> 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/intelligence-providers.md).

# Intelligence Providers

Manage viewing keys and decrypt SRC20 event data. Viewing keys are 32-byte AES-256 keys stored in the [Directory](/clients/python/abis/directory.md) genesis contract that allow holders to decrypt Transfer and Approval event amounts.

## Functions

| Function                                                                                                     | Returns             | Description                                     |
| ------------------------------------------------------------------------------------------------------------ | ------------------- | ----------------------------------------------- |
| [`register_viewing_key`](/clients/python/src20/intelligence-providers/register-viewing-key.md)               | `HexBytes`          | Register a viewing key (shielded write)         |
| [`get_viewing_key`](/clients/python/src20/intelligence-providers/get-viewing-key.md)                         | `Bytes32`           | Fetch your viewing key (signed read)            |
| [`check_has_key`](/clients/python/src20/intelligence-providers/check-has-key.md)                             | `bool`              | Check if address has a key (public)             |
| [`get_key_hash`](/clients/python/src20/intelligence-providers/check-has-key.md)                              | `bytes`             | Get `keccak256` hash of address's key (public)  |
| `compute_key_hash`                                                                                           | `bytes`             | Compute `keccak256(viewing_key)` locally (pure) |
| [`watch_src20_events_with_key`](/clients/python/src20/intelligence-providers/watch-src20-events-with-key.md) | `SRC20EventWatcher` | Watch events using an explicit viewing key      |

All functions except `compute_key_hash` have async variants prefixed with `async_`.

## Example

```python
import os
from seismic_web3 import PrivateKey, Bytes32, SEISMIC_TESTNET
from seismic_web3.src20 import register_viewing_key, get_viewing_key

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

# Register a viewing key
viewing_key = Bytes32(os.urandom(32))
tx_hash = register_viewing_key(w3, w3.seismic.encryption, pk, key=viewing_key)
w3.eth.wait_for_transaction_receipt(tx_hash)

# Fetch it back
fetched = get_viewing_key(w3, w3.seismic.encryption, pk)
assert fetched == viewing_key
```

## See Also

* [Event Watching](/clients/python/src20/event-watching.md) — Watch and decrypt SRC20 events
* [Types](/clients/python/src20/types.md) — Decrypted event data structures
* [Directory ABI](/clients/python/abis/directory.md) — Low-level ABI and contract address


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