that makes sense, but regional currencies are having major issues (eu), why would a global currency work?
because there is no central authority, yet, i know 100% that i can trust you and you can trust me. meaning, you have item X, i want it, and offer you Y which has value to you. Value that you determine to be equal or more valuable than the X you own.
we agree to exchange your X for my Y, we make the deal, we go our separate ways. The physicality of this exchange was the trust. Meaning, i inspected your X this was my buyer be ware due diligence piece. I determine that X is what I need/want and of the quality i demand. you did the same for my Y.
How do you do that without the physicality and without the physical objects? simple, threat of ultimate violence by way of central authority. said central authority is now the trusted third party who is supposed to provide and steward the framework (the game) that allows us all to transact safely and in a trusted manner.
when government summarily fails, and they all have, the people have traditionally moved to a new 'better' system.
the block chain is our newest attempt at this new better system that moves the trust from the central government and their gun toting thugs and moves that to an open source algorithm.
i guess most usage right now is for illegal purchases or for "investing" and sitting on it
hasn't been true for awhile. well, in places like Argentina and other failed economies technically using BTC instead of the local failed currency is at best grey and most likely not legal but when your choices are failed currency that may lose half its value in your sleep, or BTC ... i mean can you blame them?