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## `blobhashes`

### Signature

```solidity
function blobhashes(bytes32[] calldata hashes) external;
```

### Description

Sets the blob versioned hashes ([EIP-4844](https://eips.ethereum.org/EIPS/eip-4844)) of the current transaction. After this call, the `BLOBHASH` opcode (`blobhash(i)` in Solidity) returns `hashes[i]`, and `bytes32(0)` for any index out of range.

### Parameters

| Parameter | Type        | Description                                  |
|-----------|-------------|----------------------------------------------|
| `hashes`  | `bytes32[]` | The blob versioned hashes to set             |

### Examples

```solidity [test/Blobhashes.t.sol]
// [!include ~/snippets/projects/blob_cheatcodes/test/Blobhashes.t.sol]
```

```bash
$ forge test --root src/snippets/projects/blob_cheatcodes --match-contract BlobhashesTest
```

### Gotchas

:::warning
This cheatcode is only available on EVM versions Cancun and later. On earlier EVM versions it reverts with `` `blobhashes` is not supported before the Cancun hard fork ``. Set `evm_version = "cancun"` (or later) in `foundry.toml`, or pass `--evm-version cancun`.
:::

### Related Cheatcodes

* [`getBlobhashes`](/reference/cheatcodes/get-blobhashes) - Gets the blob versioned hashes of the current transaction
* [`blobBaseFee`](/reference/cheatcodes/blob-base-fee) - Sets `block.blobbasefee`