> 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

Decoded SRC20 Approval event with decrypted amount

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


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.seismic.systems/clients/python/src20/types/decrypted-approval-log.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.