Function is_subscription_event

pub fn is_subscription_event(json: &Value) -> bool

Determines if a JSON message is a subscription event notification from the blockchain RPC server.

Example response:

{
  "jsonrpc": "2.0", "method": "eth_subscription", "params": {
    "subscription": "0x9cef478923ff08bf67fde6c64013158d",
    "result": ...
   }
}