// Request
curl https://starknet.blockpi.network/v1/rpc/your-rpc-key -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"starknet_blockHashAndNumber","params":[],"id":0}'
// Result
{
"id": 0,
"jsonrpc": "2.0",
"result": {
"block_hash": "0x71e608d343ff70f3baa49504ca9b9ec33cd16449222c3bf6922518c296e1e78",
"block_number": 472485
}
}