> 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/src20/types/decrypted-approval-log.md).

# DecryptedApprovalLog

Frozen dataclass representing a decoded SRC20 Approval event with decrypted amount.

## Solidity Event

```solidity
event Approval(
    address indexed owner,
    address indexed spender,
    bytes32 indexed encryptKeyHash,
    bytes encryptedAmount
)
```

## Definition

```python
@dataclass(frozen=True)
class DecryptedApprovalLog:
    owner: ChecksumAddress
    spender: ChecksumAddress
    encrypt_key_hash: bytes
    encrypted_amount: bytes
    decrypted_amount: int
    transaction_hash: HexBytes
    block_number: int
```

## Fields

| Field              | Type              | Description                        |
| ------------------ | ----------------- | ---------------------------------- |
| `owner`            | `ChecksumAddress` | Address granting the approval      |
| `spender`          | `ChecksumAddress` | Address receiving the approval     |
| `encrypt_key_hash` | `bytes`           | 32-byte `keccak256` of viewing key |
| `encrypted_amount` | `bytes`           | Raw AES-GCM ciphertext             |
| `decrypted_amount` | `int`             | Decrypted approval amount          |
| `transaction_hash` | `HexBytes`        | Transaction hash                   |
| `block_number`     | `int`             | Block number                       |

## Example

```python
from seismic_web3.src20 import DecryptedApprovalLog

def on_approval(log: DecryptedApprovalLog):
    print(f"Approval from {log.owner} to {log.spender}: {log.decrypted_amount}")
    print(f"Block {log.block_number}, tx {log.transaction_hash.hex()}")
```

## See Also

* [DecryptedTransferLog](/clients/python/src20/types/decrypted-transfer-log.md) — Transfer event data
* [Event Watching](/clients/python/src20/event-watching.md) — Watch and decrypt events


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