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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.
A standard interface for tokens.
## 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.
The following standard allows for the implementation of a standard API for tokens within their smart contracts:
it primarily provides basic functionality to transfer tokens and allow them to be approved to be spend by another on-chain third party.
## Motivation
Following the same standard interface allows those tokens to be used in many wallets and exchanges.
A standard interface allows any tokens on Ethereum to be re-used by other applications: from wallets to decentralized exchanges.
## Specification
@ -61,7 +55,7 @@ Get the account balance of another account with address `_owner`
function transfer(address _to, uint256 _value) returns (bool success)
```
Send `_value` amount of tokens to address `_to`
Transfer `_value` amount of tokens to address `_to`
#### transferFrom
@ -82,7 +76,7 @@ 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/
To prevent attack vectors like the one 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.
@ -118,11 +112,14 @@ Triggered whenever `approve(address _spender, uint256 _value)` is called.
## Implementation
Different implementations are available at
There are already plenty of ERC20-compliant tokens deployed on the Ethereum network and is the most widely used standard.
Different implementations have been written by various teams that have different trade-offs: from gas saving to improved security.
#### Example 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:
#### Implementation adding the force 0 before calling approve again:
- https://github.com/Giveth/minime/blob/master/MiniMeToken.sol
## Copyright