When was Ray Coin launched?

Could you please elaborate on the timeline of Ray Coin's launch? I'm particularly interested in understanding when the initial concept was conceived, when the development phase began, and ultimately, the exact date of its official launch. Additionally, if there were any significant milestones or updates along the way, it would be great to hear about those as well. The reason for my inquiry is to gain a better understanding of the project's progress and potential. Thank you for your time and insight into this matter.