After the Wendy's transaction he became the fast food chain's largest shareholder, gaining more than 16 million shares.

FORBES: Ronald Joyce

If your data is currency such as access control to various amounts of bitcoin on the block chain, then you have surrendered your financial transaction history and potentially the value itself.

FORBES: Move up http://i.forbesimg.com t Move down

Mr Sterligov's system sees a cash payment being paid on the last transaction, with that money going to the first link in the chain.

BBC: Haggling and bartering gain appeal