---
title: getCurrentRefBlockParams
description: "Retrieves the reference block parameters (ref_block_bytes, ref_block_hash, expiration, timestamp) needed to build transactions."
keywords: ["getcurrentrefblockparams", "trx", "ref block", "transaction building", "blockheader"]
---
# getCurrentRefBlockParams <TitleWithCodeLink2 link="getCurrentRefBlockParams" />
Retrieve the parameters required for transaction building

## Usage
```js
tronWeb.trx.getCurrentRefBlockParams()
```

## Return
Object - with 4 properties that can be passed to transactionBuilder methods:
- ref_block_bytes
- ref_block_hash
- expiration
- timestamp

## Example
```js
await tronWeb.trx.getCurrentRefBlockParams();
// output-start
{
  ref_block_bytes: '0015',
  ref_block_hash: 'a7e9b8b30827c333',
  expiration: 1760932113000,
  timestamp: 1760932053000
}
// output-end
```