---
title: "GetBeaconBlobSidecarsByBlockId"
method: GET
path: "/{apiKey}/eth/v1/beacon/blob_sidecars/{blockId}"
---

# GetBeaconBlobSidecarsByBlockId

`GET /{apiKey}/eth/v1/beacon/blob_sidecars/{blockId}`

Get blob sidecars.

Retrieves blob sidecars for a given block id.
Depending on `Accept` header it can be returned either as json or as bytes serialized by SSZ.

## Path parameters

- `apiKey` string, required — <style> .custom-style { color: #048FF4; } </style> For higher throughput, please <span class="custom-style"><a href="../docs/quick-start-guide#-creating-your-api-key-on-the-zan-platform" target="_blank">create your own API key</a></span>.
- `blockId` string, required

## Query parameters

- `indices` string[]

## Response `200`

Blob sidecars.

- object
  - `data` object[], required
    - `index` string, required
    - `blob` string, hex, required — A blob is `FIELD_ELEMENTS_PER_BLOB * size_of(BLSFieldElement) = 4096 * 32 = 131072` bytes (`DATA`) representing a SSZ-encoded Blob as defined in Deneb
    - `kzg_commitment` string, hex, required — A G1 curve point. Same as BLS standard "is valid pubkey" check but also allows `0x00..00` for point-at-infinity
    - `kzg_proof` string, hex, required — A G1 curve point. Used for verifying that the `KZGCommitment` for a given `Blob` is correct.
    - `signed_block_header` object, required — The [`SignedBeaconBlockHeader`](https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#signedbeaconblockheader) object envelope from the CL spec.
      - `message` object, required — The [`BeaconBlockHeader`](https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#beaconblockheader) object from the CL spec.
        - `slot` string, required — The slot to which this block corresponds.
        - `proposer_index` string, required — Index of validator in validator registry.
        - `parent_root` string, hex, required — The signing merkle root of the parent `BeaconBlock`.
        - `state_root` string, hex, required — The tree hash merkle root of the `BeaconState` for the `BeaconBlock`.
        - `body_root` string, hex, required — The tree hash merkle root of the `BeaconBlockBody` for the `BeaconBlock`
      - `signature` string, hex, required
    - `kzg_commitment_inclusion_proof` string[], required

---

[API](https://skmtc.net/zan/apis/zan-getnftmetadata.md) · [All operations](https://skmtc.net/zan/apis/zan-getnftmetadata/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/zan/zan-getnftmetadata/revisions/be8fa2338895/schema)