A Pocket Full Of Crypt and Everywhere To Spend It

Currency among Edgerunners must, by necessity, be trackless and anonymous. Edgerunners themselves must, by necessity, be trackless and anonymous. Thus, using Neo-Corp managed and maintained banking systems that have cameras everywhere and AI audit routines looking for “dirty money” seems a bit … stupid.
On the other hand, it’s not like you can have a truckload of collected barter stock, either. That just means you spend all your time defending your stuff. Your life, by necessity, is rootless and hyper-mobile. Few Edgerunners ever have a permanent address; if they do, it’s a jealously guarded secret. You might call it your bolt-hole, but your enemy calls it a fixed target.
Waving wads of cash around just attracts attention of the sort that leads to gunfights and medical bills. Some paper currency is OK, but you’re always playing a game of hoping it hasn’t been declared worthless by next Tuesday.
That leaves digital crypto-currency. It’s a faceless, anonymous underground economy that runs via peer-to-peer encrypted transactions to 32-character disposable digital addresses that have no way of giving up the identity of the owner. Flash up your NetHook, enter the destination address and amount, and it’s “wired” instantly. You get a unique transaction ID that is only known to the two ends of the transaction, so you can confirm it was really you that sent the money.
Going one step further are “Crytpo Cash Cards” … one-use-only real-world representations of various values of digital crypto-currency. You get the card, wave it in front of the near-field scanner on your NetHook, the card is dead and the value inside is yours.
This is collectively called “Crypt”, or “Scrypt”. Most places an Edgerunner deals with will quietly accept Crypt/Scrypt. They’d be stupid not to; the government and the corps can’t tax what they can’t see.
Which means that, like most things in an Edgerunner’s life … it’s illegal to use Crypt/Scrypt.