> For the complete documentation index, see [llms.txt](https://docs.seismic.systems/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.seismic.systems/clients/python/api-reference/transaction-types/unsigned-seismic-tx.md).

# UnsignedSeismicTx

Complete unsigned Seismic transaction

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
    authorization_list: list[SignedAuthorization] = field(default_factory=list)
    gas_payment: GasPayment = field(default_factory=GasPayment.auto)
```

## 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                                                                                          |
| `gas_payment`        | [`GasPayment`](/clients/python/api-reference/transaction-types/gas-payment.md)           | Resolved public signed selection; defaults to Auto during construction, always present on the wire |
| `authorization_list` | `list[SignedAuthorization]`                                                              | Authorization tuples, default empty; committed by the EIP-712 hash                                 |
| `to`                 | `ChecksumAddress \| None`                                                                | Recipient address, or `None` for contract creation                                                 |
| `value`              | `int`                                                                                    | Amount of wei to transfer                                                                          |
| `data`               | `HexBytes`                                                                               | **Encrypted** calldata (ciphertext)                                                                |
| `seismic`            | [`SeismicElements`](/clients/python/api-reference/transaction-types/seismic-elements.md) | 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`](/clients/python/api-reference/transaction-types/debug-write-result.md) for inspection
* Compatible with both raw signing (`message_version=0`) and EIP-712 (`message_version=2`)

## See Also

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


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