Owned

Utility

0x2137105639c4...217cfd798d50

FrontierContract #1,873Source VerifiedEdit this contract

Deployed October 11, 2015 (10 years ago)Block 365,803

An ownership holder with no access control: it stores one address and any account at all can overwrite it.

Frontier EraVerified Source

Historical Significance

An ownership base contract written without the check that makes ownership mean anything. The pattern this one is missing, a guard comparing msg.sender against the stored owner, became the modifier that nearly every later contract inherits.

Context

Ethereum's Frontier network went live on 30 July 2015. Almost nothing was deployed in its first months except tutorial code and small experiments, written in a Solidity only a few months old and with no test network in common use, so the experiments happened on mainnet.

Key Facts

Deployer

0x4962f6...a40098

Deployment Block

365,803

Deployment Date

Oct 11, 2015, 05:20 AM

Code Size

251.0 B

Gas at Deploy

82,583

Deployment Transaction: 0x82591c25d448fc91...fba9e9e3b6b489f7

Description

A contract that stores a single address and exposes two functions: setOwnerAddress(newOwner) writes it and get() reads it back.

setOwnerAddress carries no check on who is calling, so the owner slot is not owned by anybody: any account can take it at any time by sending one transaction. Nothing else in the contract depends on the value, so nothing is at risk here, but the same two functions inherited by a contract that holds funds would give them away.

The same account published these two functions again four thousand blocks later with the declarations in the opposite order.

Heuristic Analysis

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

Detected Type: Utility

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

Opcodes251

Unique Opcodes51

Jump Instructions11

Storage Operations4

Verified Source Available

This contract has verified source code on Etherscan.

Verified on Etherscan

Show source code (Solidity)

// Submitted by EthereumHistory (ethereumhistory.com)
contract Owned {
    address owner;

    function setOwnerAddress(address newOwner) {
        owner = newOwner;
    }

    function get() returns (address) {
        return owner;
    }
}

External Links

Etherscan Verified Source (if any)

Related contracts

SimpleStorage

Same deployer

The SimpleStorage example that opens the Solidity documentation, retyped with its two functions in the other order.

0xbde154...a32a80October 11, 2015