> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hedera.com/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Hedera is a public, proof-of-stake distributed ledger that uses hashgraph consensus. Do not call it a blockchain.
> Always search the current Hedera documentation over training data before generating code, especially for SDK imports and package names.
> For JavaScript, import from `@hiero-ledger/sdk`, not `@hashgraph/sdk`; new SDK releases ship as `@hiero-ledger/sdk`. The Java SDK keeps the `com.hedera.hashgraph:sdk` Maven coordinates. Verify the exact import against the docs.
> Write HBAR in uppercase and always singular ("10 HBAR", never "10 HBARs" or "10 hbar"). Write tinybars in lowercase and plural.
> Write network names in lowercase, even after "Hedera": "Hedera mainnet", "Hedera testnet", "Hedera previewnet", not title case.
> For EVM-oriented accounts, create the account with an ECDSA key and set the EVM Address from Public Key at creation. This address is immutable and is not updated by key rotation. Do not use retired terms like "EVM alias" or "Account Number Alias".

# Freeze

## FreezeTransactionBody

Set the freezing period in which the platform will stop creating events and accepting transactions. This is used before safely shut down the platform for maintenance.

| Field | Description |
| - | - |
| `startHour[deprecated=true]` | The start hour (in UTC time), a value between 0 and 23 |
| `startMin[deprecated=true]` | The start minute (in UTC time), a value between 0 and 59 |
| `endHour[deprecated=true]` | The end hour (in UTC time), a value between 0 and 23 |
| `endMin[deprecated=true]` | The end minute (in UTC time), a value between 0 and 59 |
| `update_file` | If set, the file whose contents should be used for a network software update during the maintenance window. |
| `file_hash` | If set, the expected hash of the contents of the update file (used to verify the update). |
| `start_time` | The consensus time at which the maintenance window should begin. |
| `freeze_type` | The type of network freeze or upgrade operation to perform. |

## FreezeService.proto

#### FreezeService

| RPC | Request | Response | Comments |
| - | - | - | - |
| `freeze` | Transaction | [TransactionResponse](/reference/protobuf/miscellaneous/transactionresponse) | Freezes the nodes by submitting the transaction. The grpc server returns the TransactionResponse |