diff --git a/fork_choice/.pages b/fork_choice/.pages
deleted file mode 100644
index a5e6ccc9046..00000000000
--- a/fork_choice/.pages
+++ /dev/null
@@ -1,7 +0,0 @@
-nav:
-    - ...
-    - Fork Choice -- Core:
-        - phase0: specs/phase0/fork-choice
-        - bellatrix: specs/bellatrix/fork-choice
-        - capella: specs/capella/fork-choice
-        - deneb: specs/deneb/fork-choice
diff --git a/fork_choice/safe-block.md b/fork_choice/safe-block.md
deleted file mode 100644
index 00f75e92ce4..00000000000
--- a/fork_choice/safe-block.md
+++ /dev/null
@@ -1,41 +0,0 @@
-# Fork Choice -- Safe Block
-
-<!-- mdformat-toc start --slug=github --no-anchors --maxlevel=6 --minlevel=2 -->
-
-- [Introduction](#introduction)
-- [`get_safe_execution_block_hash`](#get_safe_execution_block_hash)
-
-<!-- mdformat-toc end -->
-
-## Introduction
-
-Under honest majority and certain network synchronicity assumptions there exists
-a block that is safe from re-orgs. Normally this block is pretty close to the
-head of canonical chain which makes it valuable to expose a safe block to users.
-
-This section describes an algorithm to find a safe block.
-
-## `get_safe_execution_block_hash`
-
-*Note*: `retrieve_fast_confirmed_root()` is an implementation dependent function
-that retrieves the most recent `confirmed_root` determined by the
-[Fast Confirmation](../specs/phase0/fast-confirmation.md) algorithm.
-
-```python
-def get_safe_execution_block_hash(store: Store) -> Hash32:
-    safe_block_root = retrieve_fast_confirmed_root()
-    safe_block = store.blocks[safe_block_root]
-
-    if compute_epoch_at_slot(safe_block.slot) >= GLOAS_FORK_EPOCH:
-        safe_block_bid = safe_block.body.signed_execution_payload_bid.message
-        return safe_block_bid.parent_block_hash
-    if compute_epoch_at_slot(safe_block.slot) >= BELLATRIX_FORK_EPOCH:
-        return safe_block.body.execution_payload.block_hash
-    else:
-        # Return Hash32() if no safe block is yet available
-        return Hash32()
-```
-
-*Note*: This helper uses beacon block container extended in
-[Bellatrix](../specs/bellatrix/beacon-chain.md) and
-[Gloas](../specs/gloas/beacon-chain.md).
diff --git a/specs/bellatrix/fast-confirmation.md b/specs/bellatrix/fast-confirmation.md
new file mode 100644
index 00000000000..4bfcb939e0c
--- /dev/null
+++ b/specs/bellatrix/fast-confirmation.md
@@ -0,0 +1,29 @@
+# Bellatrix -- Fast Confirmation
+
+<!-- mdformat-toc start --slug=github --no-anchors --maxlevel=6 --minlevel=2 -->
+
+- [Introduction](#introduction)
+- [Safe execution block](#safe-execution-block)
+  - [New `get_safe_execution_block_hash`](#new-get_safe_execution_block_hash)
+
+<!-- mdformat-toc end -->
+
+## Introduction
+
+This is the modification of the fast confirmation rule specification
+accompanying Bellatrix.
+
+## Safe execution block
+
+With Bellatrix introducing execution payload, `get_safe_execution_block_hash`
+function is introduced. This function returns the block hash of the payload
+included into the most recent confirmed block. This block hash is communicated
+to ExecutionEngine as a hash of a safe block.
+
+### New `get_safe_execution_block_hash`
+
+```python
+def get_safe_execution_block_hash(fcr_store: FastConfirmationStore) -> Hash32:
+    safe_block = fcr_store.store.blocks[fcr_store.confirmed_root]
+    return safe_block.body.execution_payload.block_hash
+```
diff --git a/specs/bellatrix/fork-choice.md b/specs/bellatrix/fork-choice.md
index ac7e1a55127..d2b884cdd54 100644
--- a/specs/bellatrix/fork-choice.md
+++ b/specs/bellatrix/fork-choice.md
@@ -92,7 +92,7 @@ MUST be set to the hash of a terminal PoW block in this case.
 ##### `safe_block_hash`
 
 The `safe_block_hash` parameter MUST be set to return value of
-[`get_safe_execution_block_hash(store: Store)`](../../fork_choice/safe-block.md#get_safe_execution_block_hash)
+[`get_safe_execution_block_hash(fcr_store)`](./fast-confirmation.md#get_safe_execution_block_hash)
 function.
 
 ##### `should_override_forkchoice_update`
diff --git a/specs/gloas/fast-confirmation.md b/specs/gloas/fast-confirmation.md
new file mode 100644
index 00000000000..2c50b232b7d
--- /dev/null
+++ b/specs/gloas/fast-confirmation.md
@@ -0,0 +1,27 @@
+# Gloas -- Fast Confirmation
+
+<!-- mdformat-toc start --slug=github --no-anchors --maxlevel=6 --minlevel=2 -->
+
+- [Introduction](#introduction)
+- [Safe execution block](#safe-execution-block)
+  - [Modified `get_safe_execution_block_hash`](#modified-get_safe_execution_block_hash)
+
+<!-- mdformat-toc end -->
+
+## Introduction
+
+This is the modification of the fast confirmation rule specification
+accompanying Gloas.
+
+## Safe execution block
+
+### Modified `get_safe_execution_block_hash`
+
+*Note*: In Gloas, only the parent payload of a confirmed beacon block is safe.
+
+```python
+def get_safe_execution_block_hash(fcr_store: FastConfirmationStore) -> Hash32:
+    safe_block = fcr_store.store.blocks[fcr_store.confirmed_root]
+    # [Modified in Gloas:EIP7732]
+    return safe_block.body.signed_execution_payload_bid.message.parent_block_hash
+```
diff --git a/specs/gloas/fork-choice.md b/specs/gloas/fork-choice.md
index c419abfc69b..11e1b540b6a 100644
--- a/specs/gloas/fork-choice.md
+++ b/specs/gloas/fork-choice.md
@@ -91,13 +91,16 @@ computed as the following. All other semantics of `notify_forkchoice_updated`
 and its invocation are inherited from prior forks.
 
 - `finalized_block_hash = finalized_block_bid.parent_block_hash`,
-- `safe_block_hash = get_safe_execution_block_hash(store)`.
+- `safe_block_hash = get_safe_execution_block_hash(fcr_store)`.
 
 Where:
 
 - `finalized_block = store.blocks[store.finalized_checkpoint.root]`,
 - `finalized_block_bid = finalized_block.body.signed_execution_payload_bid.message`.
 
+*Note*: `get_safe_execution_block_hash` is modified in Gloas, see
+[Fast Confirmation](./fast-confirmation.md#get_safe_execution_block_hash).
+
 ## Helpers
 
 ### New `ForkChoiceNode`