Blockchain

Transcript

1. Blockchain: A disambiguation @tarasyarema Hacking Lliure Fall 2018
2. 1. What is a blockchain? 1.1 Blocks 1.2 Chained information 1.3 Decentralized 2. Example 2.1 Bitcoin
3. What is a blockchain? Definition (1) We define a blockchain as a chain of blocks.
4. What is a blockchain? Figure 1: A meme.
5. What is a blockchain? Definition (2) We define a blockchain as a chain of blocks in which every block has some information of the previous block. Question What kind of information?
6. What is a blockchain? Question What kind of information? Answer Usually cryptography, but...
7. What is a blockchain? Figure 2: How blocks are chained.
8. What is a blockchain? Definition (3) We define a blockchain as a decentralized chain of blocks in which every block has some information of the previous block. Question What’s a decentralized network?
9. What is a blockchain? Figure 3: Decentralized network.
10. What is a blockchain? Question What are the blocks? Answer It could be anything. Love letters, transactions or even programs.
11. What is a blockchain? Figure 4: Example of blockchain.
12. What is a blockchain? Question But... How to create new blocks? Answer The process it’s called mining. Someone adds a block and send it to the network. If the block fits the protocol, it’s accepted and added to the chain.
13. What is a blockchain? Figure 5: Mining.
14. Bitcoin Figure 6: Another meme.
15. Bitcoin Bitcoin was the first cryptocurrency ever. It was proposed by Satoshi Nakamoto in the famous paper named ”Bitcoin: A Peer-to-Peer Electronic Cash System”. Figure 7: Satoshi’s whitepaper.
16. Bitcoin Figure 8: Bitcoin blockchain explorer.
17. Bitcoin Figure 9: Bitcoin blocks store previous block hash.
18. Bitcoin Figure 10: Bitcoin nodes distribution.
19. Bitcoin Figure 11: Distribution of Bitcoins’s mining hashpower.