Progress is accelerating on more advanced solutions such as lightning , with transactions being sent on testnets as well as some using real bitcoin. For the first time we have a system that allows for convenient digital transfers in a decentralized, trust-free and tamper-proof way. Note: specific businesses mentioned here are not the only options available, and should not be taken as a recommendation. Bitcoin image via Shutterstock. There is no use whatsoever for these share blocks, but they are recorded as proof of work to show that miners are trying to solve blocks.