curl --request POST \
--url https://mainnet.helius-rpc.com/ \
--header 'Content-Type: application/json' \
--data '{
"jsonrpc": "2.0",
"id": "45",
"method": "isBlockhashValid",
"params": [
"J7rBdM6AecPDEZp8aPq5iPSNKVkU5Q76F3oAV4eW5wsW",
{
"commitment": "processed"
}
]
}'