Logs

Unknown

0x8e96a2c65e9f...bc870adefeec

FrontierContract #2,673Exact Bytecode MatchEdit this contract

Deployed October 25, 2015 (10 years ago)Block 435,333

A minimal on-chain logging contract: addLog(s) emits a Log(string) event and addBreak() records the current block number as a section marker.

Frontier EraVerified Source

Key Facts

Deployer

Vitalik Buterin(0x1db343...fa6ee6)

Deployment Block

435,333

Deployment Date

Oct 25, 2015, 01:41 AM

Code Size

324.0 B

Gas at Deploy

120,775

Transactions by Year

201533

Deployment Transaction: 0xa2a10f3142716d6e...d74515b18e404f04

Description

Deployed October 25, 2015 by Vitalik Buterin (0x1db3439a22ee7c4d034e9b26437d3960b5af0517) in block 435333. A minimal on-chain logging / journal contract written in Serpent; the canonical source is list_logs/main.se from ethereum/dapp-bin. addLog(v) emits a Log(string) event carrying an arbitrary string (using the event log as append-only storage), addBreak() records the current block number into storage as a section marker, and getLatestBreak() returns it. The deployed runtime (302 bytes) and full creation code (324 bytes) reproduce byte-for-byte from the Serpent source using ethereum/serpent commit f0b4128. runtime sha256 43ca169c61105edc9bdefd34e56a60bebd5557ddeb87370560af99922305d7b6.

Source Verified

SerpentExact bytecode match(324 bytes)

Compiler: f0b4128

View verification proof

Source is list_logs/main.se from ethereum/dapp-bin. Deployed runtime (302 bytes) and creation code (324 bytes) reproduce byte-for-byte using ethereum/serpent commit f0b4128. runtime sha256 43ca169c61105edc9bdefd34e56a60bebd5557ddeb87370560af99922305d7b6; creation sha256 0a4c37f63bdc8414c92ca5abf1565ba28b3e452d5d7fb682901ea900d6c5fec6.

Heuristic Analysis

The following characteristics were detected through bytecode analysis and may not be accurate.

Detected Type: Unknown

Frontier Era

The initial release of Ethereum. A bare-bones implementation for technical users.

Block span: 0 — 1,149,999

July 30, 2015 — March 14, 2016

Bytecode Overview

Opcodes324

Unique Opcodes83

Jump Instructions13

Storage Operations4

Verified Source Available

Source verified through compiler archaeology and exact bytecode matching.

View Verification Proof

Show source code (Serpent)

event Log(value:string)
data break

def init():
    self.break = block.number

def addLog(v:str):
    log(type=Log, v)

def addBreak():
    self.break = block.number

def const getLatestBreak():
    return(self.break)

External Links

Etherscan Verified Source (if any)

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