Add back proofVersion

src/engine/osaka.md

@@ -9,6 +9,7 @@ This specification is based on and extends [Engine API - Prague](./prague.md) sp
 **Table of Contents**
 
 - [Structures](#structures)
+  - [ExecutionPayloadV4](#executionpayloadv4)
   - [BlobsBundleV2](#blobsbundlev2)
   - [BlobAndProofV2](#blobandproofv2)
 - [Methods](#methods)
@@ -25,6 +26,34 @@ This specification is based on and extends [Engine API - Prague](./prague.md) sp
 
 ## Structures
 
+### ExecutionPayloadV4
+
+This structure has the syntax of [`ExecutionPayloadV3`](./cancun.md#executionpayloadv3) and appends the new field `proofVersion`.
+
+- `parentHash`: `DATA`, 32 Bytes
+- `feeRecipient`:  `DATA`, 20 Bytes
+- `stateRoot`: `DATA`, 32 Bytes
+- `receiptsRoot`: `DATA`, 32 Bytes
+- `logsBloom`: `DATA`, 256 Bytes
+- `prevRandao`: `DATA`, 32 Bytes
+- `blockNumber`: `QUANTITY`, 64 Bits
+- `gasLimit`: `QUANTITY`, 64 Bits
+- `gasUsed`: `QUANTITY`, 64 Bits
+- `timestamp`: `QUANTITY`, 64 Bits
+- `extraData`: `DATA`, 0 to 32 Bytes
+- `baseFeePerGas`: `QUANTITY`, 256 Bits
+- `blockHash`: `DATA`, 32 Bytes
+- `transactions`: `Array of DATA` - Array of transaction objects, each object is a byte list (`DATA`) representing `TransactionType || TransactionPayload` or `LegacyTransaction` as defined in [EIP-2718](https://eips.ethereum.org/EIPS/eip-2718)
+- `withdrawals`: `Array of WithdrawalV1` - Array of withdrawals, each object is an `OBJECT` containing the fields of a `WithdrawalV1` structure.
+- `blobGasUsed`: `QUANTITY`, 64 Bits
+- `excessBlobGas`: `QUANTITY`, 64 Bits
+- `proofVersion`: `QUANTITY`, 8 Bits
+
+Currently `proofVersion` supports two types:
+
+- `0`: original type, blob proofs
+- `1`: new type after EIP-7594, cell proofs
+
 ### BlobsBundleV2
 
 The fields are encoded as follows:
@@ -60,7 +89,7 @@ This method is updated in a backward incompatible way. Instead of returning `Blo
 #### Response
 
 * result: `object`
-  - `executionPayload`: [`ExecutionPayloadV3`](./cancun.md#executionpayloadv3)
+  - `executionPayload`: [`ExecutionPayloadV4`](#executionpayloadv4)
   - `blockValue` : `QUANTITY`, 256 Bits - The expected value to be received by the `feeRecipient` in wei
   - `blobsBundle`: [`BlobsBundleV2`](#BlobsBundleV2) - Bundle with data corresponding to blob transactions included into `executionPayload`
   - `shouldOverrideBuilder` : `BOOLEAN` - Suggestion from the execution layer to use this `executionPayload` instead of an externally provided one