# setDefaultBlock

Sets the default block used as a reference for tronWeb.trx.getBlock, tronWeb.trx.getBlockTransactionCount, tronWeb.trx.getTransactionFromBlock

## Usage

```JavaScript
TronWeb.setDefaultBlock(blockID);
```

## Parameter

| Parameter | Description                                                                                                                                                       | Data Type       |
| --------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------- |
| blockID   | Possible input values can be `latest`, `earliest`, left blank or block number. <br/> `latest`:	The reference block is the latest block <br/> `earliest`: The reference block is the genesis block <br/> left blank:	No reference block <br/> block number:	The reference block is the corresponding block | Number / String |

## Returns

String

## Example

```JavaScript
>tronWeb.setDefaultBlock('latest');
'latest'

> tronWeb.setDefaultBlock();
false

> tronWeb.setDefaultBlock('earliest');
'Earliest'

> tronWeb.setDefaultBlock(585367);
undefined
```