diff --git a/configs/constant_presets/mainnet.yaml b/configs/constant_presets/mainnet.yaml
index 6ac3f422f..dca2a69ba 100644
--- a/configs/constant_presets/mainnet.yaml
+++ b/configs/constant_presets/mainnet.yaml
@@ -48,7 +48,7 @@ GENESIS_FORK_VERSION: 0x00000000
 GENESIS_SLOT: 0
 # 2**64 - 1
 FAR_FUTURE_EPOCH: 18446744073709551615
-BLS_WITHDRAWAL_PREFIX_BYTE: 0x00
+BLS_WITHDRAWAL_PREFIX: 0
 
 
 # Time parameters
@@ -90,7 +90,7 @@ LATEST_SLASHED_EXIT_LENGTH: 8192
 # Reward and penalty quotients
 # ---------------------------------------------------------------
 # 2**5 (= 32)
-BASE_REWARD_QUOTIENT: 32
+BASE_REWARD_FACTOR: 32
 # 2**9 (= 512)
 WHISTLEBLOWING_REWARD_QUOTIENT: 512
 # 2**3 (= 8)
diff --git a/configs/constant_presets/minimal.yaml b/configs/constant_presets/minimal.yaml
index 73448c3c6..fa337cfbf 100644
--- a/configs/constant_presets/minimal.yaml
+++ b/configs/constant_presets/minimal.yaml
@@ -47,7 +47,7 @@ GENESIS_FORK_VERSION: 0x00000000
 GENESIS_SLOT: 0
 # 2**64 - 1
 FAR_FUTURE_EPOCH: 18446744073709551615
-BLS_WITHDRAWAL_PREFIX_BYTE: 0x00
+BLS_WITHDRAWAL_PREFIX: 0
 
 
 # Time parameters
@@ -58,23 +58,23 @@ SECONDS_PER_SLOT: 6
 MIN_ATTESTATION_INCLUSION_DELAY: 2
 # [customized] fast epochs
 SLOTS_PER_EPOCH: 8
-# 2**0 (= 1) epochs 6.4 minutes
+# 2**0 (= 1) epochs
 MIN_SEED_LOOKAHEAD: 1
-# 2**2 (= 4) epochs 25.6 minutes
+# 2**2 (= 4) epochs
 ACTIVATION_EXIT_DELAY: 4
 # [customized] higher frequency new deposits from eth1 for testing
 SLOTS_PER_ETH1_VOTING_PERIOD: 16
 # [customized] smaller state
 SLOTS_PER_HISTORICAL_ROOT: 64
-# 2**8 (= 256) epochs ~27 hours
+# 2**8 (= 256) epochs
 MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256
-# 2**11 (= 2,048) epochs 9 days
+# 2**11 (= 2,048) epochs
 PERSISTENT_COMMITTEE_PERIOD: 2048
-# 2**6 (= 64) epochs ~7 hours
+# 2**6 (= 64) epochs
 MAX_EPOCHS_PER_CROSSLINK: 64
-# 2**2 (= 4) epochs 25.6 minutes
+# 2**2 (= 4) epochs
 MIN_EPOCHS_TO_INACTIVITY_PENALTY: 4
-# [customized] 2**12 (= 4,096) epochs 18 days
+# [customized] 2**12 (= 4,096) epochs
 EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS: 4096
 
 
@@ -91,7 +91,7 @@ LATEST_SLASHED_EXIT_LENGTH: 64
 # Reward and penalty quotients
 # ---------------------------------------------------------------
 # 2**5 (= 32)
-BASE_REWARD_QUOTIENT: 32
+BASE_REWARD_FACTOR: 32
 # 2**9 (= 512)
 WHISTLEBLOWING_REWARD_QUOTIENT: 512
 # 2**3 (= 8)
diff --git a/test_libs/pyspec/eth2spec/test/helpers/deposits.py b/test_libs/pyspec/eth2spec/test/helpers/deposits.py
index 8f437ec89..1d4761753 100644
--- a/test_libs/pyspec/eth2spec/test/helpers/deposits.py
+++ b/test_libs/pyspec/eth2spec/test/helpers/deposits.py
@@ -67,7 +67,7 @@ def prepare_state_and_deposit(spec, state, validator_index, amount, withdrawal_c
 
     # insecurely use pubkey as withdrawal key if no credentials provided
     if withdrawal_credentials is None:
-        withdrawal_credentials = spec.BLS_WITHDRAWAL_PREFIX_BYTE + spec.hash(pubkey)[1:]
+        withdrawal_credentials = spec.int_to_bytes(spec.BLS_WITHDRAWAL_PREFIX, length=1) + spec.hash(pubkey)[1:]
 
     deposit, root, deposit_data_leaves = build_deposit(
         spec,
diff --git a/test_libs/pyspec/eth2spec/test/helpers/genesis.py b/test_libs/pyspec/eth2spec/test/helpers/genesis.py
index 83af56621..a3ca915ef 100644
--- a/test_libs/pyspec/eth2spec/test/helpers/genesis.py
+++ b/test_libs/pyspec/eth2spec/test/helpers/genesis.py
@@ -5,7 +5,7 @@ from eth2spec.utils.ssz.ssz_impl import hash_tree_root
 def build_mock_validator(spec, i: int, balance: int):
     pubkey = pubkeys[i]
     # insecurely use pubkey as withdrawal key as well
-    withdrawal_credentials = spec.BLS_WITHDRAWAL_PREFIX_BYTE + spec.hash(pubkey)[1:]
+    withdrawal_credentials = spec.int_to_bytes(spec.BLS_WITHDRAWAL_PREFIX, length=1) + spec.hash(pubkey)[1:]
     return spec.Validator(
         pubkey=pubkeys[i],
         withdrawal_credentials=withdrawal_credentials,
diff --git a/test_libs/pyspec/eth2spec/test/helpers/transfers.py b/test_libs/pyspec/eth2spec/test/helpers/transfers.py
index e619c5569..4d40deee7 100644
--- a/test_libs/pyspec/eth2spec/test/helpers/transfers.py
+++ b/test_libs/pyspec/eth2spec/test/helpers/transfers.py
@@ -32,7 +32,7 @@ def get_valid_transfer(spec, state, slot=None, sender_index=None, amount=None, f
 
     # ensure withdrawal_credentials reproducible
     state.validator_registry[transfer.sender].withdrawal_credentials = (
-        spec.BLS_WITHDRAWAL_PREFIX_BYTE + spec.hash(transfer.pubkey)[1:]
+        spec.int_to_bytes(spec.BLS_WITHDRAWAL_PREFIX, length=1) + spec.hash(transfer.pubkey)[1:]
     )
 
     return transfer
diff --git a/test_libs/pyspec/eth2spec/test/phase_0/block_processing/test_process_deposit.py b/test_libs/pyspec/eth2spec/test/phase_0/block_processing/test_process_deposit.py
index c50b11f2e..603a07c3d 100644
--- a/test_libs/pyspec/eth2spec/test/phase_0/block_processing/test_process_deposit.py
+++ b/test_libs/pyspec/eth2spec/test/phase_0/block_processing/test_process_deposit.py
@@ -101,7 +101,7 @@ def test_invalid_sig_top_up(spec, state):
 def test_invalid_withdrawal_credentials_top_up(spec, state):
     validator_index = 0
     amount = spec.MAX_EFFECTIVE_BALANCE // 4
-    withdrawal_credentials = spec.BLS_WITHDRAWAL_PREFIX_BYTE + spec.hash(b"junk")[1:]
+    withdrawal_credentials = spec.int_to_bytes(spec.BLS_WITHDRAWAL_PREFIX, length=1) + spec.hash(b"junk")[1:]
     deposit = prepare_state_and_deposit(
         spec,
         state,