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jim380/transferProxy()

Created August 18, 2018 21:12
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transferProxy() snippet
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transferProxy()
function transferProxy(address _from, address _to, uint256 _value, uint256 _fee,
uint8 _v, bytes32 _r, bytes32 _s) public returns (bool){
if(balances[_from] < _fee + _value || _fee > _fee + _value) revert();
uint256 nonce = nonces[_from];
bytes32 h = keccak256(_from,_to,_value,_fee,nonce);
if(_from != ecrecover(h,_v,_r,_s)) revert();
if(balances[_to] + _value < balances[_to]
|| balances[msg.sender] + _fee < balances[msg.sender]) revert();
balances[_to] += _value;
emit Transfer(_from, _to, _value);
balances[msg.sender] += _fee;
emit Transfer(_from, msg.sender, _fee);
balances[_from] -= _value + _fee;
nonces[_from] = nonce + 1;
return true;
}
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