A common missconception is that to 'Coin' a phrase means that you are the first person say/write a phrase that is then adopted by the general public.
In fact, to 'coin a phrase' is the first person to earn a buck from it - for example: in the press.
"When you come down to 'brass tacks' - if we may be allowed the expression - everybody is governed by selfishness."
All of the other known early citations either originate in, or refer to, Texas. It is reasonable to assume that the phrase was coined there, in or about the 1860s.
Newly originating to mean you have 'coined' an idea.
But now similarly emphised by crooks.
A term that is used, to describe a personal gain of someone else.
'Leave your window open and your coined'
Some one has just had an idea to target your monies, if using his new idea, your coined.