This blog post originally appeared on Casey’s Medium blog. Six years ago today, Casey Hewitt got off a plane with notes and ideas after meeting with pen-testing customers in Melbourne about bug bounty programs. The conversations and ideas coalesced into the concept of Bugcrowd, which was born when Casey registered the @bugcrowd Twitter handle and domain, invited hackers to sign up, ran a proof-of-concept bounty, brought on a Co-founder, and started running programs for customers and charities less than three months later. The team, customers, crowd, and competitors have collectively achieved the acceptance of crowdsourced security, which has irreversibly changed how the Internet defends itself.