owned

Utility

0x21c6fff0ec68...0b749cc14197

FrontierExact Bytecode MatchEdit this contract

Deployed March 11, 2016 (10 years ago)Block 1,133,707

The owned ownership mixin at 153 bytes, deployed 11 March 2016.

Frontier EraVerified Source

Historical Significance

The ownership mixin every later contract inherits, deployed by itself with nothing on top of it. Its whole content is the pattern that access control in Solidity is built from: an address recorded at construction, a modifier that compares the caller against it, and a handover that only the current holder may perform.

Context

Deployed three days before the Homestead activation at block 1,150,000.

Key Facts

Deployer

0x9c4149...831d16

Deployment Block

1,133,707

Deployment Date

Mar 11, 2016, 02:15 PM

Code Size

153.0 B

Transactions by Year

20161

Deployment Transaction: 0xa20068513bceaea7...5370bc3ef8e4691c

Description

This is the ownership base contract from the ethereum.org token tutorial, deployed on its own with nothing inheriting it. It stores the deployer in a public owner slot and gates a transferOwnership setter behind an onlyOwner modifier that throws for anyone else. It holds no funds, moves nothing and has no token interface. Deployed by 0x9c41495f35a0738f89d22800446b2b01b7831d16, which is the shape of someone working down the tutorial and deploying each code block as they reach it.

Source Verified

Exact bytecode match(153 bytes)

Compiler: v0.1.4+

View verification proof

Historian Categories

Utility

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

Opcodes153

Unique Opcodes42

Jump Instructions7

Storage Operations4

Verified Source Available

Source verified through compiler archaeology and exact bytecode matching.

View Verification Proof

Show source code (Solidity)

// Submitted by EthereumHistory (ethereumhistory.com)
contract MyToken {         
    /* This creates an array with all balances */
    mapping (address => uint256) public balanceOf;   
}

contract owned {
    address public owner;

    function owned() {
        owner = msg.sender;
    }

    modifier onlyOwner {
        if (msg.sender != owner) throw;
        _
    }

    function transferOwnership(address newOwner) onlyOwner {
        owner = newOwner;
    }
}

External Links

Etherscan Verified Source (if any)

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