getRecentBlockhash

Deprecated: This method is deprecated. Use getLatestBlockhash instead.

Returns a recent blockhash from the ledger and a fee schedule that can be used to compute the cost of submitting a transaction. This method has been deprecated in favor of getLatestBlockhash, which provides the same blockhash along with a lastValidBlockHeight for more reliable transaction expiration handling. All new applications should use getLatestBlockhash instead.

Parameters

#TypeRequiredDescription
1objectNoConfiguration object

Configuration object fields:

FieldTypeDescription
commitmentstringCommitment level: processed, confirmed, or finalized

Response

Returns an RpcResponse object:

FieldTypeDescription
context.slotu64The slot at which the value was read
value.blockhashstringA recent blockhash (base-58)
value.feeCalculator.lamportsPerSignatureu64Fee per signature in lamports

Code Examples

cURL

1curl http://[IP_ADDRESS]:[PORT] -X POST -H "Content-Type: application/json" -d '{
2  "jsonrpc": "2.0",
3  "id": 1,
4  "method": "getRecentBlockhash",
5  "params": []
6}'

TypeScript

1const response = await fetch("http://[IP_ADDRESS]:[PORT]", {
2  method: "POST",
3  headers: { "Content-Type": "application/json" },
4  body: JSON.stringify({
5    jsonrpc: "2.0",
6    id: 1,
7    method: "getRecentBlockhash",
8    params: []
9  }),
10});
11const { result } = await response.json();
12console.log("Blockhash:", result.value.blockhash);

Python

1import requests
2
3response = requests.post("http://[IP_ADDRESS]:[PORT]", json={
4    "jsonrpc": "2.0",
5    "id": 1,
6    "method": "getRecentBlockhash",
7    "params": []
8})
9result = response.json()["result"]
10print(f"Blockhash: {result['value']['blockhash']}")

Rust

1use reqwest::Client;
2use serde_json::json;
3
4#[tokio::main]
5async fn main() -> Result<(), Box<dyn std::error::Error>> {
6    let client = Client::new();
7    let res = client.post("http://[IP_ADDRESS]:[PORT]")
8        .json(&json!({
9            "jsonrpc": "2.0",
10            "id": 1,
11            "method": "getRecentBlockhash",
12            "params": []
13        }))
14        .send().await?
15        .text().await?;
16    println!("{}", res);
17    Ok(())
18}

Example Response

1{
2  "jsonrpc": "2.0",
3  "result": {
4    "context": { "slot": 123456789 },
5    "value": {
6      "blockhash": "GJxqhuxcgfn5Tcj6y3f8X4FeCDd2RQ6SnEMo1AAxrPRZ",
7      "feeCalculator": { "lamportsPerSignature": 5000 }
8    }
9  },
10  "id": 1
11}
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