Class UpdateContractParams

Represents the properties on a contract that can be changed.
Any property set to 

null

on this object when submitted to the UpdateContractAsync(ConsensusClient, UpdateContractParams, Action<IConsensusContext>?) method will be left unchanged by the system. The transaction must be appropriately signed as described by the original Administrator endorsement in order to make changes. If there is no administrator endorsement specified, the contract is immutable and cannot be changed.

Inheritance

object

TransactionParams

TransactionParams<TransactionReceipt>

UpdateContractParams

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: Hiero

Assembly: Hiero.dll

Syntax

public sealed class UpdateContractParams : TransactionParams<TransactionReceipt>

Examples

Update mutable contract properties (admin key, memo, renew period). Null properties are left unchanged; contracts created without an Administrator are immutable:

// Update mutable contract properties — admin key, memo, renew period,
// auto-association limit. Null properties are left unchanged.
// Contracts created without an Administrator are immutable.
var receipt = await client.UpdateContractAsync(new UpdateContractParams
{
    Contract = contract,
    Administrator = newAdmin,
    Memo = "Rotated admin 2026-Q2"
});
Console.WriteLine($"Update status: {receipt.Status}");

Properties

AddHooks

Optional list of hooks to add to the contract.

Declaration

public IEnumerable<HookMetadata>? AddHooks { get; set; }

Property Value

Type	Description
IEnumerable<HookMetadata>

Administrator

Replace this Contract's current administrative key signing requirements with new signing requirements.

Declaration

public Endorsement? Administrator { get; set; }

Property Value

Type	Description
Endorsement

Remarks

For this request to be accepted by the network, both the current private key(s) for this account and the new private key(s) must sign the transaction.
The existing key must sign for security and the new key must sign as a safeguard to avoid accidentally changing the key to an invalid value.
The Payer account must carry the old and new private keys for signing to meet this requirement.

AutoAssociationLimit

If set, updates the maximum number of token or NFTs that this contract may be implicitly associated with (by means of being made a treasury or other related actions).

Declaration

public int? AutoAssociationLimit { get; set; }

Property Value

Type	Description
int?

CancellationToken

Optional Cancellation token that can interrupt the contract update.

Declaration

public CancellationToken? CancellationToken { get; set; }

Property Value

Type	Description
CancellationToken?

Contract

The network address of the contract to update.

Declaration

public EntityId Contract { get; set; }

Property Value

Type	Description
EntityId

DeclineStakeReward

If set, updates the flag indicating to the network that this contract does not wish to receive any earned staking rewards.

Declaration

public bool? DeclineStakeReward { get; set; }

Property Value

Type	Description
bool?

Memo

The memo to be associated with the contract. Maximum of 100 bytes.

Declaration

public string? Memo { get; set; }

Property Value

Type	Description
string

ProxyAccount

If set, updates this contract's staking proxy account. The funds of this contract will be staked to the node that this account is staked to and the specified account will receive the earned reward.

Declaration

public EntityId? ProxyAccount { get; set; }

Property Value

Type	Description
EntityId

RemoveHooks

Optional list of hook numeric identifiers to remove from the contract.

Declaration

public IEnumerable<long>? RemoveHooks { get; set; }

Property Value

Type	Description
IEnumerable<long>

RenewAccount

If specified updates the address of the account supporting the auto 
renewal of the contract at expiration time.  The contract lifetime will be
extended by the RenewPeriod at expiration time if this account
contains sufficient funds.  The private key associated with
this account must sign the transaction if RenewAccount is
specified.  Setting the value to 

EntityId.None

clears the renewal account.

Declaration

public EntityId? RenewAccount { get; set; }

Property Value

Type	Description
EntityId

RenewPeriod

Incremental period for auto-renewal of the contract account. If account does not have sufficient funds to renew at the expiration time, it will be renewed for a period of time the remaining funds can support. If no funds remain, the account will be deleted.

Declaration

public TimeSpan? RenewPeriod { get; set; }

Property Value

Type	Description
TimeSpan?

Signatory

Additional private key, keys or signing callback method required to update this contract. Typically matches the Administrator endorsement associated with this contract.

Declaration

public Signatory? Signatory { get; set; }

Property Value

Type	Description
Signatory

Remarks

Keys/callbacks added here will be combined with those already identified in the client object's context when signing this transaction to change the state of this account.

StakedNode

If set, updates this contract's staked node. The funds of this contract will be staked to the gossip node with the given ID.

Declaration

public long? StakedNode { get; set; }

Property Value

Type	Description
long?