mortal

Utility

0x2e1e37120d76...45c02b6d34f1

Tangerine WhistleSource VerifiedEdit this contract

Deployed November 18, 2016 (9 years ago)Block 2,651,113

The mortal base of the go-ethereum Contract Tutorial deployed on its own: it records its creator and lets only that account destroy it.

Tangerine Whistle EraVerified Source

Historical Significance

The ownership plus kill pair this contract implements is the shape early Solidity contracts inherited almost universally, and the tutorial that taught it introduced it on its own before using it. Deployed by itself it records a reader working through the page one contract at a time.

Context

Ethereum's Frontier network went live on 30 July 2015. The Contract Tutorial on the go-ethereum wiki, which the Frontier Guide included by reference, was the standard introduction of that period: it opens with a multiply function, then a mortal base, then the greeter, then a token. Contracts were compiled and deployed from the geth console.

Key Facts

Deployer

0x8b82f6...1ad935

Deployment Block

2,651,113

Deployment Date

Nov 18, 2016, 06:28 PM

Code Size

221.0 B

Deployment Transaction: 0xa76f10f4c1c1a0a9...6481fbf7e1e4c263

Description

The mortal base contract from the Contract Tutorial on the go-ethereum wiki, deployed alone rather than as the parent of a greeter. Its constructor stores the account that created it, and kill() self-destructs the contract and sends any balance to that account. Nobody else can call it to any effect and there is nothing else to call.

A deployment like this is the deploy-and-destroy cycle being tested, not an application: the tutorial introduces mortal first and then builds the greeter on top of it.

Heuristic Analysis

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

Detected Type: Utility

Tangerine Whistle Era

Emergency fork to address DoS attacks. Repriced IO-heavy opcodes.

Block span: 2,463,000 — 2,674,999

October 18, 2016 — November 22, 2016

Bytecode Overview

Opcodes221

Unique Opcodes34

Jump Instructions9

Storage Operations3

Verified Source Available

This contract has verified source code on Etherscan.

Verified on Etherscan

Show source code (Solidity)

// Submitted by EthereumHistory (ethereumhistory.com)
contract mortal {
    /* Define variable owner of the type address*/
    address owner;

    /* this function is executed at initialization and sets the owner of the contract */
    function mortal() { owner = msg.sender; }

    /* Function to recover the funds on the contract */
    function kill() { if (msg.sender == owner) suicide(owner); }
}

contract greeter is mortal {
    /* define variable greeting of the type string */
    string greeting;
    
    /* this runs when the contract is executed */
    function greeter(string _greeting) public {
        greeting = _greeting;
    }

    /* main function */
    function greet() constant returns (string) {
        return greeting;
    }
}