chore: add osaka engine updates

docs/CHANGELOG.md

@@ -16,6 +16,8 @@ Test fixtures for use by clients are available for each release on the [Github r
 
 ### 📋 Misc
 
+- ✨ Engine API updates for Osaka, add `get_blobs` rpc method ([#1510](https://github.com/ethereum/execution-spec-tests/pull/1510)).
+
 ### 🧪 Test Cases
 
 ## [v4.4.0](https://github.com/ethereum/execution-spec-tests/releases/tag/v4.4.0) - 2025-04-29

src/ethereum_test_forks/forks/forks.py

@@ -1284,6 +1284,13 @@ def engine_forkchoice_updated_version(
 class Osaka(Prague, solc_name="cancun"):
     """Osaka fork."""
 
+    @classmethod
+    def engine_get_payload_version(
+        cls, block_number: int = 0, timestamp: int = 0
+    ) -> Optional[int]:
+        """From Osaka, get payload calls must use version 5."""
+        return 5
+
     @classmethod
     def evm_code_types(cls, block_number: int = 0, timestamp: int = 0) -> List[EVMCodeType]:
         """EOF V1 is supported starting from Osaka."""

src/ethereum_test_rpc/rpc.py

@@ -15,6 +15,7 @@
 from .types import (
     ForkchoiceState,
     ForkchoiceUpdateResponse,
+    GetBlobsResponse,
     GetPayloadResponse,
     JSONRPCError,
     PayloadAttributes,
@@ -344,3 +345,18 @@ def get_payload(
             ),
             context=self.response_validation_context,
         )
+
+    def get_blobs(
+        self,
+        params: List[Hash],
+        *,
+        version: int,
+    ) -> GetBlobsResponse:
+        """`engine_getBlobsVX`: Retrieves blobs from an execution layers tx pool."""
+        return GetBlobsResponse.model_validate(
+            self.post_request(
+                f"getBlobsV{version}",
+                *[to_json(param) for param in params],
+            ),
+            context=self.response_validation_context,
+        )

src/ethereum_test_rpc/types.py

@@ -136,9 +136,22 @@ def blob_versioned_hashes(self) -> List[Hash]:
         return [Hash(b"\1" + commitment[1:]) for commitment in self.commitments]
 
 
+class BlobAndProof(CamelModel):
+    """Represents a blob and proof structure."""
+
+    blob: Bytes
+    proofs: List[Bytes]
+
+
 class GetPayloadResponse(CamelModel):
     """Represents the response of a get payload request."""
 
     execution_payload: FixtureExecutionPayload
     blobs_bundle: BlobsBundle | None = None
     execution_requests: List[Bytes] | None = None
+
+
+class GetBlobsResponse(CamelModel):
+    """Represents the response of a get blobs request."""
+
+    result: List[BlobAndProof]