This document introduces smart contracts on Ethereum using the Solidity programming language. It explains that Ethereum builds upon Bitcoin by introducing a Turing-complete virtual machine that allows for more complex smart contracts. Solidity is an object-oriented language that compiles to bytecode run on the Ethereum Virtual Machine. Smart contracts can send and receive cryptocurrency and be deployed on the Ethereum mainnet or testnets. The document outlines some current limitations of Ethereum and provides useful links for developing with Solidity.

1. INTRODUCTION TO SMART CONTRACTS
WITH SOLIDITY AND ETHEREUM

2. INTRO
BITCOIN
▸ Cryptocurrency
▸ One shared distributed ledger
▸ Can’t be falsified
▸ Database of transactions
▸ Support for “Script”
▸ Limited smart contracts capabilities

3. INTRO
ETHEREUM
▸ Bitcoin like distributed ledger
▸ Ethereum Virtual Machine
▸ Turing complete
▸ Blockchain
▸ Contracts (code)
▸ Storage
▸ Logs
▸ Events

4. ETHEREUM
HOW IT WORKS?
▸ Every node runs every contract
▸ Deterministic
▸ Ether (cryptocurrency)
▸ Two kind of actors
▸ Contracts
▸ Wallets
▸ Transaction = messages
▸ Code execution spend gas
(ethereum)

5. CONTRACTS
SOLIDITY

6. SOLIDITY

7. SOLIDITY

8. SOLIDITY

9. ETHEREUM.GITHUB.IO/
BROWSER-SOLIDITY

11. ETHEREUM.RB

12. ETHEREUM.RB

14. CONTRACTS
SOLIDITY
▸ Object oriented language
▸ Complied to EVM
▸ Can send and receive ether
▸ Can be run on production, testnet
or private net

15. PURCHASE

16. SOLIDITY

17. SOLIDITY

18. DISTRIBUTED
FUTURE

19. ETHEREUM
LIMITATIONS
▸ Transaction takes coupe of minutes
to be mined
▸ Storage and execution is
expensive
▸ Ecosystem is young

20. ETHEREUM
OFF CHAIN
▸ Half-distributed
▸ IPFS
▸ Oracles and Oraclize
▸ Swarm - distributed storage with
incentives

21. ETHEREUM
METROPOLIS
▸ Casper - proof of stake
▸ Scalability
▸ zkSNARKs - privacy

22. BLOCKCHAIN 2.0?

23. TEXT
USEFUL LINKS
▸ Online editor:
ethereum.github.io/browser-solidity
▸ Blockchain explorer:
testnet.etherscan.io
▸ Ethereum ruby gem:
github.com/marekkirejczyk/ethereum.rb
▸ Example ruby app:
github.com/marekkirejczyk/ruby_ethereum_example

24. THANK YOU!@MAREKKIREJCZYK