Update a topic

A transaction that updates the properties of an existing topic. This includes the topic memo, admin key, submit key, auto renew account, and auto renew period. 
Topic Properties
Field
Description
Topic ID
Update the topic ID
Admin Key
Set a new admin key that authorizes update topic and delete topic transactions. 
Submit Key
Set a new submit key for a topic that authorizes sending messages to this topic. 
Topic Memo
Set a new short publicly visible memo on the new topic and is stored with the topic. (100 bytes)
Auto Renew Account
Set a new auto renew account ID for this topic (once autoRenew functionality is supported by HAPI).
Auto Renew Period
Set a new auto renew period for this topic (once autoRenew functionality is supported by HAPI).
Transaction Signing Requirements
If an adminKey is updated, the transaction must be signed by the pre-update adminKey and post-update adminKey.
If the adminKey was set during the creation of the topic, the admin key must sign the transaction to update any of the topic's properties 
If no adminKey was defined during the creation of the topic, you can only extend the expirationTime.
V2
V1
V2
Constructor
Description
new TopicUpdateTransaction()
Initializes the TopicUpdateTransaction object
new TopicUpdateTransaction()
Methods
Method
Type
Requirements
setAdminKey(<adminKey>)
Key
Optional
setSubmitKey(<submitKey>)
Key
Optional
setExpirationTime(<expirationTime>)
Instant
Optional
setTopicMemo(<memo>)
String
Optional
setAutoRenewAccountId(<accountId>)
AccountId
Optional
setAutoRenewPeriod(<autoRenewAccountId>)
Duration
Optional
clearAdminKey()
​
Optional
clearSubmitKey()
​
Optional
clearTopicMemo()
​
Optional
clearAutoRenewAccountId()
​
Optional
Java
 //Create a transaction to add a submit key
TopicUpdateTransaction transaction = new TopicUpdateTransaction()
    .setSubmitKey(submitKey);
​
//Sign the transaction with the admin key to authorize the update
TopicUpdateTransaction signTx = transaction.freezeWith(client).sign(adminKey);
​
//Sign the transaction with the client operator, submit to a Hedera network, get the transaction ID
TransactionResponse txResponse = signTx.execute(client);
​
//Request the receipt of the transaction
TransactionReceipt receipt = txResponse.getReceipt(client);
​
//Get the transaction consensus status
Status transactionStatus = receipt.status;
​
System.out.println("The transaction consensus status is " +transactionStatus);
​
//v2.0.0
JavaScript
//Create a transaction to add a submit key
const transaction = await new TopicUpdateTransaction()
    .setSubmitKey(submitKey
    .freezeWith(client);
​
//Sign the transaction with the admin key to authorize the update
const signTx = await transaction.sign(adminKey);
    
//Sign with the client operator private key and submit to a Hedera network
const txResponse = await signTx.execute(client);
​
//Request the receipt of the transaction
const receipt = await txResponse.getReceipt(client);
​
//Get the transaction consensus status
const transactionStatus = receipt.status;
​
console.log("The transaction consensus status is " +transactionStatus);
​
//v2.0.0
Go
//Create the transaction
transaction := hedera.NewTopicUpdateTransaction()
    SetTopicMemo("new memo)
​
//Sign with the client operator private key and submit the transaction to a Hedera network
txResponse, err := transaction.FreezeWith(client).Sign(adminkey)Execute(client)
​
if err != nil {
		panic(err)
}
​
//Request the receipt of the transaction
receipt, err := txResponse.GetReceipt(client)
​
if err != nil {
		panic(err)
}
​
//Get the transaction consensus status
transactionStatus := receipt.Status
​
fmt.Printf("The transaction consensus status is %v\n", transactionStatus)
//v2.0.0
V1
Constructor
Description
new ConsensusTopicUpdateTransaction()
Initializes the ConsensusTopicUpdateTransaction object
new ConsensusTopicUpdateTransaction()
Methods
Method
Type
Requirements
setTopicId(<topicId>)
TopicId
Required
setAdminKey(<adminKey>)
Key
Optional
setSubmitKey(<submitKey>)
Key
Optional
setExpirationTime(<expirationTime>)
Instant
Optional
setTopicMemo(<memo>)
String
Optional
setAutoRenewAccountId(<accountId>)
AccountId
Optional
setAutoRenewPeriod(<autoRenewAccountId>)
Duration
Optional
clearAdminKey()
​
Optional
clearSubmitKey()
​
Optional
clearTopicMemo()
​
Optional
clearAutoRenewAccountId()
​
Optional
Java
//Create a transaction to add a submit key
ConsensusTopicUpdateTransaction transaction = new ConsensusTopicUpdateTransaction()
    .setSubmitKey(submitKey);
​
//Sign the transaction with the admin key to authorize the update
ConsensusTopicUpdateTransaction signTx = transaction.build(client).sign(adminKey);
​
//Sign the transaction with the client operator, submit to a Hedera network, get the transaction ID
TransactionId txId = signTx.execute(client);
​
//Request the receipt of the transaction
TransactionReceipt receipt = txId.getReceipt(client);
​
//Get the transaction consensus status
Status transactionStatus = receipt.status;
​
System.out.println("The transaction consensus status is " +transactionStatus);
​
//v1.3.2
JavaScript
//Create a transaction to add a submit key
const transaction = await new ConsensusTopicUpdateTransaction()
    .setSubmitKey(submitKey)
    .build(client);
​
//Sign the transaction with the admin key to authorize the update
const signTx = await transaction.sign(adminKey);
​
//Sign the transaction with the client operator, submit to a Hedera network, get the transaction ID
const txId = await signTx.execute(client);
​
//Request the receipt of the transaction
const receipt = await txId.getReceipt(client);
​
//Get the transaction consensus status
const transactionStatus = receipt.status;
​
console.log("The transaction consensus status is " +transactionStatus);
​
//v1.4.4
Get transaction values
V2
V2
Method
Type
Requirements
getTopicId()
TopicId
Optional
getAdminKey()
Key
Optional
getSubmitKey()
Key
Optional
getTopicMemo()
String
Optional
getAutoRenewAccountId()
AccountId
Disabled
getAutoRenewPeriod()
Duration
Disabled
Java
 //Create a transaction to add a submit key
TopicUpdateTransaction transaction = new TopicUpdateTransaction()
    .setSubmitKey(submitKey);
​
//Get submit key
transaction.getSubmitKey()
​
//v2.0.0
JavaScript
 //Create a transaction to add a submit key
const transaction = new TopicUpdateTransaction()
    .setSubmitKey(submitKey);
​
//Get submit key
transaction.getSubmitKey()
​
//v2.0.0
Go
//Create the transaction
transaction := hedera.NewTopicUpdateTransaction()
    SetSubmitKey()
​
transaction := transaction.GetSubmitKey()
​
//v2.0.0
​

Create a topic

Submit a message

Last updated 5 months ago

Field	Description
Topic ID	Update the topic ID
Admin Key	Set a new admin key that authorizes update topic and delete topic transactions.
Submit Key	Set a new submit key for a topic that authorizes sending messages to this topic.
Topic Memo	Set a new short publicly visible memo on the new topic and is stored with the topic. (100 bytes)
Auto Renew Account	Set a new auto renew account ID for this topic (once autoRenew functionality is supported by HAPI).
Auto Renew Period	Set a new auto renew period for this topic (once autoRenew functionality is supported by HAPI).

Constructor	Description
`new TopicUpdateTransaction()`	Initializes the TopicUpdateTransaction object

Method	Type	Requirements
`setAdminKey(<adminKey>)`	Key	Optional
`setSubmitKey(<submitKey>)`	Key	Optional
`setExpirationTime(<expirationTime>)`	Instant	Optional
`setTopicMemo(<memo>)`	String	Optional
`setAutoRenewAccountId(<accountId>)`	AccountId	Optional
`setAutoRenewPeriod(<autoRenewAccountId>)`	Duration	Optional
`clearAdminKey()`		Optional
`clearSubmitKey()`		Optional
`clearTopicMemo()`		Optional
`clearAutoRenewAccountId()`		Optional

Constructor	Description
`new ConsensusTopicUpdateTransaction()`	Initializes the ConsensusTopicUpdateTransaction object

Update a topic

Topic Properties

Methods

Methods

Get transaction values

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