./validator_keys` by default | The folder path for the keystore(s) and deposit(s) |
 | `--chain` | String. `mainnet` by default | The chain setting for the signing domain. |
+| `--eth1_withdrawal_address` | String. Eth1 address in hexadecimal encoded form | If this field is set and valid, the given Eth1 address will be used to create the withdrawal credentials. Otherwise, it will generate withdrawal credentials with the mnemonic-derived withdrawal public key in [EIP-2334 format](https://eips.ethereum.org/EIPS/eip-2334#eth2-specific-parameters). |
 
 ###### Successful message
 
diff --git a/eth2deposit/cli/generate_keys.py b/eth2deposit/cli/generate_keys.py
index 8b85b3e1..4c12c3d9 100644
--- a/eth2deposit/cli/generate_keys.py
+++ b/eth2deposit/cli/generate_keys.py
@@ -5,6 +5,9 @@
     Callable,
 )
 
+from eth_typing import HexAddress
+from eth_utils import is_hex_address, to_normalized_address
+
 from eth2deposit.credentials import (
     CredentialList,
 )
@@ -57,6 +60,18 @@ def validate_password(cts: click.Context, param: Any, password: str) -> str:
     return password
 
 
+def validate_eth1_withdrawal_address(cts: click.Context, param: Any, address: str) -> HexAddress:
+    if address is None:
+        return None
+    if not is_hex_address(address):
+        raise ValueError("The given Eth1 address is not in hexadecimal encoded form.")
+
+    normalized_address = to_normalized_address(address)
+    click.echo(f'\n**[Warning] you are setting Eth1 address {normalized_address} as your withdrawal address. '
+               'Please ensure that you have control over this address.**\n')
+    return normalized_address
+
+
 def generate_keys_arguments_decorator(function: Callable[..., Any]) -> Callable[..., Any]:
     '''
     This is a decorator that, when applied to a parent-command, implements the
@@ -91,6 +106,14 @@ def generate_keys_arguments_decorator(function: Callable[..., Any]) -> Callable[
                   'to ask you for your mnemonic as otherwise it will appear in your shell history.)'),
             prompt='Type the password that secures your validator keystore(s)',
         ),
+        click.option(
+            '--eth1_withdrawal_address',
+            default=None,
+            callback=validate_eth1_withdrawal_address,
+            help=('If this field is set and valid, the given Eth1 address will be used to create the '
+                  'withdrawal credentials. Otherwise, it will generate withdrawal credentials with the '
+                  'mnemonic-derived withdrawal public key.'),
+        ),
     ]
     for decorator in reversed(decorators):
         function = decorator(function)
@@ -100,7 +123,8 @@ def generate_keys_arguments_decorator(function: Callable[..., Any]) -> Callable[
 @click.command()
 @click.pass_context
 def generate_keys(ctx: click.Context, validator_start_index: int,
-                  num_validators: int, folder: str, chain: str, keystore_password: str, **kwargs: Any) -> None:
+                  num_validators: int, folder: str, chain: str, keystore_password: str,
+                  eth1_withdrawal_address: HexAddress, **kwargs: Any) -> None:
     mnemonic = ctx.obj['mnemonic']
     mnemonic_password = ctx.obj['mnemonic_password']
     amounts = [MAX_DEPOSIT_AMOUNT] * num_validators
@@ -118,12 +142,13 @@ def generate_keys(ctx: click.Context, validator_start_index: int,
         amounts=amounts,
         chain_setting=chain_setting,
         start_index=validator_start_index,
+        hex_eth1_withdrawal_address=eth1_withdrawal_address,
     )
     keystore_filefolders = credentials.export_keystores(password=keystore_password, folder=folder)
     deposits_file = credentials.export_deposit_data_json(folder=folder)
     if not credentials.verify_keystores(keystore_filefolders=keystore_filefolders, password=keystore_password):
         raise ValidationError("Failed to verify the keystores.")
-    if not verify_deposit_data_json(deposits_file):
+    if not verify_deposit_data_json(deposits_file, credentials.credentials):
         raise ValidationError("Failed to verify the deposit data JSON files.")
     click.echo('\nSuccess!\nYour keys can be found at: %s' % folder)
     click.pause('\n\nPress any key.')
diff --git a/eth2deposit/credentials.py b/eth2deposit/credentials.py
index a7d864af..c76b26d0 100644
--- a/eth2deposit/credentials.py
+++ b/eth2deposit/credentials.py
@@ -1,8 +1,12 @@
 import os
 import click
+from enum import Enum
 import time
 import json
-from typing import Dict, List
+from typing import Dict, List, Optional
+
+from eth_typing import Address, HexAddress
+from eth_utils import to_canonical_address
 from py_ecc.bls import G2ProofOfPossession as bls
 
 from eth2deposit.exceptions import ValidationError
@@ -14,6 +18,7 @@
 from eth2deposit.settings import DEPOSIT_CLI_VERSION, BaseChainSetting
 from eth2deposit.utils.constants import (
     BLS_WITHDRAWAL_PREFIX,
+    ETH1_ADDRESS_WITHDRAWAL_PREFIX,
     ETH2GWEI,
     MAX_DEPOSIT_AMOUNT,
     MIN_DEPOSIT_AMOUNT,
@@ -27,13 +32,19 @@
 )
 
 
+class WithdrawalType(Enum):
+    BLS_WITHDRAWAL = 0
+    ETH1_ADDRESS_WITHDRAWAL = 1
+
+
 class Credential:
     """
     A Credential object contains all of the information for a single validator and the corresponding functionality.
     Once created, it is the only object that should be required to perform any processing for a validator.
     """
     def __init__(self, *, mnemonic: str, mnemonic_password: str,
-                 index: int, amount: int, chain_setting: BaseChainSetting):
+                 index: int, amount: int, chain_setting: BaseChainSetting,
+                 hex_eth1_withdrawal_address: Optional[HexAddress]):
         # Set path as EIP-2334 format
         # https://eips.ethereum.org/EIPS/eip-2334
         purpose = '12381'
@@ -48,6 +59,7 @@ def __init__(self, *, mnemonic: str, mnemonic_password: str,
             mnemonic=mnemonic, path=self.signing_key_path, password=mnemonic_password)
         self.amount = amount
         self.chain_setting = chain_setting
+        self.hex_eth1_withdrawal_address = hex_eth1_withdrawal_address
 
     @property
     def signing_pk(self) -> bytes:
@@ -57,10 +69,42 @@ def signing_pk(self) -> bytes:
     def withdrawal_pk(self) -> bytes:
         return bls.SkToPk(self.withdrawal_sk)
 
+    @property
+    def eth1_withdrawal_address(self) -> Optional[Address]:
+        if self.hex_eth1_withdrawal_address is None:
+            return None
+        return to_canonical_address(self.hex_eth1_withdrawal_address)
+
+    @property
+    def withdrawal_prefix(self) -> bytes:
+        if self.eth1_withdrawal_address is not None:
+            return ETH1_ADDRESS_WITHDRAWAL_PREFIX
+        else:
+            return BLS_WITHDRAWAL_PREFIX
+
+    @property
+    def withdrawal_type(self) -> WithdrawalType:
+        if self.withdrawal_prefix == BLS_WITHDRAWAL_PREFIX:
+            return WithdrawalType.BLS_WITHDRAWAL
+        elif self.withdrawal_prefix == ETH1_ADDRESS_WITHDRAWAL_PREFIX:
+            return WithdrawalType.ETH1_ADDRESS_WITHDRAWAL
+        else:
+            raise ValueError(f"Invalid withdrawal_prefix {self.withdrawal_prefix.hex()}")
+
     @property
     def withdrawal_credentials(self) -> bytes:
-        withdrawal_credentials = BLS_WITHDRAWAL_PREFIX
-        withdrawal_credentials += SHA256(self.withdrawal_pk)[1:]
+        if self.withdrawal_type == WithdrawalType.BLS_WITHDRAWAL:
+            withdrawal_credentials = BLS_WITHDRAWAL_PREFIX
+            withdrawal_credentials += SHA256(self.withdrawal_pk)[1:]
+        elif (
+            self.withdrawal_type == WithdrawalType.ETH1_ADDRESS_WITHDRAWAL
+            and self.eth1_withdrawal_address is not None
+        ):
+            withdrawal_credentials = ETH1_ADDRESS_WITHDRAWAL_PREFIX
+            withdrawal_credentials += b'\x00' * 11
+            withdrawal_credentials += self.eth1_withdrawal_address
+        else:
+            raise ValueError(f"Invalid withdrawal_type {self.withdrawal_type}")
         return withdrawal_credentials
 
     @property
@@ -129,7 +173,8 @@ def from_mnemonic(cls,
                       num_keys: int,
                       amounts: List[int],
                       chain_setting: BaseChainSetting,
-                      start_index: int) -> 'CredentialList':
+                      start_index: int,
+                      hex_eth1_withdrawal_address: Optional[HexAddress]) -> 'CredentialList':
         if len(amounts) != num_keys:
             raise ValueError(
                 f"The number of keys ({num_keys}) doesn't equal to the corresponding deposit amounts ({len(amounts)})."
@@ -138,7 +183,8 @@ def from_mnemonic(cls,
         with click.progressbar(key_indices, label='Creating your keys:\t\t',
                                show_percent=False, show_pos=True) as indices:
             return cls([Credential(mnemonic=mnemonic, mnemonic_password=mnemonic_password,
-                                   index=index, amount=amounts[index - start_index], chain_setting=chain_setting)
+                                   index=index, amount=amounts[index - start_index], chain_setting=chain_setting,
+                                   hex_eth1_withdrawal_address=hex_eth1_withdrawal_address)
                         for index in indices])
 
     def export_keystores(self, password: str, folder: str) -> List[str]:
diff --git a/eth2deposit/key_handling/key_derivation/word_lists/portuguese.txt b/eth2deposit/key_handling/key_derivation/word_lists/portuguese.txt
new file mode 100644
index 00000000..4a891055
--- /dev/null
+++ b/eth2deposit/key_handling/key_derivation/word_lists/portuguese.txt
@@ -0,0 +1,2048 @@
+abacate
+abaixo
+abalar
+abater
+abduzir
+abelha
+aberto
+abismo
+abotoar
+abranger
+abreviar
+abrigar
+abrupto
+absinto
+absoluto
+absurdo
+abutre
+acabado
+acalmar
+acampar
+acanhar
+acaso
+aceitar
+acelerar
+acenar
+acervo
+acessar
+acetona
+achatar
+acidez
+acima
+acionado
+acirrar
+aclamar
+aclive
+acolhida
+acomodar
+acoplar
+acordar
+acumular
+acusador
+adaptar
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+adjunto
+admirar
+adorar
+adquirir
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+adverso
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+aeronave
+afastar
+aferir
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+agreste
+agrupar
+aguardar
+agulha
+ajoelhar
+ajudar
+ajustar
+alameda
+alarme
+alastrar
+alavanca
+albergue
+albino
+alcatra
+aldeia
+alecrim
+alegria
+alertar
+alface
+alfinete
+algum
+alheio
+aliar
+alicate
+alienar
+alinhar
+aliviar
+almofada
+alocar
+alpiste
+alterar
+altitude
+alucinar
+alugar
+aluno
+alusivo
+alvo
+amaciar
+amador
+amarelo
+amassar
+ambas
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+ameixa
+amenizar
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+amizade
+amolador
+amontoar
+amoroso
+amostra
+amparar
+ampliar
+ampola
+anagrama
+analisar
+anarquia
+anatomia
+andaime
+anel
+anexo
+angular
+animar
+anjo
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+anotado
+ansioso
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+anuidade
+anunciar
+anzol
+apagador
+apalpar
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+apelido
+apertada
+apesar
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+aplauso
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+aprendiz
+aprovar
+aquecer
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+arraial
+arrebate
+arriscar
+arroba
+arrumar
+arsenal
+arterial
+artigo
+arvoredo
+asfaltar
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+aspirar
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+assoalho
+assunto
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+atarefar
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+atoleiro
+atracar
+atrevido
+atriz
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+atum
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+aumentar
+aura
+aurora
+autismo
+autoria
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+avaliar
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+avental
+avesso
+aviador
+avisar
+avulso
+axila
+azarar
+azedo
+azeite
+azulejo
+babar
+babosa
+bacalhau
+bacharel
+bacia
+bagagem
+baiano
+bailar
+baioneta
+bairro
+baixista
+bajular
+baleia
+baliza
+balsa
+banal
+bandeira
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+etanol
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+euforia
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+evacuar
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+evidente
+evoluir
+exagero
+exalar
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+excesso
+excitar
+exclamar
+executar
+exemplo
+exibir
+exigente
+exonerar
+expandir
+expelir
+expirar
+explanar
+exposto
+expresso
+expulsar
+externo
+extinto
+extrato
+fabricar
+fabuloso
+faceta
+facial
+fada
+fadiga
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diff --git a/eth2deposit/settings.py b/eth2deposit/settings.py
index 8558afe4..d1c185ae 100644
--- a/eth2deposit/settings.py
+++ b/eth2deposit/settings.py
@@ -1,7 +1,7 @@
 from typing import Dict, NamedTuple
 
 
-DEPOSIT_CLI_VERSION = '1.1.1'
+DEPOSIT_CLI_VERSION = '1.2.0'
 
 
 class BaseChainSetting(NamedTuple):
diff --git a/eth2deposit/utils/constants.py b/eth2deposit/utils/constants.py
index a0f40a5d..13d1d629 100644
--- a/eth2deposit/utils/constants.py
+++ b/eth2deposit/utils/constants.py
@@ -6,6 +6,7 @@
 # Eth2-spec constants taken from https://github.com/ethereum/eth2.0-specs/blob/dev/specs/phase0/beacon-chain.md
 DOMAIN_DEPOSIT = bytes.fromhex('03000000')
 BLS_WITHDRAWAL_PREFIX = bytes.fromhex('00')
+ETH1_ADDRESS_WITHDRAWAL_PREFIX = bytes.fromhex('01')
 
 ETH2GWEI = 10 ** 9
 MIN_DEPOSIT_AMOUNT = 2 ** 0 * ETH2GWEI
diff --git a/eth2deposit/utils/validation.py b/eth2deposit/utils/validation.py
index 96b8d5ca..23a513d8 100644
--- a/eth2deposit/utils/validation.py
+++ b/eth2deposit/utils/validation.py
@@ -4,7 +4,7 @@
     BLSPubkey,
     BLSSignature,
 )
-from typing import Any, Dict
+from typing import Any, Dict, Sequence
 
 from py_ecc.bls import G2ProofOfPossession as bls
 
@@ -15,13 +15,19 @@
     DepositData,
     DepositMessage,
 )
+from eth2deposit.credentials import (
+    Credential,
+)
 from eth2deposit.utils.constants import (
     MAX_DEPOSIT_AMOUNT,
     MIN_DEPOSIT_AMOUNT,
+    BLS_WITHDRAWAL_PREFIX,
+    ETH1_ADDRESS_WITHDRAWAL_PREFIX,
 )
+from eth2deposit.utils.crypto import SHA256
 
 
-def verify_deposit_data_json(filefolder: str) -> bool:
+def verify_deposit_data_json(filefolder: str, credentials: Sequence[Credential]) -> bool:
     """
     Validate every deposit found in the deposit-data JSON file folder.
     """
@@ -29,11 +35,11 @@ def verify_deposit_data_json(filefolder: str) -> bool:
         deposit_json = json.load(f)
         with click.progressbar(deposit_json, label='Verifying your deposits:\t',
                                show_percent=False, show_pos=True) as deposits:
-            return all([validate_deposit(deposit) for deposit in deposits])
+            return all([validate_deposit(deposit, credential) for deposit, credential in zip(deposits, credentials)])
     return False
 
 
-def validate_deposit(deposit_data_dict: Dict[str, Any]) -> bool:
+def validate_deposit(deposit_data_dict: Dict[str, Any], credential: Credential) -> bool:
     '''
     Checks whether a deposit is valid based on the eth2 rules.
     https://github.com/ethereum/eth2.0-specs/blob/dev/specs/phase0/beacon-chain.md#deposits
@@ -45,6 +51,28 @@ def validate_deposit(deposit_data_dict: Dict[str, Any]) -> bool:
     deposit_message_root = bytes.fromhex(deposit_data_dict['deposit_data_root'])
     fork_version = bytes.fromhex(deposit_data_dict['fork_version'])
 
+    # Verify pubkey
+    if len(pubkey) != 48:
+        return False
+    if pubkey != credential.signing_pk:
+        return False
+
+    # Verify withdrawal credential
+    if len(withdrawal_credentials) != 32:
+        return False
+    if withdrawal_credentials[:1] == BLS_WITHDRAWAL_PREFIX == credential.withdrawal_prefix:
+        if withdrawal_credentials[1:] != SHA256(credential.withdrawal_pk)[1:]:
+            return False
+    elif withdrawal_credentials[:1] == ETH1_ADDRESS_WITHDRAWAL_PREFIX == credential.withdrawal_prefix:
+        if withdrawal_credentials[1:12] != b'\x00' * 11:
+            return False
+        if credential.eth1_withdrawal_address is None:
+            return False
+        if withdrawal_credentials[12:] != credential.eth1_withdrawal_address:
+            return False
+    else:
+        return False
+
     # Verify deposit amount
     if not MIN_DEPOSIT_AMOUNT < amount <= MAX_DEPOSIT_AMOUNT:
         return False
diff --git a/requirements.txt b/requirements.txt
index b47f495a..52bb25b6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,8 @@ pycryptodome==3.9.8 \
     --hash=sha256:f2e045224074d5664dc9cbabbf4f4d4d46f1ee90f24780e3a9a668fd096ff17f \
     --hash=sha256:f521178e5a991ffd04182ed08f552daca1affcb826aeda0e1945cd989a9d4345 \
     --hash=sha256:f78a68c2c820e4731e510a2df3eef0322f24fde1781ced970bf497b6c7d92982 \
-    --hash=sha256:fbe65d5cfe04ff2f7684160d50f5118bdefb01e3af4718eeb618bfed40f19d94
+    --hash=sha256:fbe65d5cfe04ff2f7684160d50f5118bdefb01e3af4718eeb618bfed40f19d94 \
+    --hash=sha256:be7553b8bea117892f83f52ebfe96929340cacae07f3f6a820291e42168dff62
 click==7.1.2 \
     --hash=sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a \
     --hash=sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc
@@ -55,17 +56,20 @@ mypy-extensions==0.4.3 \
     --hash=sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d \
     --hash=sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8
 lru-dict==1.1.6 \
-    --hash=sha256:365457660e3d05b76f1aba3e0f7fedbfcd6528e97c5115a351ddd0db488354cc
+    --hash=sha256:365457660e3d05b76f1aba3e0f7fedbfcd6528e97c5115a351ddd0db488354cc \
+    --hash=sha256:288d8794e9376fe31d27abc3531d395675b2a910781f26034d5ef79f0ba9cecc
 pyrsistent==0.16.1 \
     --hash=sha256:aa2ae1c2e496f4d6777f869ea5de7166a8ccb9c2e06ebcf6c7ff1b670c98c5ef
 eth-hash==0.2.0 \
     --hash=sha256:1b9cb34dd3cd99c85c2bd6a1420ceae39a2eee8bf080efd264bcda8be3edecc8 \
     --hash=sha256:499dc02d098f69856d1a6dd005529c16174157d4fb2a9fe20c41f69e39f8f176
 cytoolz==0.10.1 \
-    --hash=sha256:82f5bba81d73a5a6b06f2a3553ff9003d865952fcb32e1df192378dd944d8a5c
+    --hash=sha256:82f5bba81d73a5a6b06f2a3553ff9003d865952fcb32e1df192378dd944d8a5c \
+    --hash=sha256:5161bef77f7b69bea64b4e052d0da17845e6adae6d09f91cc7e5acfc5cb2c5c4
 toolz==0.10.0 \
     --hash=sha256:08fdd5ef7c96480ad11c12d472de21acd32359996f69a5259299b540feba4560 \
-    --hash=sha256:e71d8d91c8902fb7659c23e10e9698a8c5cbea985683b8a378c6fd67b52f2fc4
+    --hash=sha256:e71d8d91c8902fb7659c23e10e9698a8c5cbea985683b8a378c6fd67b52f2fc4 \
+    --hash=sha256:c43f7cffb32a3c8e3fb51192cae4dcdbf0a6fee4d07142ca2e443d2bd9f89400
 six==1.15.0 \
     --hash=sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259 \
     --hash=sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced
diff --git a/requirements_test.txt b/requirements_test.txt
index e4899000..7e042617 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -78,7 +78,8 @@ typed-ast==1.4.1 \
     --hash=sha256:d43943ef777f9a1c42bf4e552ba23ac77a6351de620aa9acf64ad54933ad4d34 \
     --hash=sha256:d5d33e9e7af3b34a40dc05f498939f0ebf187f07c385fd58d591c533ad8562fe \
     --hash=sha256:fc0fea399acb12edbf8a628ba8d2312f583bdbdb3335635db062fa98cf71fca4 \
-    --hash=sha256:fe460b922ec15dd205595c9b5b99e2f056fd98ae8f9f56b888e7a17dc2b757e7
+    --hash=sha256:fe460b922ec15dd205595c9b5b99e2f056fd98ae8f9f56b888e7a17dc2b757e7 \
+    --hash=sha256:3791f73e5d75aa9a95274679ab4821bd9d16de623c4ecf4900a77a29864ee144
 packaging==20.4 \
     --hash=sha256:4357f74f47b9c12db93624a82154e9b120fa8293699949152b22065d556079f8 \
     --hash=sha256:998416ba6962ae7fbd6596850b80e17859a5753ba17c32284f67bfff33784181
diff --git a/setup.py b/setup.py
index e148d351..9976c689 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@
 
 setup(
     name="eth2deposit",
-    version='1.1.1',
+    version='1.2.0',
     py_modules=["eth2deposit"],
     packages=find_packages(exclude=('tests', 'docs')),
     python_requires=">=3.7,<4",
diff --git a/tests/test_cli/test_existing_menmonic.py b/tests/test_cli/test_existing_menmonic.py
index 5c3623d1..2ecc97c2 100644
--- a/tests/test_cli/test_existing_menmonic.py
+++ b/tests/test_cli/test_existing_menmonic.py
@@ -1,16 +1,18 @@
 import asyncio
+import json
 import os
 
 import pytest
-
 from click.testing import CliRunner
 
+from eth_utils import decode_hex
+
 from eth2deposit.deposit import cli
-from eth2deposit.utils.constants import DEFAULT_VALIDATOR_KEYS_FOLDER_NAME
+from eth2deposit.utils.constants import DEFAULT_VALIDATOR_KEYS_FOLDER_NAME, ETH1_ADDRESS_WITHDRAWAL_PREFIX
 from.helpers import clean_key_folder, get_permissions, get_uuid
 
 
-def test_existing_mnemonic() -> None:
+def test_existing_mnemonic_bls_withdrawal() -> None:
     # Prepare folder
     my_folder_path = os.path.join(os.getcwd(), 'TESTING_TEMP_FOLDER')
     clean_key_folder(my_folder_path)
@@ -46,6 +48,57 @@ def test_existing_mnemonic() -> None:
     clean_key_folder(my_folder_path)
 
 
+def test_existing_mnemonic_eth1_address_withdrawal() -> None:
+    # Prepare folder
+    my_folder_path = os.path.join(os.getcwd(), 'TESTING_TEMP_FOLDER')
+    clean_key_folder(my_folder_path)
+    if not os.path.exists(my_folder_path):
+        os.mkdir(my_folder_path)
+
+    runner = CliRunner()
+    inputs = [
+        'abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about',
+        '2', '2', '5', 'mainnet', 'MyPassword', 'MyPassword', 'yes']
+    data = '\n'.join(inputs)
+    eth1_withdrawal_address = '0x00000000219ab540356cbb839cbe05303d7705fa'
+    arguments = [
+        'existing-mnemonic',
+        '--folder', my_folder_path,
+        '--mnemonic-password', 'TREZOR',
+        '--eth1_withdrawal_address', eth1_withdrawal_address,
+    ]
+    result = runner.invoke(cli, arguments, input=data)
+
+    assert result.exit_code == 0
+
+    # Check files
+    validator_keys_folder_path = os.path.join(my_folder_path, DEFAULT_VALIDATOR_KEYS_FOLDER_NAME)
+    _, _, key_files = next(os.walk(validator_keys_folder_path))
+
+    deposit_file = [key_file for key_file in key_files if key_file.startswith('deposit_data')][0]
+    with open(validator_keys_folder_path + '/' + deposit_file, 'r') as f:
+        deposits_dict = json.load(f)
+    for deposit in deposits_dict:
+        withdrawal_credentials = bytes.fromhex(deposit['withdrawal_credentials'])
+        assert withdrawal_credentials == (
+            ETH1_ADDRESS_WITHDRAWAL_PREFIX + b'\x00' * 11 + decode_hex(eth1_withdrawal_address)
+        )
+
+    all_uuid = [
+        get_uuid(validator_keys_folder_path + '/' + key_file)
+        for key_file in key_files
+        if key_file.startswith('keystore')
+    ]
+    assert len(set(all_uuid)) == 5
+
+    # Verify file permissions
+    if os.name == 'posix':
+        for file_name in key_files:
+            assert get_permissions(validator_keys_folder_path, file_name) == '0o440'
+    # Clean up
+    clean_key_folder(my_folder_path)
+
+
 @pytest.mark.asyncio
 async def test_script() -> None:
     my_folder_path = os.path.join(os.getcwd(), 'TESTING_TEMP_FOLDER')
diff --git a/tests/test_cli/test_new_mnemonic.py b/tests/test_cli/test_new_mnemonic.py
index d588db28..4ff1d644 100644
--- a/tests/test_cli/test_new_mnemonic.py
+++ b/tests/test_cli/test_new_mnemonic.py
@@ -1,16 +1,19 @@
 import asyncio
+import json
 import os
 
 import pytest
-
 from click.testing import CliRunner
+
+from eth_utils import decode_hex
+
 from eth2deposit.cli import new_mnemonic
 from eth2deposit.deposit import cli
-from eth2deposit.utils.constants import DEFAULT_VALIDATOR_KEYS_FOLDER_NAME
+from eth2deposit.utils.constants import DEFAULT_VALIDATOR_KEYS_FOLDER_NAME, ETH1_ADDRESS_WITHDRAWAL_PREFIX
 from .helpers import clean_key_folder, get_permissions, get_uuid
 
 
-def test_new_mnemonic(monkeypatch) -> None:
+def test_new_mnemonic_bls_withdrawal(monkeypatch) -> None:
     # monkeypatch get_mnemonic
     def mock_get_mnemonic(language, words_path, entropy=None) -> str:
         return "fakephrase"
@@ -49,6 +52,60 @@ def mock_get_mnemonic(language, words_path, entropy=None) -> str:
     clean_key_folder(my_folder_path)
 
 
+def test_new_mnemonic_eth1_address_withdrawal(monkeypatch) -> None:
+    # monkeypatch get_mnemonic
+    def mock_get_mnemonic(language, words_path, entropy=None) -> str:
+        return "fakephrase"
+
+    monkeypatch.setattr(new_mnemonic, "get_mnemonic", mock_get_mnemonic)
+
+    # Prepare folder
+    my_folder_path = os.path.join(os.getcwd(), 'TESTING_TEMP_FOLDER')
+    clean_key_folder(my_folder_path)
+    if not os.path.exists(my_folder_path):
+        os.mkdir(my_folder_path)
+
+    runner = CliRunner()
+    inputs = ['english', '1', 'mainnet', 'MyPassword', 'MyPassword', 'fakephrase']
+    data = '\n'.join(inputs)
+    eth1_withdrawal_address = '0x00000000219ab540356cbb839cbe05303d7705fa'
+    arguments = [
+        'new-mnemonic',
+        '--folder', my_folder_path,
+        '--eth1_withdrawal_address', eth1_withdrawal_address,
+    ]
+    result = runner.invoke(cli, arguments, input=data)
+    assert result.exit_code == 0
+
+    # Check files
+    validator_keys_folder_path = os.path.join(my_folder_path, DEFAULT_VALIDATOR_KEYS_FOLDER_NAME)
+    _, _, key_files = next(os.walk(validator_keys_folder_path))
+
+    deposit_file = [key_file for key_file in key_files if key_file.startswith('deposit_data')][0]
+    with open(validator_keys_folder_path + '/' + deposit_file, 'r') as f:
+        deposits_dict = json.load(f)
+    for deposit in deposits_dict:
+        withdrawal_credentials = bytes.fromhex(deposit['withdrawal_credentials'])
+        assert withdrawal_credentials == (
+            ETH1_ADDRESS_WITHDRAWAL_PREFIX + b'\x00' * 11 + decode_hex(eth1_withdrawal_address)
+        )
+
+    all_uuid = [
+        get_uuid(validator_keys_folder_path + '/' + key_file)
+        for key_file in key_files
+        if key_file.startswith('keystore')
+    ]
+    assert len(set(all_uuid)) == 1
+
+    # Verify file permissions
+    if os.name == 'posix':
+        for file_name in key_files:
+            assert get_permissions(validator_keys_folder_path, file_name) == '0o440'
+
+    # Clean up
+    clean_key_folder(my_folder_path)
+
+
 @pytest.mark.asyncio
 async def test_script() -> None:
     my_folder_path = os.path.join(os.getcwd(), 'TESTING_TEMP_FOLDER')
diff --git a/tests/test_credentials.py b/tests/test_credentials.py
index fa14b6be..53669301 100644
--- a/tests/test_credentials.py
+++ b/tests/test_credentials.py
@@ -13,4 +13,5 @@ def test_from_mnemonic() -> None:
             amounts=[32, 32],
             chain_setting=MainnetSetting,
             start_index=1,
+            hex_eth1_withdrawal_address=None,
         )
diff --git a/tests/test_key_handling/test_key_derivation/test_vectors/mnemonic.json b/tests/test_key_handling/test_key_derivation/test_vectors/mnemonic.json
index 843afd21..11b7a6ea 100644
--- a/tests/test_key_handling/test_key_derivation/test_vectors/mnemonic.json
+++ b/tests/test_key_handling/test_key_derivation/test_vectors/mnemonic.json
@@ -729,6 +729,152 @@
             "xprv9s21ZrQH143K2JNoRzEr4Hk99mxRnwy8tdhjFuDfQ1mxLiu4BQSwTuVdZbPgu6ykRXbR7MWhkH6mQACGV3DVChebP3iFp8RvY56hNAcN6yf"
         ]
     ],
+    "portuguese": [
+        [
+            "00000000000000000000000000000000",
+            "abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abater",
+            "ab9742b024a1e8bd241b76f8b3a157e9d442da60277bc8f36b8b23afe163de79414fb49fd1a8dd26f4ea7f0dc965c760b3b80727557bdca61e1f0b0f069952f2",
+            "xprv9s21ZrQH143K4ayH97er9xirrbGL9hEywmMfh1LdQjwtrsnrvENN7c2yKs82HypXo4GAMt4wpnna9doa1FDFYXQTSFReWDY4XAf4imN5m6s"
+        ],
+        [
+            "7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f",
+            "imitador vinheta sogro xerife veleiro pomar volumoso tratador imitador vinheta sogro xingar",
+            "298d1614ff06ae803709f5be5331135cb74e6cc77fa09e07a3e887c2e370401f9a73a409dadf58b5a5197b27ffb3fa5dd528aad9a1a8750d7669ce950ee60c2c",
+            "xprv9s21ZrQH143K3H4uYufypQuRqf28rLoZpLTwjpeCiPBpcZtJpupYd2oS39oGnrHd7fPAgU5d8bfTpYd97MShp4f9fBGj5K1F9NqgZFpmbVj"
+        ],
+        [
+            "80808080808080808080808080808080",
+            "inalador acirrar barulho abotoar afivelar coruja abutre amostra inalador acirrar barulho abduzir",
+            "800fd4e7691fbc3ceed246c211a38949c3607fe269a35829e40ca9d3e26515a4ebd64d8bfe9b66b49543fe9dab78bde7cb7102968ce669f55293bcc02e26ba0e",
+            "xprv9s21ZrQH143K2qEuVaHnXDY1HbcQ9nMyNoi5tgGyFxfYXVxHipQ9hcmS2QitJxsNFatCZk4EYoyyNdWamAjJiMLhuimpjiWHPvJCw28EMSr"
+        ],
+        [
+            "ffffffffffffffffffffffffffffffff",
+            "zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido xeque",
+            "7fb404372815ea28ef97a64249acd71a293ea0437b3dac8f7e193a10f3584e2055753cc8d6f025229f65e61318fc4e10d4017bd3cc3496f535eca3247d26acd6",
+            "xprv9s21ZrQH143K3tfxkHq74PSrq4HqTjs5sHHxBpjoP26GnJ5Q8w7tEn5kmPESuqN5TQb9Lu4LysqMAcXHWNsr3DKSnvuu3vx6sK7V6Hhv2iD"
+        ],
+        [
+            "000000000000000000000000000000000000000000000000",
+            "abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate acumular",
+            "81c66b6789e8b91c169335be4436fd9736ca9c06425acd09b0525e1d6836383130f7f7d31378aaef8b7109503972f40d42f6c6b9f99765827bea762515d3404d",
+            "xprv9s21ZrQH143K4LsdmZ3NinpZHGbQ6n7aQr5uV8Rv7Fq8yNPdAzsyrezon8NZ3ZCzode5jS2PXzN1C68amwDmp2bgAEF4jDG7NUbdRYCjR8r"
+        ],
+        [
+            "7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f",
+            "imitador vinheta sogro xerife veleiro pomar volumoso tratador imitador vinheta sogro xerife veleiro pomar volumoso tratador imitador viga",
+            "17040704dd985478b7d0666c7078201e3cd7d1fd1aca0d7d47c98a91ec7845500c611d987339a1d4c12bc506feb7c486eef0aa8ce679b1d184db5ca40fe8ef67",
+            "xprv9s21ZrQH143K3XAGBJxF36qFzxkFaSEsNjqKvCtT3s7WfzgMBRcv8G9K2CRGXXhLYPWKSipBrd9dyLSRuTzQWbAJkhghki7Nn13QfHqCSBq"
+        ],
+        [
+            "808080808080808080808080808080808080808080808080",
+            "inalador acirrar barulho abotoar afivelar coruja abutre amostra inalador acirrar barulho abotoar afivelar coruja abutre amostra inalador afastar",
+            "0f637bf3a487c26fb73f6a464f62ef1f6ca73a6ae083e220374c82881bf4ed2dafd874956ce368c4441e6269759c5864197e87421fbcdb7f6d63df17b4f7df81",
+            "xprv9s21ZrQH143K25VJsZdwtDCmzZ5C2LkJyNDKrHiFfHHBEmtvn77g7qrBRGHTum98TqU7sWCGFZ8vjtcPVAfgGcV51vi2BrPR66KC7wNxb3z"
+        ],
+        [
+            "ffffffffffffffffffffffffffffffffffffffffffffffff",
+            "zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido viaduto",
+            "042e40dacea1df76335445c37171e5c0fde334236abe1b5d69378548875d157968dfff5889641f16690dca9baa4d9e5fbf56e3aaf0765144ba96b819f37fd0ae",
+            "xprv9s21ZrQH143K3xAXH3i9VReyK3HSyzSmN11DXikYFTA3senE3iWDCdYTFXL9JkBM7CeCS31NBBHNu2tH5T1iDWCBEu1TeWLfELH4CaGAiRR"
+        ],
+        [
+            "0000000000000000000000000000000000000000000000000000000000000000",
+            "abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate abacate alinhar",
+            "8fe67c9f53a30f75513830e18f6bd0950354297a4977393fae3577363393e679cc13452bcfc9460b28a913ab8de9efc55f5901d1ba77e5eec791afd967768607",
+            "xprv9s21ZrQH143K3UVmtSkznKJCHUGjkjoHkUd6dxdfo91K8sdpEVmzjyRMB3Sf2WC7WKzmZLw2cfJ43LAEENq2v1gASK4TmMUTkbWVoJaZLge"
+        ],
+        [
+            "7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f",
+            "imitador vinheta sogro xerife veleiro pomar volumoso tratador imitador vinheta sogro xerife veleiro pomar volumoso tratador imitador vinheta sogro xerife veleiro pomar volumoso sucata",
+            "feac9ad4e1a4a4399a7d57fe47bf64b404a7588eca1025abfa299365f7a75639317e2c89a94812db33405aa0213846bfd6d53dfd02743e2cf3b6984eb9fcf19f",
+            "xprv9s21ZrQH143K2Syz6ZuTcKmPtPee4Xn5HMEnuZcNZ1s7hJdgjRLFJ8f4d8DnoBBTUchCBjBnjubsz3wum7zbhdp5h9hm4g6DVDo2LaHGJ2a"
+        ],
+        [
+            "8080808080808080808080808080808080808080808080808080808080808080",
+            "inalador acirrar barulho abotoar afivelar coruja abutre amostra inalador acirrar barulho abotoar afivelar coruja abutre amostra inalador acirrar barulho abotoar afivelar coruja abutre asilado",
+            "32c8feae6a0bee33166468a770cb28459727e10f4f5ffef64977d5ef52a68ec51d832751a10c025058612ab256052cdfa9d8c5c87560de0453efe5a7d4597771",
+            "xprv9s21ZrQH143K4XMzpdgrkDGxnU31ezynvtw3iBEfRB8sriHpEwyu2Gb65ao9YLcTTWTyxNh2g2AdtYmZ4wpTaAxLpJBzWY7jAvG1HyotoEt"
+        ],
+        [
+            "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+            "zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido zumbido validade",
+            "739a6edd208d09e28fa97f8e8709aaf185e173125b1b427c04d1539173c88b78e81610a759e14f97a2038dcdc2c466a072788e3d7c88cc9bf36b96cb29510e77",
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     "spanish": [
         [
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@@ -875,4 +1021,4 @@
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-}
\ No newline at end of file
+}