Bitcoin was the first to overcome the problems of centralization. Earlier forms of currency had used a centralised checking system much like banks in order to verify transactions and over come the double spend issue. However centralization within digital currency exposes the currency to attacks from hackers, and make it reliant upon its parent company.

he possibilities for a decentralised currency are many. At Bitspark we utilize blockchain technology to provide faster and cheaper remittances in fiat. Providing these currency services has already widened the renown of Bitcoin, exemplifying how useful crypto can be.

https://steemit.com/bitspark/@bitspark/why-is-bitcoin-making-the-world-go-crazy