> ## Documentation Index
> Fetch the complete documentation index at: https://hedera-0c6e0218-feat-317-axelar-integration.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# ConsensusTopicInfo

| Field | Type | Description |
| - | - | - |
| `memo` | ​ | Short publicly visible memo about the topic. No guarantee of uniqueness. |
| `runningHash` | ​ | <p>When a topic is created, its running hash is initialized to 48 bytes of binary zeros. For each submitted message, the topic’s running hash is then updated to the output of a particular SHA-384 digest whose input data include the previous running hash.<br /><br />See the TransactionReceipt.proto documentation for an exact description of the data included in the SHA-384 digest used for the update.</p> |
| `sequenceNumber` | | Sequence number (starting at 1 for the first submitMessage) of messages on the topic. |
| `expirationTime` | ​[Timestamp](/hedera/sdks-and-apis/hedera-api/miscellaneous/timestamp)​ | Effective consensus timestamp at (and after) which submitMessage calls will no longer succeed on the topic and the topic will expire and after AUTORENEW\_GRACE\_PERIOD be automatically deleted. |
| `adminKey` | ​[Key](/hedera/sdks-and-apis/hedera-api/basic-types/key)​ | Access control for update/delete of the topic. Null if there is no key. |
| `submitKey` | ​[Key](/hedera/sdks-and-apis/hedera-api/basic-types/key)​ | Access control for ConsensusService.submitMessage. Null if there is no key. |
| `autoRenewPeriod` | ​[Duration](/hedera/sdks-and-apis/hedera-api/miscellaneous/duration)​ | The duration in which to renew the topic |
| `autoRenewAccount` | ​[AccountID](/hedera/sdks-and-apis/hedera-api/basic-types/accountid)​ | Null if there is no autoRenewAccount. |
| `ledger_id` | bytes | The ledger ID the response was returned from; please see [HIP-198](https://github.com/hashgraph/hedera-improvement-proposal/blob/master/HIP/hip-198.md) for the network-specific IDs. |