Ethereum Basics and Solidity Programming
Discover the fundamental concepts of Ethereum, including its architecture, blockchain implementation, transaction initiation, and more. Dive into Solidity programming, the high-level language used to interact with the Ethereum Virtual Machine.
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Presentation Transcript
Ethereum Basics & Solidity Programming Ethereum Basics & Solidity Programming TAU March 2019 Adapted from Stanford CS359B Spring 2018
Blockchain as a replicated state machine Transaction tx ? ? (?,?) txi txi+1 Si Si+1 Si+n Oi+1 Mined Block
Ethereum implementation Transaction tx ? ? (?,?) Ethereum defines interface S, I, O EVM bytecode contracts implement it (Turing complete!) Solidity is a high-level front end to EVM bytecode (Turing complete!) txi Si Si+1 Oi+1
Transaction initiation Account identification based on asymmetric cryptography Alice signs txs with her private key, sent to network Blockchain miners verify Alice s identity Source: Wikipedia
Ethereum architecture high level overview - States Address State id : pubkey 160b balance : 256b storage : 256b -> 256b code: blob metadata : Event log Si Block State Tx log number : 256b hash : 256b timestamp : 256b
Ethereum architecture high level overview - States Address State id : pubkey 160b balance : 256b storage : 256b -> 256b code: blob metadata : Event log Si Contract if exists Account othewise Block State Tx log number : 256b hash : 256b timestamp : 256b
Ethereum architecture high level overview Inputs/Outputs Input parameters to a transaction message: Target address Amount of ether (atomic balance update) Source address (auto-filled) Gas (Limit execution time) Gas price bid per unit of gas Data (blob) Identifies source-level function called Formal parameters Output Blob
Ethereum architecture high level overview Inputs/Outputs Input parameters to a transaction message: Target address Amount of ether (atomic balance update) Source address (auto-filled) Gas (Limit execution time) Gas price bid per unit of gas Data (blob) Identifies source-level function called Formal parameters Output Blob
