diff --git a/scripts/phase0/build_spec.py b/scripts/phase0/build_spec.py
index 36d039c2ca..457a13da02 100644
--- a/scripts/phase0/build_spec.py
+++ b/scripts/phase0/build_spec.py
@@ -13,9 +13,17 @@ def build_phase0_spec(sourcefile, outfile):
     NewType,
     Tuple,
 )
-from eth2spec.utils.minimal_ssz import *
+from eth2spec.utils.minimal_ssz import (
+    SSZType,
+    hash_tree_root,
+    signing_root,
+)
 from eth2spec.utils.hash_function import hash
-from eth2spec.utils.bls import *
+from eth2spec.utils.bls import (
+    bls_aggregate_pubkeys,
+    bls_verify,
+    bls_verify_multiple,
+)
 
 
 # stub, will get overwritten by real var
diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index 3ee4437097..b5f208488d 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -17,7 +17,7 @@
         - [Initial values](#initial-values)
         - [Time parameters](#time-parameters)
         - [State list lengths](#state-list-lengths)
-        - [Reward and penalty quotients](#reward-and-penalty-quotients)
+        - [Rewards and penalties](#rewards-and-penalties)
         - [Max operations per block](#max-operations-per-block)
         - [Signature domains](#signature-domains)
     - [Data structures](#data-structures)
@@ -103,7 +103,7 @@
             - [Helper functions](#helper-functions-1)
             - [Justification and finalization](#justification-and-finalization)
             - [Crosslinks](#crosslinks)
-            - [Rewards and penalties](#rewards-and-penalties)
+            - [Rewards and penalties](#rewards-and-penalties-1)
             - [Registry updates](#registry-updates)
             - [Slashings](#slashings)
             - [Final updates](#final-updates)
@@ -220,17 +220,17 @@ These configurations are updated for releases, but may be out of sync during `de
 | `LATEST_ACTIVE_INDEX_ROOTS_LENGTH` | `2**13` (= 8,192) | epochs | ~36 days |
 | `LATEST_SLASHED_EXIT_LENGTH` | `2**13` (= 8,192) | epochs | ~36 days |
 
-### Reward and penalty quotients
+### Rewards and penalties
 
 | Name | Value |
 | - | - |
-| `BASE_REWARD_QUOTIENT` | `2**5` (= 32) |
+| `BASE_REWARD_FACTOR` | `2**5` (= 32) |
 | `WHISTLEBLOWING_REWARD_QUOTIENT` | `2**9` (= 512) |
 | `PROPOSER_REWARD_QUOTIENT` | `2**3` (= 8) |
 | `INACTIVITY_PENALTY_QUOTIENT` | `2**25` (= 33,554,432) |
 | `MIN_SLASHING_PENALTY_QUOTIENT` | `2**5` (= 32) |
 
-* **The `BASE_REWARD_QUOTIENT` is NOT final. Once all other protocol details are finalized, it will be adjusted to target a theoretical maximum total issuance of `2**21` ETH per year if `2**27` ETH is validating (and therefore `2**20` per year if `2**25` ETH is validating, etc.)**
+* **The `BASE_REWARD_FACTOR` is NOT final. Once all other protocol details are finalized, it will be adjusted to target a theoretical maximum total issuance of `2**21` ETH per year if `2**27` ETH is validating (and therefore `2**20` per year if `2**25` ETH is validating, etc.)**
 * The `INACTIVITY_PENALTY_QUOTIENT` equals `INVERSE_SQRT_E_DROP_TIME**2` where `INVERSE_SQRT_E_DROP_TIME := 2**12 epochs` (~18 days) is the time it takes the inactivity penalty to reduce the balance of non-participating [validators](#dfn-validator) to about `1/sqrt(e) ~= 60.6%`. Indeed, the balance retained by offline [validators](#dfn-validator) after `n` epochs is about `(1 - 1/INACTIVITY_PENALTY_QUOTIENT)**(n**2/2)` so after `INVERSE_SQRT_E_DROP_TIME` epochs it is roughly `(1 - 1/INACTIVITY_PENALTY_QUOTIENT)**(INACTIVITY_PENALTY_QUOTIENT/2) ~= 1/sqrt(e)`.
 
 ### Max operations per block
@@ -961,9 +961,9 @@ def bytes_to_int(data: bytes) -> int:
 ```python
 def get_total_balance(state: BeaconState, indices: List[ValidatorIndex]) -> Gwei:
     """
-    Return the combined effective balance of an array of ``validators``.
+    Return the combined effective balance of the ``indices``. (1 Gwei minimum to avoid divisions by zero.)
     """
-    return sum([state.validator_registry[index].effective_balance for index in indices])
+    return max(sum([state.validator_registry[index].effective_balance for index in indices]), 1)
 ```
 
 ### `get_domain`
@@ -1411,10 +1411,9 @@ def process_crosslinks(state: BeaconState) -> None:
 
 ```python
 def get_base_reward(state: BeaconState, index: ValidatorIndex) -> Gwei:
-    adjusted_quotient = integer_squareroot(get_total_active_balance(state)) // BASE_REWARD_QUOTIENT
-    if adjusted_quotient == 0:
-        return 0
-    return state.validator_registry[index].effective_balance // adjusted_quotient // BASE_REWARDS_PER_EPOCH
+    total_balance = get_total_active_balance(state)
+    effective_balance = state.validator_registry[index].effective_balance
+    return effective_balance * BASE_REWARD_FACTOR // integer_squareroot(total_balance) // BASE_REWARDS_PER_EPOCH
 ```
 
 ```python
@@ -1529,10 +1528,9 @@ def process_registry_updates(state: BeaconState) -> None:
 ```python
 def process_slashings(state: BeaconState) -> None:
     current_epoch = get_current_epoch(state)
-    active_validator_indices = get_active_validator_indices(state, current_epoch)
-    total_balance = get_total_balance(state, active_validator_indices)
+    total_balance = get_total_active_balance(state)
 
-    # Compute `total_penalties`
+    # Compute slashed balances in the current epoch
     total_at_start = state.latest_slashed_balances[(current_epoch + 1) % LATEST_SLASHED_EXIT_LENGTH]
     total_at_end = state.latest_slashed_balances[current_epoch % LATEST_SLASHED_EXIT_LENGTH]
     total_penalties = total_at_end - total_at_start
@@ -1773,7 +1771,8 @@ def process_deposit(state: BeaconState, deposit: Deposit) -> None:
     validator_pubkeys = [v.pubkey for v in state.validator_registry]
     if pubkey not in validator_pubkeys:
         # Verify the deposit signature (proof of possession).
-        # Invalid signatures are allowed by the deposit contract, and hence included on-chain, but must not be processed.
+        # Invalid signatures are allowed by the deposit contract,
+        # and hence included on-chain, but must not be processed.
         # Note: deposits are valid across forks, hence the deposit domain is retrieved directly from `bls_domain`
         if not bls_verify(
             pubkey, signing_root(deposit.data), deposit.data.signature, bls_domain(DOMAIN_DEPOSIT)
diff --git a/specs/test_formats/README.md b/specs/test_formats/README.md
index ac84d5bc08..277e986d55 100644
--- a/specs/test_formats/README.md
+++ b/specs/test_formats/README.md
@@ -35,7 +35,8 @@ Test formats:
 - [`bls`](./bls/README.md)
 - [`operations`](./operations/README.md)
 - [`shuffling`](./shuffling/README.md)
-- [`ssz`](./ssz/README.md)
+- [`ssz_generic`](./ssz_generic/README.md)
+- [`ssz_static`](./ssz_static/README.md)
 - More formats are planned, see tracking issues for CI/testing
 
 ## Glossary
diff --git a/test_libs/pyspec/eth2spec/test/block_processing/test_process_transfer.py b/test_libs/pyspec/eth2spec/test/block_processing/test_process_transfer.py
index 83af755743..bd435d67a1 100644
--- a/test_libs/pyspec/eth2spec/test/block_processing/test_process_transfer.py
+++ b/test_libs/pyspec/eth2spec/test/block_processing/test_process_transfer.py
@@ -89,7 +89,7 @@ def test_invalid_signature(state):
     transfer = get_valid_transfer(state)
     # un-activate so validator can transfer
     state.validator_registry[transfer.sender].activation_eligibility_epoch = spec.FAR_FUTURE_EPOCH
-    
+
     yield from run_transfer_processing(state, transfer, False)
 
 
@@ -140,7 +140,13 @@ def test_insufficient_balance(state):
 def test_no_dust_sender(state):
     sender_index = get_active_validator_indices(state, get_current_epoch(state))[-1]
     balance = state.balances[sender_index]
-    transfer = get_valid_transfer(state, sender_index=sender_index, amount=balance - spec.MIN_DEPOSIT_AMOUNT + 1, fee=0, signed=True)
+    transfer = get_valid_transfer(
+        state,
+        sender_index=sender_index,
+        amount=balance - spec.MIN_DEPOSIT_AMOUNT + 1,
+        fee=0,
+        signed=True,
+    )
 
     # un-activate so validator can transfer
     state.validator_registry[transfer.sender].activation_epoch = spec.FAR_FUTURE_EPOCH
diff --git a/test_libs/pyspec/eth2spec/test/conftest.py b/test_libs/pyspec/eth2spec/test/conftest.py
index dadb0d5d06..5e8ec708a1 100644
--- a/test_libs/pyspec/eth2spec/test/conftest.py
+++ b/test_libs/pyspec/eth2spec/test/conftest.py
@@ -3,6 +3,7 @@
 # We import pytest only when it's present, i.e. when we are running tests.
 # The test-cases themselves can be generated without installing pytest.
 
+
 def module_exists(module_name):
     try:
         __import__(module_name)
diff --git a/test_libs/pyspec/eth2spec/test/helpers/block.py b/test_libs/pyspec/eth2spec/test/helpers/block.py
index c557e02452..715cf82dbe 100644
--- a/test_libs/pyspec/eth2spec/test/helpers/block.py
+++ b/test_libs/pyspec/eth2spec/test/helpers/block.py
@@ -77,4 +77,3 @@ def build_empty_block(state, slot=None, signed=False):
 
 def build_empty_block_for_next_slot(state, signed=False):
     return build_empty_block(state, state.slot + 1, signed=signed)
-
diff --git a/test_libs/pyspec/eth2spec/test/sanity/test_slots.py b/test_libs/pyspec/eth2spec/test/sanity/test_slots.py
index 92e0251ca5..4c3897a6c2 100644
--- a/test_libs/pyspec/eth2spec/test/sanity/test_slots.py
+++ b/test_libs/pyspec/eth2spec/test/sanity/test_slots.py
@@ -55,4 +55,3 @@ def test_over_epoch_boundary(state):
     yield 'slots', slots
     process_slots(state, state.slot + slots)
     yield 'post', state
-