I've heard Math.random() is based on timestamp. I wanted to check how we can predict it with maximum accuracy. So if that two numbers are close together (can be the same in multithreads maybe), we can definitely check and hack any system based on Math.random().

hackRandom.js

(function(interval){
  const start = Date.now()
  const end = start + 1000
  let i = 0
  function hackRandom () {
    let now = Date.now()
    if (now > end) { 
      console.log(`timestamp: ${now}`, `random: ${Math.random()}`)
      i++ 
    }
    if (i > 1) { 
      clearInterval(a)
      clearInterval(b)
    }
  }
  var a = setInterval(hackRandom, interval)
  var b = setInterval(hackRandom, interval)
})(100)