92 percent of the world's currency is digital

This means that most of the money we earn, transact with, use to buy goods/services and so on exists only on computers and hard drives. Only 8 percent of currency globally is used as physical money.

All the black money comes under this 8 percent. This is a fair estimate that economists seems to agree it but, not as an exact figure. This low percentage seems foolish but when you stop to think, it makes sense considering that most of the larger amount transactions are done electronically anyway.

Eventhough banks store electronically they also store the 92 percent( includes all kinds of transactions done using credit/debit cards and wire transfers) online money in their data entry format. Might be a good idea to revisit all those hacker movies where a nerdy computer hacker manages to siphon billions off in just a few minutes.