Blockchain - the technology underpinning digital currency Bitcoin - has been in the news lately.
Banks think it could be the future of financial transactions, while diamond miners hope it will help end the trade in conflict diamonds.
And this week the UK's chief scientific adviser encouraged the British government to adopt the technology.
But what exactly is it and why is it causing such a stir? Technology of Business (tries) to explain.
Does it have anything to do with bicycles?
No. Blockchain is a method of recording data - a digital ledger of transactions, agreements, contracts - anything that needs to be independently recorded and verified as having happened.
The big difference is that this ledger isn't stored in one place, it's distributed across several, hundreds or even thousands of computers around the world.