the first blockchain model was conceived in a small island, the sea island, located in the Pacific Ocean which together with the islands of Chuuk, Pohnpei and Kosrae collects the Federated States of Micronesia.
how is it possible? you will ask yourself;
around 1400 the inhabitants of this island reach Palau, an island about 400km away from yap and prizes fascinated by a particular local stone that began to extract from the mines (like mining for bitcoin) of exchange
as regards the size of the data, to make it more easily transportable, given the enormous weight of each currency.
One of the criteria against which the value of an RAI (so called) was compared to another was the size of the stone and its history from the moment when the adventure began at the time of shooting, for example, more time was spent for the extraction, its value was high, if someone died during transport, the value increased, and was also determined on the basis of previous owners.
these stones, however, being so thinking (up to 4 tons) can not be transported by the buyer to the seller each time a transaction was made.
So he invented an ingenious method: each inhabitant kept a property register for everything that was done in the future. the same operation as well as to avoid that the transactions ended up in a central system like a single of Rai it is easy to come across these heavy disks of stone abandoned in the gardens of the water is also the risk that nobody tries to steal them.
the potentialities of a decentralized system like the blockchain are so evisive that 1500 years ago the intuition in the small island of yap where it is still used for the ships that are considered (like bitcoin) a commodity comparable to gold, viente handed down from generation to generation, while for the everyday expenses they are preying a coffee at the bar using the American dollar.
if you would like to document more I leave you the link of a PDF in which everything is documented:
http://www.sil.si.edu/smithsoniancontributions/HistoryTechnology/pdf_lo/SSHT-0023.pdf