greeter

Utility

0x7318ee0b974e...5c6885824510

Tangerine WhistleSource VerifiedEdit this contract

Deployed November 19, 2016 (9 years ago)Block 2,655,562

The go-ethereum Contract Tutorial greeter, deployed with the greeting: hello cibi

Tangerine Whistle EraVerified Source

Historical Significance

The Contract Tutorial was the introduction to Solidity that shipped with go-ethereum, and deploying the greeter was its final step. Each copy therefore preserves the sentence its author chose to write onto a public chain while learning the tools. The Solidity source here was recovered by compiling the tutorial text with period compilers until the output matched the deployed bytecode exactly.

Context

The Contract Tutorial on the go-ethereum wiki was written for Frontier in 2015 and stayed in use as an introduction to Solidity well past the Homestead fork of March 2016. Copies of its greeter went on being deployed to mainnet by people working through the tutorial, compiled with whichever Solidity release was current when they reached the last step.

Key Facts

Deployer

0x982e72...264cca

Deployment Block

2,655,562

Deployment Date

Nov 19, 2016, 12:01 PM

Code Size

389.0 B

Deployment Transaction: 0xcfaa7e9162d2638d...d6a13bb0d720f67c

Description

The greeter is the worked example of the Contract Tutorial on the go-ethereum wiki. It inherits a base contract named mortal, which records the account that created it and exposes kill(), a function that self-destructs the contract and sends its balance to that account. Only the creator can call it.

The greeter itself adds one string. The constructor stores the greeting given at deployment and greet() returns it. There is no setter, so the greeting a copy is born with is the only greeting it ever has, and no account other than the creator can affect it.

This copy was deployed with the greeting: hello cibi

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

Opcodes389

Unique Opcodes58

Jump Instructions17

Storage Operations6

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;
    }
}