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POST
isBlockhashValid
curl --request POST \
  --url 'https://mainnet.helius-rpc.com/?api-key=' \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "id": "45",
  "method": "isBlockhashValid",
  "params": [
    "J7rBdM6AecPDEZp8aPq5iPSNKVkU5Q76F3oAV4eW5wsW",
    {
      "commitment": "processed"
    }
  ]
}
'
{
  "jsonrpc": "2.0",
  "id": "45",
  "result": {
    "context": {
      "slot": 2483
    },
    "value": false
  }
}

Documentation Index

Fetch the complete documentation index at: https://www.helius.dev/docs/llms.txt

Use this file to discover all available pages before exploring further.

​
Request Parameters

​
blockhash
string
required
Blockhash to check validity status for, as a base-58 encoded string.
​
commitment
string
The commitment level for the request.
  • confirmed
  • finalized
  • processed
​
minContextSlot
number
The minimum slot that the request can be evaluated at.

Authorizations

​
api-key
string
query
required

Your Helius API key. You can get one for free in the dashboard.

Body

application/json
​
jsonrpc
enum<string>
default:2.0

The JSON-RPC protocol version.

Available options:
2.0
Example:

"2.0"

​
id
string
default:1

A unique identifier for the request.

Example:

"45"

​
method
enum<string>
default:isBlockhashValid

The name of the RPC method to invoke.

Available options:
isBlockhashValid
Example:

"isBlockhashValid"

​
params
(string | object)[]

Parameters for evaluating blockhash validity.

Blockhash to check validity status for, as a base-58 encoded string.

Example:

"J7rBdM6AecPDEZp8aPq5iPSNKVkU5Q76F3oAV4eW5wsW"

Response

Successfully evaluated blockhash validity.

​
jsonrpc
enum<string>

The JSON-RPC protocol version.

Available options:
2.0
Example:

"2.0"

​
id
string

Identifier matching the request.

Example:

"45"

​
result
object

Blockhash validity result.