How about you just finding an installer first. Once you get the kit though, it should remain safe for many years if you don’t open the kit and play with it. Just leave it in the box and you’ll be fine keeping it on the shelf for up to 5 years basically.
We used to accept cryptocurrency but accounting law surrounding crypto is extremely complex and none of the wallets or exchanges offer very good tax documentation for using crypto as a currency… they only focus on crypto as an investment.
It’s an interesting question… like what happens if your pacemaker uses licensed software to manage it and that license expires or is changed… I totally get that. But, in this case of our particular products being extremely simple transponders, there’s nothing to worry about in that sense.