# Bytes32

Exactly 32 bytes — used for hashes, AES keys, and similar values.

## Definition

```python
class Bytes32(_SizedHexBytes):
    _size = 32
```

## Construction

| Parameter | Type                  | Required | Description                       |
| --------- | --------------------- | -------- | --------------------------------- |
| `val`     | `bytes \| str \| int` | Yes      | Hex string, raw bytes, or integer |

Raises `ValueError` if length is not exactly 32 bytes.

## Example

```python
from seismic_web3 import Bytes32

block_hash = Bytes32("0x" + "ab" * 32)
print(len(block_hash))        # 32
print(block_hash.to_0x_hex())
```

## Key properties

* Inherits from `HexBytes` — passes `isinstance(x, bytes)` checks
* Immutable and hashable
* Has `.to_0x_hex()` method for `"0x"`-prefixed hex output

## See Also

* [PrivateKey](/clients/python/api-reference/types/private-key.md) — 32-byte subclass for signing keys
* [CompressedPublicKey](/clients/python/api-reference/types/compressed-public-key.md) — 33-byte public key
* [EncryptionNonce](/clients/python/api-reference/types/encryption-nonce.md) — 12-byte nonce


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