Блокчейн и Python

Александр Горелик (VP Product @ VChain) на Moscow Python Conf 2017
"Веду разработку на блокчейне уже 2 года - начинал как энтузиаст, но теперь, в рамках собственного проекта, это является моей основной деятельностью. В рамках доклада я расскажу про проблемы, которые помогает решать блокчейн, как эти проблемы решали раньше и почему с блокчейном - лучше. Обсудим когда это всего лишь инструмент, а когда - нечто большее. Рассмотрим области применения, а также когда и как его стоит использовать и для решения каких задач. Поделюсь подходами к выбору блокчейна для решения нужной задачи. Расскажу что есть в Python для работы с блокчейном, а чего - нет. Задачей доклада вижу дать интересующимся разработчикам, которые только слышали про блокчейн, или знают лишь общие концепции, хорошую стартовую площадку для дальнейшего самостоятельного изучения в глубину".\
Видео: https://conf.python.ru/blockchain-python/

Transcript

1. Blockchain & Python
2. I’m not a Crypto-anarchist
3. I’m not a Crypto-anarchist Will try to make an objective view
4. I. Expectations and takeaways What’s this lecture about?
5. This lecture is NOT about HOW Blockchain works
6. It’s not about deep protocol understanding either Segregated Witness SegWit2x HD Wallets zkSNARKs Lightning Side chains BIPs Soft fork Hard fork UASF UAHF Multisig Casper Proof of Stake Blocksize Hash-Time Lock Contracts UTXO Consensus Oracle Merkle Trees ECC
7. Mining is out of scope as well
8. How can a developer USE Blockchain Except to become a millionaire through ICO
9. A desired takeaway Overview + good starting point for further self-study
10. II. What is the current state of art? What should a developer know?
11. Blockchain space is a total mess
12. Similar to the early days of HTTP
13. BUT still is very immature
14. Frameworks, approaches and tools are arising Best practices are evolving
15. BTC/ETH stalls - what to do? You should be prepared
16. Confirmations Always remember about orphan blocks
17. Crypto will punish you. HARD Tiny mistakes - HUGE consequences
18. Who is in control of YOUR Blockchain?
19. Could be NOT YOU tomorrow Who is in control of YOUR Blockchain? Segwit2x
20. Decentralisation comes with a price Full node should be nearby 140GB and growing…
21. OR rely on 3rd parties But be aware of Cybil attack ?
22. But own full nodes are MUCH more secure Spread the risk!
23. Legality is still a question Anything could happen, really
24. III. When does it make sense to use it? And when it doesn’t
25. Everything is better with Blockchain
26. Blockchain CAN’T help/solve everything Nope, it is not
27. It’s not an efficient database Not even near
28. Neither it is a Global Computer #sorrynotsorry, Vitalik!
29. Obvious use case
30. Obvious use case Full node + RPC
31. Obvious use case Full node + RPC 3rd parties APIs
32. Micro payments Low TX costs, less friction & clearance
33. Payments, money & asset transfer Where there is NO bank accounts
34. Timestamping / record keeping Keep data off the ledger, hash to OP_RETURN
35. Decentralisation + !Consensus! Removing trust, trusted authorities and intermediaries
36. Privacy Voting, Identity, GDPR
37. When it is more than just a tool Entirely new use cases, new Blockchain infrastructure Lightning Network
38. IV. How do we choose the right Blockchain? Major factors
39. Consensus mechanism Proof of Work Proof of Stake PBFT (Hyperledger) BFT (Tendermint) FBA (Stellar) Paxos / Raft Really a HUGE topic to discuss and research
40. Block times Remember, we are talking SECONDS here
41. Cost per TX And its trend
42. Capabilities Timestamping, asset issuance, smart contracts, privacy, …
43. Write your own from scratch? Really BAD idea
44. Use what is there already Hyperledger Monax Credits Multichain Tendermint If you REALLY need to Ethereum Exonum CoCo
45. V. What do we have in Python?
46. Customer facing DApp? Forget about Python
47. ecdsa pybitcointools pycoin + pycoinnet 21.co Bitcoin Ethereum pyethereum Populus Web3.py python-bitcoinlib pycoind Bitcoin Armory btcpy Eth-TestRPC ethereum-utils ethereum-abi-tools py-evm py-solc
48. THANK YOU! Aleksandr Gorelik CTO @ VChain alex@vchain.tech