bkockchain

Before $BTC many digital cash technologies were introduced as an alternative to paper money to avoid financial institutions as an intermediary in online transactions and to make it in such a way that it will be secure and fast and privacy is protected.
And the concept of a Hashcash and a proof of work scheme, a peer to peer network, was developed.
The main purpose of all those developments was to ensure security and protection from spam and hacker attacks. However, they all have their own weaknesses and have a vulnerability to one of the existing threats.
#Nakamotos innovation was an interplay of existing solutions to solve all those problems and was the first to introduce the decentralized, Sybil resistant, Byzantine fault tolerant digital cash system that would later be referred to as the first #bkockchain

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