How easily would a collision appear if you had two goroutines creation nanosecond timestamps? Is this a good idea for unique ID generation that would fit in an int64? https://play.golang.org/p/ow0QYTMa30

unixnano.go

package main

import (
	"log"
	"time"
)

func main() {

	var counter int

	one := make(chan int64)
	two := make(chan int64)

	go func() {
		for {
			one <- time.Now().UnixNano()
		}
	}()

	go func() {
		for {
			two <- time.Now().UnixNano()
		}
	}()

	// Read both values
	for a := range one {
		counter++
		b := <-two

		if a == b {
			log.Fatalf("Match: %d (%d tries)", a, counter)
		}
	}

}

$ go run unixnano.go
2017/06/19 07:40:42 Match: 1505835642386934000 (588843 tries)