# UnsignedSeismicTx

All fields of a `TxSeismic` (type `0x4a`) transaction before signing.

## Definition

```python
@dataclass(frozen=True)
class UnsignedSeismicTx:
    chain_id: int
    nonce: int
    gas_price: int
    gas: int
    to: ChecksumAddress | None
    value: int
    data: HexBytes
    seismic: SeismicElements
```

## Fields

| Field       | Type                                                                                                              | Description                                        |
| ----------- | ----------------------------------------------------------------------------------------------------------------- | -------------------------------------------------- |
| `chain_id`  | `int`                                                                                                             | Numeric chain identifier                           |
| `nonce`     | `int`                                                                                                             | Sender's transaction count                         |
| `gas_price` | `int`                                                                                                             | Gas price in wei                                   |
| `gas`       | `int`                                                                                                             | Gas limit                                          |
| `to`        | `ChecksumAddress \| None`                                                                                         | Recipient address, or `None` for contract creation |
| `value`     | `int`                                                                                                             | Amount of wei to transfer                          |
| `data`      | `HexBytes`                                                                                                        | **Encrypted** calldata (ciphertext)                |
| `seismic`   | [`SeismicElements`](https://docs.seismic.systems/clients/python/api-reference/transaction-types/seismic-elements) | Seismic-specific encryption and expiry fields      |

## Example

```python
from seismic_web3 import sign_seismic_tx_eip712, PrivateKey

unsigned_tx = UnsignedSeismicTx(...)

signed_tx = sign_seismic_tx_eip712(unsigned_tx, PrivateKey(...))
tx_hash = w3.eth.send_raw_transaction(signed_tx)
```

## Notes

* The `data` field contains encrypted calldata — plaintext is not recoverable without the TEE's private key
* Created automatically by the SDK's write methods; visible in [`DebugWriteResult`](https://docs.seismic.systems/clients/python/api-reference/transaction-types/debug-write-result) for inspection
* Compatible with both raw signing (`message_version=0`) and EIP-712 (`message_version=2`)

## See Also

* [SeismicElements](https://docs.seismic.systems/clients/python/api-reference/transaction-types/seismic-elements) — Seismic-specific fields
* [sign\_seismic\_tx\_eip712](https://docs.seismic.systems/clients/python/api-reference/eip712/sign-seismic-tx-eip712) — sign this transaction
* [DebugWriteResult](https://docs.seismic.systems/clients/python/api-reference/transaction-types/debug-write-result) — contains UnsignedSeismicTx
* [build\_seismic\_typed\_data](https://docs.seismic.systems/clients/python/api-reference/eip712/build-seismic-typed-data) — convert to EIP-712 dict