I want to hear from people who have actually done this. I suspect they all have well-known track records and are selling to people who trust them to deliver. I

I want to hear from people who have actually done this. I suspect they all have well-known track records and are selling to people who trust them to deliver. I still haven’t met anyone personally (myself included) who managed to presell software with nothing but a presentation. I think the more common route is “find the first customer and build v1 for them as a consultant at a steep discount”.