Networks

• immutability
• security
• decentralization
• transparency
• openness

Characteristics of a blockchain 

Blockchain has:

• consensus alghorithm
  • Proof of Work
  • Proof of Stake
  • Delegated Proof of Stake
  • etc.
• incentives structure/economy
• token distribution model
• open sources and open data!

Different blockchains

http://coinmarketcap.com/

• Bitcoin
• Ethereum
• Ripple
• Litecoin
• Dash
• NEM
• IOTA (not a blockchain)
• Monero
• Steem
• and few hundreds more...