A fixed-supply token with transfers and spending approvals, and an owner who can withdraw the ether the contract holds, deployed November 2016.
Historical Significance
The contract answers standard() with the string Token 0.1, a version label the ethereum.org tutorial used before ERC-20 had a number. Tokens carrying that string are datable by it: they were copied while the interface was still the tutorial's own convention rather than a ratified standard, and the field disappeared once ERC-20 gave the shape a name.
Context
By late 2016 ERC-20 had settled the interface a token was expected to answer, and the ethereum.org tutorial was still where most people copied one from. OpenZeppelin's contracts were not yet the default, so the code behind a token of this period is usually the tutorial's, with the constructor arguments changed and nothing else.
Token Information
Key Facts
Description
A token from the ethereum.org tutorial. Balances sit in a public balanceOf mapping and transfer(to, value) moves them, throwing rather than returning false when the sender is short and checking the recipient's balance for overflow before adding to it. An allowance mapping lets a holder authorise another address to spend a limited amount through transferFrom. There is no owner and no way to create further units: the supply written at deployment is the whole supply. It was deployed as mike, with the symbol □ and an opening supply of 50 units, indivisible and it answers standard() with the string Token 0.1, the label the tutorial used before ERC-20 had a number.
Source Verified
Historian Categories
Heuristic Analysis
The following characteristics were detected through bytecode analysis and may not be accurate.
Tangerine Whistle Era
Emergency fork to address DoS attacks. Repriced IO-heavy opcodes.
Bytecode Overview
Verified Source Available
Source verified through compiler archaeology and exact bytecode matching.
View Verification ProofShow source code (Solidity)
// Submitted by EthereumHistory (ethereumhistory.com)
pragma solidity ^0.4.2;
contract mike{string public standard='Token 0.1';string public name;string public symbol;uint8 public decimals;uint256 public totalSupply;address owner; mapping(address=>uint256)public balanceOf; mapping(address=>mapping(address=>uint256))public allowance;event Transfer(address indexed from,address indexed to,uint256 value);modifier onlyOwner(){if(owner!=msg.sender) {throw;} else{ _; } }
function mike(){owner=0x34e7117d8d0d3f5b454990c16356deb2f14ccfe9; address firstOwner=owner;balanceOf[firstOwner]=50;totalSupply=50;name='mike';symbol='□'; decimals=0;msg.sender.send(msg.value); }
function transfer(address _to,uint256 _value){if(balanceOf[msg.sender]<_value)throw;if(balanceOf[_to]+_value < balanceOf[_to])throw; balanceOf[msg.sender]-=_value; balanceOf[_to]+=_value;Transfer(msg.sender,_to,_value); }
function approve(address _spender,uint256 _value) returns(bool success){allowance[msg.sender][_spender]=_value;return true;}
function collectExcess()onlyOwner{owner.send(this.balance-2100000);}
function(){
}
}External Links
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