# NetworkIdentifier
The network_identifier specifies which network a particular object is associated with.
## Example Usage
```typescript
import { NetworkIdentifier } from "icpmcp-rosetta-api";
let value: NetworkIdentifier = {
blockchain: "bitcoin",
network: "mainnet",
subNetworkIdentifier: {
network: "shard 1",
metadata: {},
},
};
```
## Fields
| Field | Type | Required | Description | Example |
| --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `blockchain` | *string* | :heavy_check_mark: | N/A | bitcoin |
| `network` | *string* | :heavy_check_mark: | If a blockchain has a specific chain-id or network identifier, it should go in this field. It is up to the client to determine which network-specific identifier is mainnet or testnet. | mainnet |
| `subNetworkIdentifier` | [models.SubNetworkIdentifier](../models/subnetworkidentifier.md) | :heavy_minus_sign: | In blockchains with sharded state, the SubNetworkIdentifier is required to query some object on a specific shard. This identifier is optional for all non-sharded blockchains. | |
