# Deposit Contract

ABI and address for Seismic's Eth2-style validator deposit contract at `0x00000000219ab540356cBB839Cbe05303d7705Fa`. Validators deposit ETH along with their public keys, signatures, and withdrawal credentials.

## Constants

```python
from seismic_web3 import DEPOSIT_CONTRACT_ABI, DEPOSIT_CONTRACT_ADDRESS

DEPOSIT_CONTRACT_ADDRESS: str = "0x00000000219ab540356cBB839Cbe05303d7705Fa"
DEPOSIT_CONTRACT_ABI: list[dict[str, Any]]
```

## Functions

| Function            | Parameters                                                                                                                | Returns   | Mutability | Description                       |
| ------------------- | ------------------------------------------------------------------------------------------------------------------------- | --------- | ---------- | --------------------------------- |
| `deposit`           | `node_pubkey`, `consensus_pubkey`, `withdrawal_credentials`, `node_signature`, `consensus_signature`, `deposit_data_root` | —         | `payable`  | Deposit ETH to become a validator |
| `get_deposit_count` | —                                                                                                                         | `bytes`   | `view`     | Total number of deposits          |
| `get_deposit_root`  | —                                                                                                                         | `bytes32` | `view`     | Merkle root of all deposits       |
| `supportsInterface` | `interfaceId: bytes4`                                                                                                     | `bool`    | `pure`     | ERC-165 interface check           |

## Events

| Event          | Parameters                                                                                                              | Description                   |
| -------------- | ----------------------------------------------------------------------------------------------------------------------- | ----------------------------- |
| `DepositEvent` | `node_pubkey`, `consensus_pubkey`, `withdrawal_credentials`, `amount`, `node_signature`, `consensus_signature`, `index` | Emitted on successful deposit |

## Deposit Requirements

| Requirement              | Details                                                                                                                      |
| ------------------------ | ---------------------------------------------------------------------------------------------------------------------------- |
| Minimum deposit          | 1 ETH (standard validator: 32 ETH)                                                                                           |
| `node_pubkey`            | 32-byte ED25519 public key                                                                                                   |
| `consensus_pubkey`       | 48-byte BLS12-381 public key                                                                                                 |
| `withdrawal_credentials` | 32 bytes — use [`make_withdrawal_credentials`](https://docs.seismic.systems/clients/python/abis/make-withdrawal-credentials) |
| `node_signature`         | 64-byte ED25519 signature                                                                                                    |
| `consensus_signature`    | 96-byte BLS12-381 signature                                                                                                  |
| `deposit_data_root`      | 32 bytes — use [`compute_deposit_data_root`](https://docs.seismic.systems/clients/python/abis/compute-deposit-data-root)     |
| Transaction value        | Must match `amount_gwei * 10**9` in wei                                                                                      |

## Example

```python
import os
from seismic_web3 import PrivateKey, SEISMIC_TESTNET

pk = PrivateKey.from_hex_str(os.environ["PRIVATE_KEY"])
w3 = SEISMIC_TESTNET.wallet_client(pk)

# Query deposit state via namespace methods
count = w3.seismic.get_deposit_count()
root = w3.seismic.get_deposit_root()
```

## See Also

* [compute\_deposit\_data\_root](https://docs.seismic.systems/clients/python/abis/compute-deposit-data-root) — Compute the SSZ hash tree root
* [make\_withdrawal\_credentials](https://docs.seismic.systems/clients/python/abis/make-withdrawal-credentials) — Build ETH1 withdrawal credentials
* [deposit](https://docs.seismic.systems/clients/python/namespaces/methods/deposit) — Namespace method for making deposits