That means setting up a central bank, with billions of a recognised stable currency in its accounts (or gold in its vaults).
We have billions in a recognised stable currency and/or gold backing our Scottish notes already.
The pound is backed by nothing. Independence is a perfect opportunity for Scotland to move towards a currency that retains its value by backing it with either something finite or something tangible. One economic commentator jokingly suggested backing it with whisky. My suggestion is to back the Scottish pound with a finite cryptocurrency similar to Bitcoin. Coins and notes embedded with unique numbers devised by mathematics can be issued and scanned, any numbers not recognised instantly recognised as fake.
The best thing about using these alt. currencies is you can't fake a mathematical algorithm, and as long as you keep your security up to date they're difficult to steal. Plus, when the pound/dollar, actually just about every FIAT currency either goes tits up or the banks go bust in a couple of years time your digital currency will be the only currency, other than Bitcoin , gold or silver worth anything because of its exclusivity.