added erc20

EIPS/eip-token-standard.md

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+This is the suggested template for new EIPs.
+
+Note that an EIP number will be assigned by an editor. When opening a pull request to submit your EIP, please use an abbreviated title in the filename, `eip-draft_title_abbrev.md`.
+
+## Preamble
+
+    EIP: <to be assigned> (I Suggest 20)
+    Title: <EIP title>
+    Author: Fabian Vogelsteller <fabian@ethereum.org>, Vitalik Buterin <vitalik.buterin@ethereum.org>
+    Type: Informational
+    Category ERC
+    Status: Draft
+    Created: 2015-11-19
+
+
+## Simple Summary
+
+Token standard interface.
+
+
+## Abstract
+
+The following standard allows for people to implement a token standard API withing their smart contracts.
+
+This standard provides basic functionality for sending and approving tokens to be spend by a third party.
+
+
+## Motivation
+
+Following the same standard interface allows those tokens to be used in many wallets and exchanges.
+
+
+## Specification
+
+## Token
+### Methods
+
+**NOTE**: An important point is that callers should handle `false` from `returns (bool success)`.  Callers should not assume that `false` is never returned!
+
+#### totalSupply
+
+``` js
+function totalSupply() constant returns (uint256 totalSupply)
+```
+
+Get the total token supply
+#### balanceOf
+
+``` js
+function balanceOf(address _owner) constant returns (uint256 balance)
+```
+
+Get the account balance of another account with address `_owner`
+#### transfer
+
+``` js
+function transfer(address _to, uint256 _value) returns (bool success)
+```
+
+Send `_value` amount of tokens to address `_to`
+#### transferFrom
+
+``` js
+function transferFrom(address _from, address _to, uint256 _value) returns (bool success)
+```
+
+Send `_value` amount of tokens from address `_from` to address `_to`
+
+The `transferFrom` method is used for a withdraw workflow, allowing contracts to send tokens on your behalf, for example to "deposit" to a contract address and/or to charge fees in sub-currencies; the command should fail unless the `_from` account has deliberately authorized the sender of the message via some mechanism; we propose these standardized APIs for approval:
+#### approve
+
+``` js
+function approve(address _spender, uint256 _value) returns (bool success)
+```
+
+Allow _spender to withdraw from your account, multiple times, up to the _value amount. If this function is called again it overwrites the current allowance with _value.
+To prevent attack vectors like described here: https://docs.google.com/document/d/1YLPtQxZu1UAvO9cZ1O2RPXBbT0mooh4DYKjA_jp-RLM/
+make sure to set the allowance to 0 before setting it to another value for the same spender.
+#### allowance
+
+``` js
+function allowance(address _owner, address _spender) constant returns (uint256 remaining)
+```
+
+Returns the amount which `_spender` is still allowed to withdraw from `_owner`
+### Events
+#### Transfer
+
+``` js
+event Transfer(address indexed _from, address indexed _to, uint256 _value)
+```
+
+Triggered when tokens are transferred.
+#### Approval
+
+``` js
+event Approval(address indexed _owner, address indexed _spender, uint256 _value)
+```
+
+Triggered whenever `approve(address _spender, uint256 _value)` is called.
+
+
+## Implementation
+
+Different implementations are available at
+- https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/token/StandardToken.sol
+- https://github.com/ConsenSys/Tokens/blob/master/Token_Contracts/contracts/StandardToken.sol
+
+Implentation adding the force 0 before calling approve again:
+- https://github.com/Giveth/minime/blob/master/MiniMeToken.sol
+
+## Copyright
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).