> 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/signature.md).

# Signature

ECDSA signature components

ECDSA signature components for signed Seismic transactions.

## Definition

```python
@dataclass(frozen=True)
class Signature:
    v: int
    r: int
    s: int
```

## Fields

| Field | Type  | Description                             |
| ----- | ----- | --------------------------------------- |
| `v`   | `int` | Recovery identifier (0 or 1, y-parity)  |
| `r`   | `int` | First 32-byte integer of the signature  |
| `s`   | `int` | Second 32-byte integer of the signature |

## Example

```python
from eth_keys import keys as eth_keys
from seismic_web3 import Signature, PrivateKey

sk = eth_keys.PrivateKey(bytes(PrivateKey(...)))
sig_obj = sk.sign_msg_hash(b"\xab" * 32)

sig = Signature(v=sig_obj.v, r=sig_obj.r, s=sig_obj.s)
```

## Notes

* `v` is 0 or 1 (EIP-155 y-parity), not the legacy 27/28 values
* Typically created internally by signing functions — most users won't construct this directly

## See Also

* [sign\_seismic\_tx\_eip712](/clients/python/api-reference/eip712/sign-seismic-tx-eip712.md) — creates and applies signature
* [UnsignedSeismicTx](/clients/python/api-reference/transaction-types/unsigned-seismic-tx.md) — transaction before signing
* [PrivateKey](/clients/python/api-reference/types/private-key.md) — used to generate signatures


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