Think the tech bubble is going to burst? Then put your money where your mouth is.

As early-stage startups capture millions within months of launching and receive sky-high valuations despite little to no revenue, those in tech have been sounding warning bells.

But Sam Altman, president of elite Silicon Valley accelerator Y Combinator, says he doesn't subscribe to this belief.

In a blog post. Altman acknowledges that yes, there have been some unreasonable early-stage valuations, but those are insignificant compared to the larger market.

"It's a small amount of capital and still nothing I would call a 'bubble,'" he wrote. He admits that he's "pretty paranoid" about bubbles -- yet he feels very hopeful about the future of tech.

And he's willing to bet on it.

He makes three bets on the future of tech five years from now.