Bitcoin Blockchain (2008)
Bitcoin was introduced by an unknown person named Satoshi Nakamoto.
It is believed that Satoshi Nakamoto is a group of entrepreneurs since the idea is clearly bigger than just one person.
Paper describing the concept of Bitcoin was published through a metzdowd.com cryptography mailing list on October 31, 2008.
Satoshi Nakamoto introduces a peer-to-peer electronic cash system that allows direct online payments from one party to another without going through a financial institution like banks.
The cash system has a proof-of-work concept to address the double spending problem.
The cash system is free from all kind of cyber attacks as it's decentralized and distributed across various nodes worldwide. Bitcoin blockchain is limited to carry out transactions only.
Ethereum Blockchain (2015)
The second major Blockchain 2.0 was Ethereum that came in year 2015.
Vitalik Buterin the creator of Ethereum says, "if bitcoin is like currency over the internet than Ethereum is like relationships over the internet".
Ethereum was a remarkable breakthrough in Blockchain technology, as it opens its gates for everyone to develop and launch distributed apps (DAPPs) over it.
This led to the evolution of Initial Coin Offerings (ICO's). As there are thousands of ICOs launched, only handful of them have their own blockchain. Majority of ICO's launch became possible only because of Ethereum blockchain.
Ethereum differs from Bitcoin in a sense that it's just not a cryptocurrency, it's a platform where everyone can create his own decentralized application like prediction market, gaming, betting, all these are not under single person control, free from censorship, have no single point of failure and many more such features.
Expert classify Ethereum as better version of Bitcoin Blockchain.
Aeternity Blockchain (2018)
Aeternity is a next-generation blockchain technology 3.0 that is going to solve issues like scalability, privacy and transaction speed.
Aeternity is developed by professionals who have learned a lot from first and second generation Blockchains.
Aeternity for the very first time bring privacy to blockchain by introducing state channels, State channels ensures that only stakeholders involved in the smart contract should know the underlying details.
Aeternity makes mining decentralized, you can mine Aeternity even on your laptop. The consensus is achieved by proof of work, while governance mechanism runs on proof of stake model that is based on prediction markets.
Lastly Aeternity bridges gap between real-world data and smart contracts. Any real-world data can be connected to a smart contract running on Aeternity blockchain.
I classify Aeternity we be a better version of the Ethereum Blockchain.
Competition article written by madaz