Mortal

Utility

0xf1d57f9bc33b...78afddd06c8d

FrontierContract #5,340Exact Bytecode MatchEdit this contract

Deployed December 18, 2015 (10 years ago)Block 708,251

The guide's kill contract with a coin flip added to its fallback

Frontier EraVerified Source

Historical Significance

Randomness is the problem gambling contracts exist to expose. Every value available inside the EVM is either known in advance or chosen by the account producing the block, so a payout decided from block data can be steered by whoever mines it. This run of revisions is that lesson being learned in public, one deployment at a time, and the answer the ecosystem eventually reached, an oracle or a commit and reveal, is not available here at all.

Context

Deployed in December 2015 on the Frontier chain.

Key Facts

Deployer

0x86c41e...e91e37

Deployment Block

708,251

Deployment Date

Dec 18, 2015, 01:09 AM

Code Size

384.0 B

Gas at Deploy

127,869

Deployment Transaction: 0x070943dd79c4392d...7b2aa84575eb47c3

Description

It keeps the standard shape of the mortal example, an owner recorded at construction and a kill that returns the balance to that owner, and adds a payable fallback that gambles. Every payment reads the block timestamp: if it is even the call simply returns and the contract keeps the money, and if it is odd the sender is paid back twice what they sent. There is no check that the contract can cover the payout, so a win against an empty balance simply fails to send.

Source Verified

Exact bytecode match(384 bytes)

Compiler: v0.1.6+

View verification proof

Heuristic Analysis

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

Detected Type: Utility

Contains SELFDESTRUCT opcode

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

Opcodes384

Unique Opcodes57

Jump Instructions14

Storage Operations4

Verified Source Available

Source verified through compiler archaeology and exact bytecode matching.

Verified on Etherscan

View Verification Proof

Show source code (Solidity)

// Submitted by EthereumHistory (ethereumhistory.com)
contract Mortal {

    address owner;

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

    function kill() {
        if (msg.sender == owner) {
            suicide(owner);
        }
    }

    function() {
        var v = msg.value;
        var t = block.timestamp;
        if (t % 2 == 0) {
            return;
        } else {
            msg.sender.send(2 * v);
        }
    }
}

External Links

Etherscan Verified Source (if any)

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