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+# EIP-4844 Engine API extension
+
+This is an extension specific to EIP-4844 to the `core` methods as defined in the [Engine API](./specification.md).
+This extension is backwards-compatible, but not part of the initial Engine API.
+
+## Structures
+
+### BlobsBundleV1
+
+The fields are encoded as follows:
+
+- `blockHash`: `DATA`, 32 Bytes
+- `kzgs`: `Array of DATA` - Array of `KZGCommitment` as defined in [EIP-4844](https://eips.ethereum.org/EIPS/eip-4844), 48 bytes each (`DATA`).
+- `blobs`: `Array of DATA` - Array of blobs, each blob is `FIELD_ELEMENTS_PER_BLOB * size_of(BLSFieldElement) = 4096 * 32 = 131072` bytes (`DATA`) representing a SSZ-encoded `Blob` as defined in [EIP-4844](https://eips.ethereum.org/EIPS/eip-4844)
+
+## Methods
+
+### engine_getBlobsBundleV1
+
+This method retrieves the blobs and their respective KZG commitments corresponding to the `versioned_hashes`
+included in the blob transactions of the referenced execution payload.
+
+This method may be combined with `engine_getPayloadV1` into a `engine_getPayloadV2` in a later stage of EIP-4844.
+The separation of concerns aims to minimize changes during the testing phase of the EIP.
+
+#### Request
+
+* method: `engine_getBlobsBundleV1`
+* params:
+  1. `payloadId`: `DATA`, 8 Bytes - Identifier of the payload build process
+
+#### Response
+
+* result: [`BlobsBundleV1`](#BlobsBundleV1)
+* error: code and message set in case an exception happens while getting the blobs bundle.
+
+#### Specification
+
+1. Given the `payloadId` client software **MUST** return the blobs bundle corresponding to the most recent version of the payload that was served with `engine_getPayload`, if any,
+   and halt any further changes to the payload. The `engine_getBlobsBundleV1` and `engine_getPayloadV1` results **MUST** be consistent as outlined in items 3, 4 and 5 below. 
+
+2. The call **MUST** return `-32001: Unknown payload` error if the build process identified by the `payloadId` does not exist. Note that a payload without any blobs **MUST** return an empty `blobs` and `kzgs` list, not an error.
+
+3. The call **MUST** return `kzgs` matching the versioned hashes of the transactions list of the execution payload, 
+   i.e. `assert verify_kzgs_against_transactions(payload.transactions, bundle.kzgs)` (see EIP-4844 consensus-specs).
+
+4. The call **MUST** return `blobs` that match the `kzgs` list, i.e. `assert len(kzgs) == len(blobs) and all(blob_to_kzg(blob) == kzg for kzg, blob in zip(bundle.kzgs, bundle.blobs))`
+
+5. The call **MUST** return `blockHash` to reference the `blockHash` of the corresponding execution payload, intended for the caller to sanity-check the consistency with the `engine_getPayload` call.