diff --git a/packages/testing/src/execution_testing/client_clis/cli_types.py b/packages/testing/src/execution_testing/client_clis/cli_types.py
index 333e1103582..0e76e5f0b44 100644
--- a/packages/testing/src/execution_testing/client_clis/cli_types.py
+++ b/packages/testing/src/execution_testing/client_clis/cli_types.py
@@ -288,6 +288,9 @@ class Result(CamelModel):
     requests: List[Bytes] | None = None
     block_access_list: BlockAccessList | None = None
     block_access_list_hash: Hash | None = None
+    slot_number: HexNumber | None = Field(
+        None, alias="currentSlotNumber"
+    )
     block_exception: Annotated[
         BlockExceptionWithMessage | UndefinedException | None,
         ExceptionMapperValidator,
diff --git a/packages/testing/src/execution_testing/fixtures/blockchain.py b/packages/testing/src/execution_testing/fixtures/blockchain.py
index 6b15039515a..4447c9bf19a 100644
--- a/packages/testing/src/execution_testing/fixtures/blockchain.py
+++ b/packages/testing/src/execution_testing/fixtures/blockchain.py
@@ -214,6 +214,9 @@ class FixtureHeader(CamelModel):
     block_access_list_hash: (
         Annotated[Hash, HeaderForkRequirement("bal_hash")] | None
     ) = Field(None, alias="blockAccessListHash")
+    slot_number: ZeroPaddedHexNumber | None = Field(
+        None, alias="slotNumber"
+    )
 
     fork: Fork | None = Field(None, exclude=True)
 
@@ -382,6 +385,13 @@ def genesis(cls, fork: Fork, env: Environment, state_root: Hash) -> Self:
                 if fork.header_bal_hash_required(block_number=0, timestamp=0)
                 else None
             ),
+            "slot_number": (
+                ZeroPaddedHexNumber(0)
+                if fork.header_slot_number_required(
+                    block_number=0, timestamp=0
+                )
+                else None
+            ),
             "fork": fork,
         }
         return cls(**environment_values, **extras)
@@ -422,6 +432,7 @@ class FixtureExecutionPayload(CamelModel):
     block_access_list: Bytes | None = Field(
         None, description="RLP-serialized EIP-7928 Block Access List"
     )
+    slot_number: HexNumber | None = Field(None)
 
     @classmethod
     def from_fixture_header(
diff --git a/packages/testing/src/execution_testing/forks/base_fork.py b/packages/testing/src/execution_testing/forks/base_fork.py
index 89fa18afc26..6bbfff2124b 100644
--- a/packages/testing/src/execution_testing/forks/base_fork.py
+++ b/packages/testing/src/execution_testing/forks/base_fork.py
@@ -361,6 +361,14 @@ def header_bal_hash_required(
         """Return true if the header must contain block access list hash."""
         pass
 
+    @classmethod
+    @abstractmethod
+    def header_slot_number_required(
+        cls, *, block_number: int = 0, timestamp: int = 0
+    ) -> bool:
+        """Return true if the header must contain slot_number (EIP-7843)."""
+        pass
+
     # Gas related abstract methods
 
     @classmethod
diff --git a/packages/testing/src/execution_testing/forks/forks/forks.py b/packages/testing/src/execution_testing/forks/forks/forks.py
index c2d219953f5..fee3045f5a8 100644
--- a/packages/testing/src/execution_testing/forks/forks/forks.py
+++ b/packages/testing/src/execution_testing/forks/forks/forks.py
@@ -976,6 +976,14 @@ def header_bal_hash_required(
         del block_number, timestamp
         return False
 
+    @classmethod
+    def header_slot_number_required(
+        cls, *, block_number: int = 0, timestamp: int = 0
+    ) -> bool:
+        """Pre-Amsterdam forks have no slot number in header."""
+        del block_number, timestamp
+        return False
+
     @classmethod
     def engine_new_payload_version(
         cls, *, block_number: int = 0, timestamp: int = 0
@@ -3360,6 +3368,14 @@ def header_bal_hash_required(
         del block_number, timestamp
         return True
 
+    @classmethod
+    def header_slot_number_required(
+        cls, *, block_number: int = 0, timestamp: int = 0
+    ) -> bool:
+        """Amsterdam requires slot_number in header (EIP-7843)."""
+        del block_number, timestamp
+        return True
+
     @classmethod
     def is_deployed(cls) -> bool:
         """Return True if this fork is deployed."""
diff --git a/src/ethereum/forks/amsterdam/blocks.py b/src/ethereum/forks/amsterdam/blocks.py
index ef44549d280..94e04b1bbe6 100644
--- a/src/ethereum/forks/amsterdam/blocks.py
+++ b/src/ethereum/forks/amsterdam/blocks.py
@@ -254,6 +254,14 @@ class Header:
     [cbalh]: ref:ethereum.forks.amsterdam.block_access_lists.rlp_utils.compute_block_access_list_hash
     """  # noqa: E501
 
+    slot_number: U64
+    """
+    The beacon chain slot number corresponding to this execution block.
+    Introduced in [EIP-7843].
+
+    [EIP-7843]: https://eips.ethereum.org/EIPS/eip-7843
+    """
+
 
 @slotted_freezable
 @dataclass
diff --git a/src/ethereum/genesis.py b/src/ethereum/genesis.py
index 444302ffebf..51525396c18 100644
--- a/src/ethereum/genesis.py
+++ b/src/ethereum/genesis.py
@@ -209,7 +209,7 @@ def add_genesis_block(
             chain.state,
             address,
             hardfork.Account(
-                Uint(int(account.get("nonce", "0"))),
+                hex_to_uint(account.get("nonce", "0x0")),
                 hex_or_base_10_str_to_u256(account.get("balance", 0)),
                 hex_to_bytes(account.get("code", "0x")),
             ),
@@ -257,11 +257,19 @@ def add_genesis_block(
         fields["parent_beacon_block_root"] = Hash32(b"\0" * 32)
 
     if has_field(hardfork.Header, "requests_hash"):
-        fields["requests_hash"] = Hash32(b"\0" * 32)
+        # SHA-256 of empty string per EIP-7685
+        fields["requests_hash"] = Hash32(
+            bytes.fromhex(
+                "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
+            )
+        )
 
     if has_field(hardfork.Header, "block_access_list_hash"):
         fields["block_access_list_hash"] = keccak256(rlp.encode([]))
 
+    if has_field(hardfork.Header, "slot_number"):
+        fields["slot_number"] = U64(0)
+
     genesis_header = hardfork.Header(**fields)
 
     block_fields = {
diff --git a/src/ethereum_spec_tools/evm_tools/t8n/env.py b/src/ethereum_spec_tools/evm_tools/t8n/env.py
index be719ba7af5..e025a0c14ae 100644
--- a/src/ethereum_spec_tools/evm_tools/t8n/env.py
+++ b/src/ethereum_spec_tools/evm_tools/t8n/env.py
@@ -11,6 +11,7 @@
 from ethereum_types.numeric import U64, U256, Uint
 
 from ethereum.crypto.hash import Hash32, keccak256
+from ethereum.utils import has_field
 from ethereum.utils.byte import left_pad_zero_bytes
 from ethereum.utils.hexadecimal import hex_to_bytes
 
@@ -148,6 +149,9 @@ def read_excess_blob_gas(self, data: Any, t8n: "T8N") -> None:
         if t8n.fork.has_block_access_list_hash:
             arguments["block_access_list_hash"] = Hash32(b"\0" * 32)
 
+        if has_field(t8n.fork.Header, "slot_number"):
+            arguments["slot_number"] = U64(0)
+
         parent_header = t8n.fork.Header(**arguments)
 
         self.excess_blob_gas = t8n.fork.calculate_excess_blob_gas(