Abstract
The following describes standard functions a wallet contract can implement.
Motivation
Those will allow dapps and wallets to handle tokens across multiple interfaces/dapps/eoa.
The most important here are, transfer, ‘transferOwnership’,balanceOf , approve and the Transferevent,the ‘approve’ event.
Specification
Wallet
Methods
NOTE: An important point is that callers should handle false from returns (bool success). Callers should not assume that false is never returned!
balanceOf
function balanceOf(address _token) constant returns (uint256 balance)
Get the account balance of token address _token
balanceOf
function balanceOf() constant returns (uint256 balance)
Get the account balance of ETH
transfer
function transfer(address _to, uint256 _value,address _token) returns (bool success)
Send _value amount of tokens to address _to with token address ‘_token’
transferFrom
function transferFrom(address _from, address _to, uint256 _value,address _token) 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
function approve(address _spender, uint256 _value,address _token) 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.
transferOwnership
function transferOwnership(address _owner) constant returns (bool success)
transfer wallet ownership,called by owner only normally,called by guardian when all guardians report wallet lost and owner can revoke it.
guardian
function guardian(address _guardian) constant returns (bool success)
set wallet guardian,called by owner only.
####lost
function lost() constant returns (bool success)
report wallet lost when owner disabled,called by guardian only.
Events
Transfer
event Transfer(address indexed _from, address indexed _to, uint256 _value)
Triggered when token/eth are transferred.
Approval
event Approval(address indexed _owner, address indexed _spender, uint256 _value,address _token)
Triggered whenever approve(address _spender, uint256 _value,address _token) is called.