Best way to go from idea to product would be to try to come up with a way to cheaply test your idea. It could be as simple as setting up a type-form or some other way to survey your potential customer base to find out if they'd pay for whatever product you have in mind.
I got my first customers the old fashioned way by picking up the phone and calling them. Since we initially were focused on merchants accepting bitcoin (bitpay was mainly only option back then) we were able to find a list of bitpay merchants and looked up their contact information on their website.
After talking to enough of them we learned they didn't really want the initial product but we did learn a ton about what they wanted. We collected and reflected on all the feedback and we were able to steer the product in a direction that some of those initial phone calls turned into our initial customers.
Thanks for the insight!
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