diff --git a/configs/mainnet.yaml b/configs/mainnet.yaml
index 2d8de5390..6eb5641d0 100644
--- a/configs/mainnet.yaml
+++ b/configs/mainnet.yaml
@@ -94,9 +94,6 @@ PERSISTENT_COMMITTEE_PERIOD: 2048
 MAX_EPOCHS_PER_CROSSLINK: 64
 # 2**2 (= 4) epochs 25.6 minutes
 MIN_EPOCHS_TO_INACTIVITY_PENALTY: 4
-# 2**14 (= 16,384) epochs ~73 days
-EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS: 16384
-
 
 
 # State vector lengths
@@ -146,12 +143,73 @@ DOMAIN_BEACON_ATTESTER: 0x01000000
 DOMAIN_RANDAO: 0x02000000
 DOMAIN_DEPOSIT: 0x03000000
 DOMAIN_VOLUNTARY_EXIT: 0x04000000
+# Phase 1
 DOMAIN_SHARD_PROPOSAL: 0x80000000
 DOMAIN_SHARD_COMMITTEE: 0x81000000
 DOMAIN_LIGHT_CLIENT: 0x82000000
 DOMAIN_CUSTODY_BIT_SLASHING: 0x83000000
 
 
-# Phase 1
+# Phase 1: Upgrade from Phase 0
 # ---------------------------------------------------------------
+PHASE_1_FORK_VERSION: 0x01000000
 INITIAL_ACTIVE_SHARDS: 64
+# Placeholder
+INITIAL_GASPRICE: 10
+
+
+# Phase 1: General
+# ---------------------------------------------------------------
+# 2**10` (= 1024)
+MAX_SHARDS: 1024
+# 2**3 (= 8) | online epochs | ~51 min
+ONLINE_PERIOD: 8
+# 2**7 (= 128)
+LIGHT_CLIENT_COMMITTEE_SIZE: 128
+# 2**8 (= 256) | epochs | ~27 hours
+LIGHT_CLIENT_COMMITTEE_PERIOD: 256
+# 2**8 (= 256) | epochs | ~27 hours
+SHARD_COMMITTEE_PERIOD: 256
+# 2**18 (= 262,144)
+SHARD_BLOCK_CHUNK_SIZE: 262144
+# 2**2 (= 4)
+MAX_SHARD_BLOCK_CHUNKS: 4
+# 3 * 2**16` (= 196,608)
+TARGET_SHARD_BLOCK_SIZE: 196608
+# Note: MAX_SHARD_BLOCKS_PER_ATTESTATION is derived from the list length.
+SHARD_BLOCK_OFFSETS: [1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233]
+# len(SHARD_BLOCK_OFFSETS)
+MAX_SHARD_BLOCKS_PER_ATTESTATION: 12
+# 2**14 (= 16,384) Gwei
+MAX_GASPRICE: 16384
+# 2**5 (= 32) Gwei
+MIN_GASPRICE: 32
+#  2**3 (= 8)
+GASPRICE_ADJUSTMENT_COEFFICIENT: 8
+
+
+# Phase 1: Custody Game
+# ---------------------------------------------------------------
+
+# Time parameters
+# 2**1 (= 2) epochs, 12.8 minutes
+RANDAO_PENALTY_EPOCHS: 2
+# 2**14 (= 16,384) epochs ~73 days
+EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS: 16384
+# 2**11 (= 2,048) epochs, ~9 days
+EPOCHS_PER_CUSTODY_PERIOD: 2048
+# 2**11 (= 2,048) epochs, ~9 days
+CUSTODY_PERIOD_TO_RANDAO_PADDING: 2048
+# 2**7 (= 128) epochs, ~14 hours
+MAX_REVEAL_LATENESS_DECREMENT: 128
+
+# Max operations
+# 2**8 (= 256)
+MAX_CUSTODY_KEY_REVEALS: 256
+MAX_EARLY_DERIVED_SECRET_REVEALS: 1
+MAX_CUSTODY_SLASHINGS: 1
+
+# Reward and penalty quotients
+EARLY_DERIVED_SECRET_REVEAL_SLOT_REWARD_MULTIPLE: 2
+# 2**8 (= 256)
+MINOR_REWARD_QUOTIENT: 256
diff --git a/configs/minimal.yaml b/configs/minimal.yaml
index d45bdbd09..486803467 100644
--- a/configs/minimal.yaml
+++ b/configs/minimal.yaml
@@ -21,14 +21,13 @@ MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 64
 # Jan 3, 2020
 MIN_GENESIS_TIME: 1578009600
 
-#
-#
+
 # Fork Choice
 # ---------------------------------------------------------------
 # 2**1 (= 1)
 SAFE_SLOTS_TO_UPDATE_JUSTIFIED: 2
 
-#
+
 # Validator
 # ---------------------------------------------------------------
 # [customized] process deposits more quickly, but insecure
@@ -94,12 +93,6 @@ PERSISTENT_COMMITTEE_PERIOD: 2048
 MAX_EPOCHS_PER_CROSSLINK: 4
 # 2**2 (= 4) epochs
 MIN_EPOCHS_TO_INACTIVITY_PENALTY: 4
-# [customized] 2**12 (= 4,096) epochs
-EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS: 4096
-# 2**2 (= 4) epochs
-EPOCHS_PER_CUSTODY_PERIOD: 4
-# 2**2 (= 4) epochs
-CUSTODY_PERIOD_TO_RANDAO_PADDING: 4
 
 
 # State vector lengths
@@ -149,13 +142,75 @@ DOMAIN_BEACON_ATTESTER: 0x01000000
 DOMAIN_RANDAO: 0x02000000
 DOMAIN_DEPOSIT: 0x03000000
 DOMAIN_VOLUNTARY_EXIT: 0x04000000
+# Phase 1
 DOMAIN_SHARD_PROPOSAL: 0x80000000
 DOMAIN_SHARD_COMMITTEE: 0x81000000
 DOMAIN_LIGHT_CLIENT: 0x82000000
 DOMAIN_CUSTODY_BIT_SLASHING: 0x83000000
 
 
-# Phase 1
+# Phase 1: Upgrade from Phase 0
 # ---------------------------------------------------------------
+# [customized] for testnet distinction
+PHASE_1_FORK_VERSION: 0x01000001
 # [customized] reduced for testing
 INITIAL_ACTIVE_SHARDS: 4
+# Placeholder
+INITIAL_GASPRICE: 10
+
+
+# Phase 1: General
+# ---------------------------------------------------------------
+# [customized] reduced for testing
+MAX_SHARDS: 8
+# 2**3 (= 8) | online epochs
+ONLINE_PERIOD: 8
+# 2**7 (= 128)
+LIGHT_CLIENT_COMMITTEE_SIZE: 128
+# 2**8 (= 256) | epochs
+LIGHT_CLIENT_COMMITTEE_PERIOD: 256
+# 2**8 (= 256) | epochs
+SHARD_COMMITTEE_PERIOD: 256
+# 2**18 (= 262,144)
+SHARD_BLOCK_CHUNK_SIZE: 262144
+# 2**2 (= 4)
+MAX_SHARD_BLOCK_CHUNKS: 4
+# 3 * 2**16` (= 196,608)
+TARGET_SHARD_BLOCK_SIZE: 196608
+# Note: MAX_SHARD_BLOCKS_PER_ATTESTATION is derived from the list length.
+SHARD_BLOCK_OFFSETS: [1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233]
+# len(SHARD_BLOCK_OFFSETS)
+MAX_SHARD_BLOCKS_PER_ATTESTATION: 12
+# 2**14 (= 16,384) Gwei
+MAX_GASPRICE: 16384
+# 2**5 (= 32) Gwei
+MIN_GASPRICE: 32
+#  2**3 (= 8)
+GASPRICE_ADJUSTMENT_COEFFICIENT: 8
+
+
+# Phase 1: Custody Game
+# ---------------------------------------------------------------
+
+# Time parameters
+# 2**1 (= 2) epochs
+RANDAO_PENALTY_EPOCHS: 2
+# [customized] quicker for testing
+EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS: 4096
+# 2**11 (= 2,048) epochs,
+EPOCHS_PER_CUSTODY_PERIOD: 2048
+# 2**11 (= 2,048) epochs,
+CUSTODY_PERIOD_TO_RANDAO_PADDING: 2048
+# 2**7 (= 128) epochs,
+MAX_REVEAL_LATENESS_DECREMENT: 128
+
+# Max operations
+# 2**8 (= 256)
+MAX_CUSTODY_KEY_REVEALS: 256
+MAX_EARLY_DERIVED_SECRET_REVEALS: 1
+MAX_CUSTODY_SLASHINGS: 1
+
+# Reward and penalty quotients
+EARLY_DERIVED_SECRET_REVEAL_SLOT_REWARD_MULTIPLE: 2
+# 2**8 (= 256)
+MINOR_REWARD_QUOTIENT: 256
diff --git a/specs/phase1/beacon-chain.md b/specs/phase1/beacon-chain.md
index 14b83dd03..b53ce1de1 100644
--- a/specs/phase1/beacon-chain.md
+++ b/specs/phase1/beacon-chain.md
@@ -107,7 +107,6 @@ Configuration is not namespaced. Instead it is strictly an extension;
 | `TARGET_SHARD_BLOCK_SIZE` | `3 * 2**16` (= 196,608) | |
 | `SHARD_BLOCK_OFFSETS` | `[1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233]` | |
 | `MAX_SHARD_BLOCKS_PER_ATTESTATION` | `len(SHARD_BLOCK_OFFSETS)` | |
-| `EMPTY_CHUNK_ROOT` | `hash_tree_root(ByteList[SHARD_BLOCK_CHUNK_SIZE]())` | |
 | `MAX_GASPRICE` | `Gwei(2**14)` (= 16,384) | Gwei | |
 | `MIN_GASPRICE` | `Gwei(2**5)` (= 32) | Gwei | |
 | `GASPRICE_ADJUSTMENT_COEFFICIENT` | `2**3` (= 8) | |
@@ -406,8 +405,9 @@ def committee_to_compact_committee(state: BeaconState, committee: Sequence[Valid
 
 ```python
 def chunks_to_body_root(chunks: List[Bytes32, MAX_SHARD_BLOCK_CHUNKS]) -> Root:
+    empty_chunk_root = hash_tree_root(ByteList[SHARD_BLOCK_CHUNK_SIZE]())
     return hash_tree_root(Vector[Bytes32, MAX_SHARD_BLOCK_CHUNKS](
-        chunks + [EMPTY_CHUNK_ROOT] * (MAX_SHARD_BLOCK_CHUNKS - len(chunks))
+        chunks + [empty_chunk_root] * (MAX_SHARD_BLOCK_CHUNKS - len(chunks))
     ))
 ```
 
diff --git a/specs/phase1/custody-game.md b/specs/phase1/custody-game.md
index 1e7dc0216..54a3f4332 100644
--- a/specs/phase1/custody-game.md
+++ b/specs/phase1/custody-game.md
@@ -45,18 +45,20 @@ This document details the beacon chain additions and changes in Phase 1 of Ether
 ## Constants
 
 ### Misc
+
 | Name | Value | Unit |
 | - | - |
 | `BLS12_381_Q` | `4002409555221667393417789825735904156556882819939007885332058136124031650490837864442687629129015664037894272559787` |
-| `MINOR_REWARD_QUOTIENT` | `2**8` (= 256) |
 | `BYTES_PER_CUSTODY_ATOM` | `48` | bytes |
 
+## Configuration
+
 ### Time parameters
 
 | Name | Value | Unit | Duration |
 | - | - | :-: | :-: |
 | `RANDAO_PENALTY_EPOCHS` | `2**1` (= 2) | epochs | 12.8 minutes |
-| `EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS` | `2**14` | epochs | ~73 days |
+| `EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS` | `2**14` (= 16,384) | epochs | ~73 days |
 | `EPOCHS_PER_CUSTODY_PERIOD` | `2**11` (= 2,048) | epochs | ~9 days |
 | `CUSTODY_PERIOD_TO_RANDAO_PADDING` | `2**11` (= 2,048) | epochs | ~9 days |
 | `MAX_REVEAL_LATENESS_DECREMENT` | `2**7` (= 128) | epochs | ~14 hours |
@@ -74,6 +76,7 @@ This document details the beacon chain additions and changes in Phase 1 of Ether
 | Name | Value |
 | - | - |
 | `EARLY_DERIVED_SECRET_REVEAL_SLOT_REWARD_MULTIPLE` | `2**1` (= 2) |
+| `MINOR_REWARD_QUOTIENT` | `2**8` (= 256) |
 
 ### Signature domain types
 
diff --git a/specs/phase1/phase1-fork.md b/specs/phase1/phase1-fork.md
index c6bbc7363..56eee410b 100644
--- a/specs/phase1/phase1-fork.md
+++ b/specs/phase1/phase1-fork.md
@@ -34,7 +34,7 @@ Warning: this configuration is not definitive.
 
 | Name | Value |
 | - | - | - |
-| `PHASE_1_FORK_VERSION` | `Version('0x00000001')` |
+| `PHASE_1_FORK_VERSION` | `Version('0x01000000')` |
 | `INITIAL_ACTIVE_SHARDS` | `2**6` (= 64) |
 | `INITIAL_GASPRICE` | `Gwei(10)` |